Network Working Group S. Perreault Internet-Draft Viagenie Obsoletes: 4008 (if approved) T. Tsou Intended status: Standards Track Huawei Technologies Expires: March 8, 2012 September 5, 2011 Definitions of Managed Objects for Network Address Translators (NAT) draft-perreault-opsawg-natmib-bis-00 Abstract This memo defines a portion of the Management Information Base (MIB) for devices implementing Network Address Translator (NAT) function. This MIB module may be used for configuration as well as monitoring of a device capable of NAT function. This memo is a revision of the previous NAT-MIB [RFC4008] to take into account new types of NAT. Status of This Memo This Internet-Draft is submitted to IETF in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet- Drafts. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt. The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. This Internet-Draft will expire on March 8, 2012. Copyright Notice Copyright (c) 2011 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents Perreault & Tsou Expires March 8, 2012 [Page 1] Internet-Draft NAT-MIB-bis September 2011 (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Changes from RFC4008 . . . . . . . . . . . . . . . . . . . . . 3 3. The Internet-Standard Management Framework . . . . . . . . . . 4 4. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4 5. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 5.1. natInterfaceTable . . . . . . . . . . . . . . . . . . . . 6 5.2. natAddrMapTable . . . . . . . . . . . . . . . . . . . . . 6 5.3. Default Timeouts, Protocol Table, and Other Scalars . . . 7 5.4. natAddrBindTable and natAddrPortBindTable . . . . . . . . 7 5.5. natSessionTable . . . . . . . . . . . . . . . . . . . . . 8 5.6. RFC 3489 NAPT Variations, NAT Session and Bind Tables . . 8 5.7. Notifications . . . . . . . . . . . . . . . . . . . . . . 9 5.8. Notifications . . . . . . . . . . . . . . . . . . . . . . 9 5.9. Configuration via the MIB . . . . . . . . . . . . . . . . 10 5.10. Relationship to Interface MIB . . . . . . . . . . . . . . 10 6. Definitions . . . . . . . . . . . . . . . . . . . . . . . . . 11 7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 68 8. Security Considerations . . . . . . . . . . . . . . . . . . . 68 9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 70 10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 70 10.1. Normative References . . . . . . . . . . . . . . . . . . . 70 10.2. Informative References . . . . . . . . . . . . . . . . . . 71 Perreault & Tsou Expires March 8, 2012 [Page 2] Internet-Draft NAT-MIB-bis September 2011 1. Introduction This memo defines a portion of the Management Information Base (MIB) for devices implementing NAT function. This MIB module may be used for configuration and monitoring of a device capable of NAT function. NAT types and their characteristics are defined in [RFC2663]. Traditional NAT function, in particular is defined in [RFC3022]. This MIB does not address the firewall functions and must not be used for configuring or monitoring these. Section 3 provides references to the SNMP management framework, which was used as the basis for the MIB module definition. Section 4 describes the terms used throughout the document. Section 5 provides an overview of the key objects, their inter-relationship, and how the MIB module may be used to configure and monitor a NAT device. Lastly, Section 6 has the complete NAT MIB definition. The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119]. 2. Changes from RFC4008 TODO: Move this section to an appendix after initial reviews. o Address pools can now be shared between multiple interfaces. This change makes this MIB applicable to DS-Lite's AFTR [RFC6333]. See [draft-schoenw-behave-nat-mib-bis-00] for rationale. o TODO: Merge CGN stuff from draft-jpdionne-behave-cgn-mib. o TODO: Merge NAT64 stuff from draft-jpdionne-behave-nat64-mib. o TODO: Update to RFC 4787 terminology for describing NAT behavior. o TODO: Support protocols other than UDP and TCP. o TODO: Add support to limit and/or throttle binding allocations. o TODO: Clarify existing notifications (e.g., natPacketDiscard) and add any additional notifications that may be needed for binding limits / binding throttling. o TODO: Are we missing anything for PCP support? (time-limited static entries) o TODO: Include (for example in an appendix) a description plus examples how the revised NAT-MIB can be used by NAT64 implementations, CGNs, and DS- Lite implementations. Perreault & Tsou Expires March 8, 2012 [Page 3] Internet-Draft NAT-MIB-bis September 2011 3. The Internet-Standard Management Framework For a detailed overview of the documents that describe the current Internet-Standard Management Framework, please refer to section 7 of [RFC3410]. Managed objects are accessed via a virtual information store, termed the Management Information Base or MIB. MIB objects are generally accessed through the Simple Network Management Protocol (SNMP). Objects in the MIB are defined using the mechanisms defined in the Structure of Management Information (SMI). This memo specifies a MIB module that is compliant to the SMIv2, which is described in STD 58, RFC 2578 [RFC2578], STD 58, RFC 2579 [RFC2579] and STD 58, RFC 2580 [RFC2580]. 4. Terminology [To be Reviewed] Definitions for a majority of the terms used throughout the document may be found in [RFC2663]. Additional terms that further classify NAPT implementations are defined in [RFC3489]. Listed below are terms used in this document. Address realm - An address realm is a realm of unique network addresses that are routable within the realm. For example, an enterprise address realm could be constituted of private IP addresses in the ranges specified in [RFC1918], which are routable within the enterprise, but not across the Internet. A public realm is constituted of globally unique network addresses. Symmetric NAT - Symmetric NAT, as defined in [RFC3489], is a variation of Network Address Port Translator (NAPT). Symmetric NAT does not use port bind for translation across all sessions originating from the same private host. Instead, it assigns a new public port to each new session, irrespective of whether the new session used the same private end-point as before. Bind or Binding - Several variations of the term 'Bind' (or 'Binding') are used throughout the document. Address Bind (or Address Binding) is a tuple of (Private IP address, Public IP Address) used for translating an IP address end-point in IP packets. Port Bind (or, Port Binding, or Address Port Bind, or Address Port Binding) is a tuple of (transport protocol, Private IP address, Private port, Public IP Address, Public port) used for translating a port end-point tuple of (transport protocol, IP address, port). Bind is used to refer to either Address Bind or Port Bind. Bind Mode identifies whether a bind is Address Bind or Port Bind. Perreault & Tsou Expires March 8, 2012 [Page 4] Internet-Draft NAT-MIB-bis September 2011 NAT Session - A NAT session is an association between a session as seen in the private realm and a session as seen in the public realm, by virtue of NAT translation. If a session in the private realm were to be represented as (PrivateSrcAddr, PrivateDstAddr, TransportProtocol, PrivateSrcPort, PrivateDstPort) and the same session in the public realm were to be represented as (PublicSrcAddr, PublicDstAddr, TransportProtocol, PublicSrcPort, PublicDstPort), the NAT session will provide the translation glue between the two session representations. NAT sessions in the document are restricted to sessions based on TCP and UDP only. In the future, NAT sessions may be extended to be based on other transport protocols such as SCTP, UDP-lite and DCCP. The terms 'local' and 'private' are used interchangeably throughout the document when referring to private networks, IP addresses, and ports. Likewise, the terms 'global' and 'public' are used interchangeably when referring to public networks, IP addresses, and ports. 5. Overview NAT MIB is configurable on a per-interface basis and depends in several parts on the IF-MIB [RFC2863]. NAT MIB requires that an interface for which NAT is configured be connected to either a private or a public realm. The realm association of the interface plays an important role in the definition of address maps for the interface. An address map entry identifies the orientation of the session (inbound or outbound to the interface) for which the entry may be used for NAT translation. The address map entry also identifies the end-point of the session that must be subject to translation. An SNMP Textual-Convention 'NatTranslationEntity' is defined to capture this important characteristic that combines session orientation and applicable session endpoint for translation. An address map may consist of static or dynamic entries. NAT creates static binds from a static address map entry. Each static bind has a direct one-to-one relationship with a static address map entry. NAT creates dynamic binds from a dynamic address map entry upon seeing the first packet of a new session. The following subsections define the key objects used in NAT MIB, their inter-relationship, and how to configure a NAT device using the MIB module. Perreault & Tsou Expires March 8, 2012 [Page 5] Internet-Draft NAT-MIB-bis September 2011 5.1. natInterfaceTable [To be reviewed] natInterfaceTable is defined in the MIB module to configure interface specific realm type and the NAT services enabled for the interface. natInterfaceTable is indexed by ifIndex and also includes interface specific NAT statistics. The first step for an operator in configuring a NAT device is determining the interface over which NAT service is to be configured. When NAT service is operational, translated packets traverse the NAT device by ingressing on a private interface and egressing on a public interface or vice versa. An operator may configure the NAT service on either the public interface or the private interface in the traversal path. As the next step, the operator must identify the NAT service(s) desired for the interface. The operator may configure one or more NAT services on the same interface. The MIB module identifies four types of NAT services: Basic NAT, NAPT, twice NAT and bidirectional NAT. These are NAT varieties as defined in [RFC2663]. Note that [RFC3489] further classifies NAPT implementations based on the behavior exhibited by the NAPT devices from different vendors. However, the MIB module does not explicitly distinguish between the NAPT implementations. NAPT implementations may be distinguished between one another by monitoring the BIND and NAT Session objects generated by the NAT device as described in section Section 5.6. 5.2. natAddrMapTable [To be reviewed] natAddrMapTable is defined in the MIB module to configure address maps on a per-interface basis. natAddrMapTable is indexed by the tuple of (ifIndex, natAddrMapIndex). The same table is also used to collect Statistics for the address map entries. Address maps are key to NAT configuration. An operator may configure one or more address map entries per interface. NAT looks up address map entries in the order in which they are defined to determine the translation function at the start of each new session traversing the interface. An address map may consist of static or dynamic entries. A static address map entry has a direct one-to-one relationship with binds. NAT will dynamically create binds from a dynamic address map entry. The operator must be careful in selecting address map entries for an interface based on the interface realm-type and the type of NAT service desired. The operator can be amiss in the selection of Perreault & Tsou Expires March 8, 2012 [Page 6] Internet-Draft NAT-MIB-bis September 2011 address map entries when not paying attention to the associated interface characteristics defined in natInterfaceTable (described in section 4.1). For example, say the operator wishes to configure a NAPT map entry on an interface of a NAT device. If the operator chooses to configure the NAPT map entry on a public interface (i.e., interface realm-type is public), the operator should set the TranslationEntity of the NAPT address map entry to be outboundSrcEndPoint. On the other hand, if the operator chooses to configure the NAPT map entry on a private interface (i.e., interface realm-type is private), the operator should set the TranslationEntity of the NAPT address map entry to be InboundSrcEndPoint. 5.3. Default Timeouts, Protocol Table, and Other Scalars [To be reviewed] DefTimeouts is defined in the MIB module to configure idle Bind timeout and IP protocol specific idle NAT session timeouts. The timeouts defined are global to the system and are not interface specific. Protocol specific statistics are maintained in natProtocolTable, which is indexed by the protocol type. The scalars natAddrBindNumberOfEntries and natAddrPortBindNumberOfEntries hold the number of entries that currently exist in the Address Bind and the Address Port Bind tables, respectively. The generation of natPacketDiscard notifications can be configured by using the natNotifThrottlingInterval scalar MIB object. 5.4. natAddrBindTable and natAddrPortBindTable [To be reviewed] Two Bind tables, natAddrBindTable and natAddrPortBindTable, are defined to hold the bind entries. Entries are derived from the address map table and are not configurable. natAddrBindTable contains Address Binds, and natAddrPortBindTable contains Address Port Binds. natAddrBindTable is indexed by the tuple of (ifIndex, LocalAddrType, LocalAddr). natAddrPortBindTable is indexed by the tuple of (ifIndex, LocalAddrType, LocalAddr, LocalPort, Protocol). These tables also maintain bind specific statistics. A Symmetric NAT will have no entries in the Bind tables. Perreault & Tsou Expires March 8, 2012 [Page 7] Internet-Draft NAT-MIB-bis September 2011 5.5. natSessionTable [To be reviewed] natSessionTable is defined to hold NAT session entries. NAT session entries are derived from NAT Binds (except in the case of Symmetric NAT) and are not configurable. The NAT session provides the necessary translation glue between two session representations of the same end-to-end session; that is, a session as seen in the private realm and in the public realm. Session orientation (inbound or outbound) is determined from the orientation of the first packet traversing the NAT interface. Address map entries and bind entries on the interface determine whether a session is subject to NAT translation. One or both endpoints of a session may be subject to translation. With the exception of symmetric NAT, all other NAT functions use end- point specific bind to perform individual end-point translations. Multiple NAT sessions would use the same bind as long as they share the same endpoint. Symmetric NAT does not retain a consistent port bind across multiple sessions using the same endpoint. For this reason, the bind identifier for a NAT session in symmetric NAT is set to zero. natSessionTable is indexed by the tuple of (ifIndex, natSessionIndex). Statistics for NAT sessions are also maintained in the same table. 5.6. RFC 3489 NAPT Variations, NAT Session and Bind Tables [To be reviewed, translate to new terminology] [RFC3489] defines four variations of NAPT - Full Cone, Restricted Cone, Port Restricted Cone, and Symmetric NAT. These can be differentiated in the NAT MIB based on different values for the objects in the session and the bind tables, as indicated below. In a Port Restricted Cone NAT, NAT Session objects will contain a non-zero PrivateSrcEPBindId object. Further, all address and port objects within a NAT session will have non-zero values (i.e., no wildcard matches). An Address Restricted Cone NAT may have been implemented in the same way as a Port Restricted Cone NAT, except that the UDP NAT Sessions may use ANY match on PrivateDstPort and PublicDstPort objects; i.e., PrivateDstPort and PublicDstPort objects within a NAT session may be set to zero. A Full Cone NAT may have also been implemented in the same way as a Perreault & Tsou Expires March 8, 2012 [Page 8] Internet-Draft NAT-MIB-bis September 2011 Port Restricted Cone NAT, except that the UDP NAT Sessions may use ANY match on PrivateDstAddr, PrivateDstPort, PublicDstAddr, and PublicDstPort objects. Within a NAT Session, all four of these objects may be set to zero. Alternately, all address and port objects within a NAT Session may have non-zero values, yet the TranslationEntity of the PrivateSrcEPBindId for the NAT Sessions may be set bi-directionally, i.e., as a bit mask of (outboundSrcEndPoint and inboundDstEndPoint) or (inboundSrcEndPoint and outboundDstEndPoint), depending on the interface realm type. Lastly, a Symmetric NAT does not maintain Port Bindings. As such, the NAT Session objects will have the PrivateSrcEPBindId set to zero. 5.7. Notifications [To be reviewed] natPacketDiscard notifies the end user/manager of packets being discarded due to lack of address mappings. [Port exhaustion, CGN-MIB?] 5.8. Notifications [To be reviewed] The association between the various NAT tables can be represented as follows: Interface | | | Address map | | | ---------------------------------------------- | | | | | | Address Bind Port Bind | | | | | | ---------------------------------------------- | | | Perreault & Tsou Expires March 8, 2012 [Page 9] Internet-Draft NAT-MIB-bis September 2011 NAT Session All NAT functions, with the exception of Symmetric NAT, use Bind(s) to provide the glue necessary for a NAT Session. natSessionPrivateSrcEPBindId and natSessionPrivateDstEPBindId objects represent the endpoint Binds used by NAT Sessions. 5.9. Configuration via the MIB [To be reviewed] Section 5.1, and Section 5.2 and part of Section 5.3 refer to objects that are configurable on a NAT device. NAT derives Address Bind and Address Port Bind entries from the Address Map table. Hence, an Address Bind or an Address Port Bind entry must not exist without an associated entry in the Address Map table. Further, NAT derives NAT session entries from NAT Binds, except in the case of symmetric NAT, which derives translation parameters for a NAT session directly from an address map entry. Hence, with the exception of Symmetric NAT, a NAT session entry must not exist in the NAT Session table without a corresponding bind. A Management station may use the following steps to configure entries in the NAT-MIB: o Create an entry in the natInterfaceTable specifying the value of ifIndex as the interface index of the interface on which NAT is being configured. Specify appropriate values, as applicable, for the other objects (e.g., natInterfaceRealm, natInterfaceServiceType) in the table (refer to Section 5.1). o Create one or more address map entries sequentially in reduced order of priority in the natAddrMapTable, specifying the value of ifIndex to be the same for all entries. The ifIndex specified would be the same as that specified for natInterfaceTable (refer to Section 5.2). o Configure the maximum permitted idle time duration for BINDs and TCP, UDP, and ICMP protocol sessions by setting the relevant scalars in natDefTimeouts object (refer to Section 5.3). 5.10. Relationship to Interface MIB [To be reviewed, relationship to other MIB?] The natInterfaceTable specifies the NAT configuration attributes on each interface. The concept of "interface" is as defined by Perreault & Tsou Expires March 8, 2012 [Page 10] Internet-Draft NAT-MIB-bis September 2011 InterfaceIndex/ifIndex of the IETF Interfaces MIB [RFC2863]. 6. Definitions This MIB module IMPORTs objects from [RFC2578], [RFC2579], [RFC2580], [RFC2863], [RFC3411], and [RFC4001]. It also refers to information in [RFC0792], [RFC2463], and [RFC3413]. NAT-MIB DEFINITIONS ::= BEGIN IMPORTS MODULE-IDENTITY, OBJECT-TYPE, Integer32, Unsigned32, Gauge32, Counter64, TimeTicks, mib-2, NOTIFICATION-TYPE FROM SNMPv2-SMI TEXTUAL-CONVENTION, StorageType, RowStatus FROM SNMPv2-TC MODULE-COMPLIANCE, NOTIFICATION-GROUP, OBJECT-GROUP FROM SNMPv2-CONF ifIndex, ifCounterDiscontinuityGroup FROM IF-MIB SnmpAdminString FROM SNMP-FRAMEWORK-MIB InetAddressType, InetAddress, InetPortNumber FROM INET-ADDRESS-MIB; natMIB MODULE-IDENTITY LAST-UPDATED "YYYYMMDDhhmmZ" ORGANIZATION "IETF Transport Area" CONTACT-INFO " Simon Perreault Viagenie 2875 boul. Laurier, suite D2-630 Quebec Canada Perreault & Tsou Expires March 8, 2012 [Page 11] Internet-Draft NAT-MIB-bis September 2011 Phone: +1-418-656-9254 EMail: simon.perreault@viagenie.ca Tina Tsou Huawei Technologies 2330 Central Expressway Santa Clara USA Phone: +1-408-330-4424 EMail: tena@huawei.com " DESCRIPTION "This MIB module defines the generic managed objects for NAT. Copyright (C) The Internet Society (YYYY). This version of this MIB module is part of RFC XXXX; see the RFC itself for full legal notices." REVISION "200503210000Z" -- 21th March 2005 DESCRIPTION "Initial version, published as RFC 4008." REVISION "YYYYMMDDhhmmZ" DESCRIPTION "Second version, published as RFC XXXX." ::= { mib-2 123 } natMIBObjects OBJECT IDENTIFIER ::= { natMIB 1 } NatProtocolType ::= TEXTUAL-CONVENTION STATUS current DESCRIPTION "A list of protocols that support the network address translation. Inclusion of the values is not intended to imply that those protocols need to be supported. Any change in this TEXTUAL-CONVENTION should also be reflected in the definition of NatProtocolMap, which is a BITS representation of this." SYNTAX INTEGER { none (1), -- not specified other (2), -- none of the following icmp (3), udp (4), tcp (5) } NatProtocolMap ::= TEXTUAL-CONVENTION Perreault & Tsou Expires March 8, 2012 [Page 12] Internet-Draft NAT-MIB-bis September 2011 STATUS current DESCRIPTION "A bitmap of protocol identifiers that support the network address translation. Any change in this TEXTUAL-CONVENTION should also be reflected in the definition of NatProtocolType." SYNTAX BITS { other (0), icmp (1), udp (2), tcp (3) } NatAddrMapId ::= TEXTUAL-CONVENTION DISPLAY-HINT "d" STATUS current DESCRIPTION "A unique id that is assigned to each address map by a NAT enabled device." SYNTAX Unsigned32 (1..4294967295) NatSharedAddrMapId ::= TEXTUAL-CONVENTION DISPLAY-HINT "d" STATUS current DESCRIPTION "A unique id that is assigned to each shared address map by a NAT enabled device." SYNTAX Unsigned32 (1..4294967295) NatBindIdOrZero ::= TEXTUAL-CONVENTION DISPLAY-HINT "d" STATUS current DESCRIPTION "A unique id that is assigned to each bind by a NAT enabled device. The bind id will be zero in the case of a Symmetric NAT." SYNTAX Unsigned32 (0..4294967295) NatBindId ::= TEXTUAL-CONVENTION DISPLAY-HINT "d" STATUS current DESCRIPTION "A unique id that is assigned to each bind by a NAT enabled device." SYNTAX Unsigned32 (1..4294967295) NatSessionId ::= TEXTUAL-CONVENTION DISPLAY-HINT "d" Perreault & Tsou Expires March 8, 2012 [Page 13] Internet-Draft NAT-MIB-bis September 2011 STATUS current DESCRIPTION "A unique id that is assigned to each session by a NAT enabled device." SYNTAX Unsigned32 (1..4294967295) NatBindMode ::= TEXTUAL-CONVENTION STATUS current DESCRIPTION "An indication of whether the bind is an address bind or an address port bind." SYNTAX INTEGER { addressBind (1), addressPortBind (2) } NatAssociationType ::= TEXTUAL-CONVENTION STATUS current DESCRIPTION "An indication of whether the association is static or dynamic." SYNTAX INTEGER { static (1), dynamic (2) } NatTranslationEntity ::= TEXTUAL-CONVENTION STATUS current DESCRIPTION "An indication of a) the direction of a session for which an address map entry, address bind or port bind is applicable, and b) the entity (source or destination) within the session that is subject to translation." SYNTAX BITS { inboundSrcEndPoint (0), outboundDstEndPoint(1), inboundDstEndPoint (2), outboundSrcEndPoint(3) } -- -- Default Values for the Bind and NAT Protocol Timers -- natDefTimeouts OBJECT IDENTIFIER ::= { natMIBObjects 1 } natNotifCtrl OBJECT IDENTIFIER ::= { natMIBObjects 2 } Perreault & Tsou Expires March 8, 2012 [Page 14] Internet-Draft NAT-MIB-bis September 2011 -- -- Address Bind and Port Bind related NAT configuration -- natBindDefIdleTimeout OBJECT-TYPE SYNTAX Unsigned32 (0..4294967295) UNITS "seconds" MAX-ACCESS read-write STATUS current DESCRIPTION "The default Bind (Address Bind or Port Bind) idle timeout parameter. If the agent is capable of storing non-volatile configuration, then the value of this object must be restored after a re-initialization of the management system." DEFVAL { 0 } ::= { natDefTimeouts 1 } -- -- UDP related NAT configuration -- natUdpDefIdleTimeout OBJECT-TYPE SYNTAX Unsigned32 (1..4294967295) UNITS "seconds" MAX-ACCESS read-write STATUS current DESCRIPTION "The default UDP idle timeout parameter. If the agent is capable of storing non-volatile configuration, then the value of this object must be restored after a re-initialization of the management system." DEFVAL { 300 } ::= { natDefTimeouts 2 } -- -- ICMP related NAT configuration -- natIcmpDefIdleTimeout OBJECT-TYPE SYNTAX Unsigned32 (1..4294967295) UNITS "seconds" MAX-ACCESS read-write STATUS current Perreault & Tsou Expires March 8, 2012 [Page 15] Internet-Draft NAT-MIB-bis September 2011 DESCRIPTION "The default ICMP idle timeout parameter. If the agent is capable of storing non-volatile configuration, then the value of this object must be restored after a re-initialization of the management system." DEFVAL { 300 } ::= { natDefTimeouts 3 } -- -- Other protocol parameters -- natOtherDefIdleTimeout OBJECT-TYPE SYNTAX Unsigned32 (1..4294967295) UNITS "seconds" MAX-ACCESS read-write STATUS current DESCRIPTION "The default idle timeout parameter for protocols represented by the value other (2) in NatProtocolType. If the agent is capable of storing non-volatile configuration, then the value of this object must be restored after a re-initialization of the management system." DEFVAL { 60 } ::= { natDefTimeouts 4 } -- -- TCP related NAT Timers -- natTcpDefIdleTimeout OBJECT-TYPE SYNTAX Unsigned32 (1..4294967295) UNITS "seconds" MAX-ACCESS read-write STATUS current DESCRIPTION "The default time interval that a NAT session for an established TCP connection is allowed to remain valid without any activity on the TCP connection. If the agent is capable of storing non-volatile configuration, then the value of this object must be restored after a re-initialization of the management Perreault & Tsou Expires March 8, 2012 [Page 16] Internet-Draft NAT-MIB-bis September 2011 system." DEFVAL { 86400 } ::= { natDefTimeouts 5 } natTcpDefNegTimeout OBJECT-TYPE SYNTAX Unsigned32 (1..4294967295) UNITS "seconds" MAX-ACCESS read-write STATUS current DESCRIPTION "The default time interval that a NAT session for a TCP connection that is not in the established state is allowed to remain valid without any activity on the TCP connection. If the agent is capable of storing non-volatile configuration, then the value of this object must be restored after a re-initialization of the management system." DEFVAL { 60 } ::= { natDefTimeouts 6 } natNotifThrottlingInterval OBJECT-TYPE SYNTAX Integer32 (0 | 5..3600) UNITS "seconds" MAX-ACCESS read-write STATUS current DESCRIPTION "This object controls the generation of the natPacketDiscard notification. If this object has a value of zero, then no natPacketDiscard notifications will be transmitted by the agent. If this object has a non-zero value, then the agent must not generate more than one natPacketDiscard 'notification-event' in the indicated period, where a 'notification-event' is the generation of a single notification PDU type to a list of notification destinations. If additional NAT packets are discarded within the throttling period, then notification-events for these changes must be suppressed by the agent until the current throttling period expires. If natNotifThrottlingInterval notification generation is enabled, the suggested default throttling period is 60 seconds, but generation of the natPacketDiscard Perreault & Tsou Expires March 8, 2012 [Page 17] Internet-Draft NAT-MIB-bis September 2011 notification should be disabled by default. If the agent is capable of storing non-volatile configuration, then the value of this object must be restored after a re-initialization of the management system. The actual transmission of notifications is controlled via the MIB modules in RFC 3413." DEFVAL { 0 } ::= { natNotifCtrl 1 } -- -- The NAT Interface Table -- natInterfaceTable OBJECT-TYPE SYNTAX SEQUENCE OF NatInterfaceEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "This table specifies the attributes for interfaces on a device supporting NAT function." ::= { natMIBObjects 3 } natInterfaceEntry OBJECT-TYPE SYNTAX NatInterfaceEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "Each entry in the natInterfaceTable holds a set of parameters for an interface, instantiated by ifIndex. Therefore, the interface index must have been assigned, according to the applicable procedures, before it can be meaningfully used. Generally, this means that the interface must exist. When natStorageType is of type nonVolatile, however, this may reflect the configuration for an interface whose ifIndex has been assigned but for which the supporting implementation is not currently present." INDEX { ifIndex } ::= { natInterfaceTable 1 } NatInterfaceEntry ::= SEQUENCE { natInterfaceRealm INTEGER, natInterfaceServiceType BITS, natInterfaceInTranslates Counter64, Perreault & Tsou Expires March 8, 2012 [Page 18] Internet-Draft NAT-MIB-bis September 2011 natInterfaceOutTranslates Counter64, natInterfaceDiscards Counter64, natInterfaceStorageType StorageType, natInterfaceRowStatus RowStatus, natInterfaceSharedAddrMapIndex NatSharedAddrMapId } natInterfaceRealm OBJECT-TYPE SYNTAX INTEGER { private (1), public (2) } MAX-ACCESS read-create STATUS current DESCRIPTION "This object identifies whether this interface is connected to the private or the public realm." DEFVAL { public } ::= { natInterfaceEntry 1 } natInterfaceServiceType OBJECT-TYPE SYNTAX BITS { basicNat (0), napt (1), bidirectionalNat (2), twiceNat (3) } MAX-ACCESS read-create STATUS current DESCRIPTION "An indication of the direction in which new sessions are permitted and the extent of translation done within the IP and transport headers." ::= { natInterfaceEntry 2 } natInterfaceInTranslates OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "Number of packets received on this interface that were translated. Discontinuities in the value of this counter can occur at reinitialization of the management system and at other times as indicated by the value of ifCounterDiscontinuityTime on the relevant interface." ::= { natInterfaceEntry 3 } Perreault & Tsou Expires March 8, 2012 [Page 19] Internet-Draft NAT-MIB-bis September 2011 natInterfaceOutTranslates OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "Number of translated packets that were sent out this interface. Discontinuities in the value of this counter can occur at reinitialization of the management system and at other times as indicated by the value of ifCounterDiscontinuityTime on the relevant interface." ::= { natInterfaceEntry 4 } natInterfaceDiscards OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "Number of packets that had to be rejected/dropped due to a lack of resources for this interface. Discontinuities in the value of this counter can occur at reinitialization of the management system and at other times as indicated by the value of ifCounterDiscontinuityTime on the relevant interface." ::= { natInterfaceEntry 5 } natInterfaceStorageType OBJECT-TYPE SYNTAX StorageType MAX-ACCESS read-create STATUS current DESCRIPTION "The storage type for this conceptual row. Conceptual rows having the value 'permanent' need not allow write-access to any columnar objects in the row." REFERENCE "Textual Conventions for SMIv2, Section 2." DEFVAL { nonVolatile } ::= { natInterfaceEntry 6 } natInterfaceRowStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "The status of this conceptual row. Perreault & Tsou Expires March 8, 2012 [Page 20] Internet-Draft NAT-MIB-bis September 2011 Until instances of all corresponding columns are appropriately configured, the value of the corresponding instance of the natInterfaceRowStatus column is 'notReady'. In particular, a newly created row cannot be made active until the corresponding instance of natInterfaceServiceType has been set. None of the objects in this row may be modified while the value of this object is active(1)." REFERENCE "Textual Conventions for SMIv2, Section 2." ::= { natInterfaceEntry 7 } natInterfaceSharedAddrMapIndex OBJECT-TYPE SYNTAX NatSharedAddrMapId MAX-ACCESS not-accessible STATUS current DESCRIPTION "Link to a NatSharedAddrMapEntry. If NULL, it is expected that there exist at least one NatAddrMapEntry pointing to this interface entry." ::= { natInterfaceEntry 8 } -- -- The Address Map Table -- natAddrMapTable OBJECT-TYPE SYNTAX SEQUENCE OF NatAddrMapEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "This table lists address map parameters for NAT." ::= { natMIBObjects 4 } natAddrMapEntry OBJECT-TYPE SYNTAX NatAddrMapEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "This entry represents an address map to be used for NAT and contributes to the dynamic and/or static address mapping tables of the NAT device." INDEX { ifIndex, natAddrMapIndex } Perreault & Tsou Expires March 8, 2012 [Page 21] Internet-Draft NAT-MIB-bis September 2011 ::= { natAddrMapTable 1 } NatAddrMapEntry ::= SEQUENCE { natAddrMapIndex NatAddrMapId, natAddrMapName SnmpAdminString, natAddrMapEntryType NatAssociationType, natAddrMapTranslationEntity NatTranslationEntity, natAddrMapLocalAddrType InetAddressType, natAddrMapLocalAddrFrom InetAddress, natAddrMapLocalAddrTo InetAddress, natAddrMapLocalPortFrom InetPortNumber, natAddrMapLocalPortTo InetPortNumber, natAddrMapGlobalAddrType InetAddressType, natAddrMapGlobalAddrFrom InetAddress, natAddrMapGlobalAddrTo InetAddress, natAddrMapGlobalPortFrom InetPortNumber, natAddrMapGlobalPortTo InetPortNumber, natAddrMapProtocol NatProtocolMap, natAddrMapInTranslates Counter64, natAddrMapOutTranslates Counter64, natAddrMapDiscards Counter64, natAddrMapAddrUsed Gauge32, natAddrMapStorageType StorageType, natAddrMapRowStatus RowStatus } natAddrMapIndex OBJECT-TYPE SYNTAX NatAddrMapId MAX-ACCESS not-accessible STATUS current DESCRIPTION "Along with ifIndex, this object uniquely identifies an entry in the natAddrMapTable. Address map entries are applied in the order specified by natAddrMapIndex." ::= { natAddrMapEntry 1 } natAddrMapName OBJECT-TYPE SYNTAX SnmpAdminString (SIZE(1..32)) MAX-ACCESS read-create STATUS current DESCRIPTION "Name identifying all map entries in the table associated with the same interface. All map entries with the same ifIndex MUST have the same map name." ::= { natAddrMapEntry 2 } natAddrMapEntryType OBJECT-TYPE Perreault & Tsou Expires March 8, 2012 [Page 22] Internet-Draft NAT-MIB-bis September 2011 SYNTAX NatAssociationType MAX-ACCESS read-create STATUS current DESCRIPTION "This parameter can be used to set up static or dynamic address maps." ::= { natAddrMapEntry 3 } natAddrMapTranslationEntity OBJECT-TYPE SYNTAX NatTranslationEntity MAX-ACCESS read-create STATUS current DESCRIPTION "The end-point entity (source or destination) in inbound or outbound sessions (i.e., first packets) that may be translated by an address map entry. Session direction (inbound or outbound) is derived from the direction of the first packet of a session traversing a NAT interface. NAT address (and Transport-ID) maps may be defined to effect inbound or outbound sessions. Traditionally, address maps for Basic NAT and NAPT are configured on a public interface for outbound sessions, effecting translation of source end-point. The value of this object must be set to outboundSrcEndPoint for those interfaces. Alternately, if address maps for Basic NAT and NAPT were to be configured on a private interface, the desired value for this object for the map entries would be inboundSrcEndPoint (i.e., effecting translation of source end-point for inbound sessions). If TwiceNAT were to be configured on a private interface, the desired value for this object for the map entries would be a bitmask of inboundSrcEndPoint and inboundDstEndPoint." ::= { natAddrMapEntry 4 } natAddrMapLocalAddrType OBJECT-TYPE SYNTAX InetAddressType MAX-ACCESS read-create STATUS current DESCRIPTION "This object specifies the address type used for natAddrMapLocalAddrFrom and natAddrMapLocalAddrTo." Perreault & Tsou Expires March 8, 2012 [Page 23] Internet-Draft NAT-MIB-bis September 2011 ::= { natAddrMapEntry 5 } natAddrMapLocalAddrFrom OBJECT-TYPE SYNTAX InetAddress MAX-ACCESS read-create STATUS current DESCRIPTION "This object specifies the first IP address of the range of IP addresses mapped by this translation entry. The value of this object must be less than or equal to the value of the natAddrMapLocalAddrTo object. The type of this address is determined by the value of the natAddrMapLocalAddrType object." ::= { natAddrMapEntry 6 } natAddrMapLocalAddrTo OBJECT-TYPE SYNTAX InetAddress MAX-ACCESS read-create STATUS current DESCRIPTION "This object specifies the last IP address of the range of IP addresses mapped by this translation entry. If only a single address is being mapped, the value of this object is equal to the value of natAddrMapLocalAddrFrom. For a static NAT, the number of addresses in the range defined by natAddrMapLocalAddrFrom and natAddrMapLocalAddrTo must be equal to the number of addresses in the range defined by natAddrMapGlobalAddrFrom and natAddrMapGlobalAddrTo. The value of this object must be greater than or equal to the value of the natAddrMapLocalAddrFrom object. The type of this address is determined by the value of the natAddrMapLocalAddrType object." ::= { natAddrMapEntry 7 } natAddrMapLocalPortFrom OBJECT-TYPE SYNTAX InetPortNumber MAX-ACCESS read-create STATUS current DESCRIPTION "If this conceptual row describes a Basic NAT address mapping, then the value of this object must be zero. If this conceptual row describes NAPT, then the value of this object specifies the first port number in the range of ports being mapped. The value of this object must be less than or equal to the Perreault & Tsou Expires March 8, 2012 [Page 24] Internet-Draft NAT-MIB-bis September 2011 value of the natAddrMapLocalPortTo object. If the translation specifies a single port, then the value of this object is equal to the value of natAddrMapLocalPortTo." DEFVAL { 0 } ::= { natAddrMapEntry 8 } natAddrMapLocalPortTo OBJECT-TYPE SYNTAX InetPortNumber MAX-ACCESS read-create STATUS current DESCRIPTION "If this conceptual row describes a Basic NAT address mapping, then the value of this object must be zero. If this conceptual row describes NAPT, then the value of this object specifies the last port number in the range of ports being mapped. The value of this object must be greater than or equal to the value of the natAddrMapLocalPortFrom object. If the translation specifies a single port, then the value of this object is equal to the value of natAddrMapLocalPortFrom." DEFVAL { 0 } ::= { natAddrMapEntry 9 } natAddrMapGlobalAddrType OBJECT-TYPE SYNTAX InetAddressType MAX-ACCESS read-create STATUS current DESCRIPTION "This object specifies the address type used for natAddrMapGlobalAddrFrom and natAddrMapGlobalAddrTo." ::= { natAddrMapEntry 10 } natAddrMapGlobalAddrFrom OBJECT-TYPE SYNTAX InetAddress MAX-ACCESS read-create STATUS current DESCRIPTION "This object specifies the first IP address of the range of IP addresses being mapped to. The value of this object must be less than or equal to the value of the natAddrMapGlobalAddrTo object. The type of this address is determined by the value of the natAddrMapGlobalAddrType object." ::= { natAddrMapEntry 11 } natAddrMapGlobalAddrTo OBJECT-TYPE Perreault & Tsou Expires March 8, 2012 [Page 25] Internet-Draft NAT-MIB-bis September 2011 SYNTAX InetAddress MAX-ACCESS read-create STATUS current DESCRIPTION "This object specifies the last IP address of the range of IP addresses being mapped to. If only a single address is being mapped to, the value of this object is equal to the value of natAddrMapGlobalAddrFrom. For a static NAT, the number of addresses in the range defined by natAddrMapGlobalAddrFrom and natAddrMapGlobalAddrTo must be equal to the number of addresses in the range defined by natAddrMapLocalAddrFrom and natAddrMapLocalAddrTo. The value of this object must be greater than or equal to the value of the natAddrMapGlobalAddrFrom object. The type of this address is determined by the value of the natAddrMapGlobalAddrType object." ::= { natAddrMapEntry 12 } natAddrMapGlobalPortFrom OBJECT-TYPE SYNTAX InetPortNumber MAX-ACCESS read-create STATUS current DESCRIPTION "If this conceptual row describes a Basic NAT address mapping, then the value of this object must be zero. If this conceptual row describes NAPT, then the value of this object specifies the first port number in the range of ports being mapped to. The value of this object must be less than or equal to the value of the natAddrMapGlobalPortTo object. If the translation specifies a single port, then the value of this object is equal to the value natAddrMapGlobalPortTo." DEFVAL { 0 } ::= { natAddrMapEntry 13 } natAddrMapGlobalPortTo OBJECT-TYPE SYNTAX InetPortNumber MAX-ACCESS read-create STATUS current DESCRIPTION "If this conceptual row describes a Basic NAT address mapping, then the value of this object must be zero. If this conceptual row describes NAPT, then the value of this object specifies the last port number in the range of ports being mapped to. Perreault & Tsou Expires March 8, 2012 [Page 26] Internet-Draft NAT-MIB-bis September 2011 The value of this object must be greater than or equal to the value of the natAddrMapGlobalPortFrom object. If the translation specifies a single port, then the value of this object is equal to the value of natAddrMapGlobalPortFrom." DEFVAL { 0 } ::= { natAddrMapEntry 14 } natAddrMapProtocol OBJECT-TYPE SYNTAX NatProtocolMap MAX-ACCESS read-create STATUS current DESCRIPTION "This object specifies a bitmap of protocol identifiers." ::= { natAddrMapEntry 15 } natAddrMapInTranslates OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of inbound packets pertaining to this address map entry that were translated. Discontinuities in the value of this counter can occur at reinitialization of the management system and at other times, as indicated by the value of ifCounterDiscontinuityTime on the relevant interface." ::= { natAddrMapEntry 16 } natAddrMapOutTranslates OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of outbound packets pertaining to this address map entry that were translated. Discontinuities in the value of this counter can occur at reinitialization of the management system and at other times, as indicated by the value of ifCounterDiscontinuityTime on the relevant interface." ::= { natAddrMapEntry 17 } natAddrMapDiscards OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION Perreault & Tsou Expires March 8, 2012 [Page 27] Internet-Draft NAT-MIB-bis September 2011 "The number of packets pertaining to this address map entry that were dropped due to lack of addresses in the address pool identified by this address map. The value of this object must always be zero in case of static address map. Discontinuities in the value of this counter can occur at reinitialization of the management system and at other times, as indicated by the value of ifCounterDiscontinuityTime on the relevant interface." ::= { natAddrMapEntry 18 } natAddrMapAddrUsed OBJECT-TYPE SYNTAX Gauge32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of addresses pertaining to this address map that are currently being used from the NAT pool. The value of this object must always be zero in the case of a static address map." ::= { natAddrMapEntry 19 } natAddrMapStorageType OBJECT-TYPE SYNTAX StorageType MAX-ACCESS read-create STATUS current DESCRIPTION "The storage type for this conceptual row. Conceptual rows having the value 'permanent' need not allow write-access to any columnar objects in the row." REFERENCE "Textual Conventions for SMIv2, Section 2." DEFVAL { nonVolatile } ::= { natAddrMapEntry 20 } natAddrMapRowStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "The status of this conceptual row. Until instances of all corresponding columns are appropriately configured, the value of the corresponding instance of the natAddrMapRowStatus column is 'notReady'. Perreault & Tsou Expires March 8, 2012 [Page 28] Internet-Draft NAT-MIB-bis September 2011 None of the objects in this row may be modified while the value of this object is active(1)." REFERENCE "Textual Conventions for SMIv2, Section 2." ::= { natAddrMapEntry 21 } -- -- Address Bind section -- natAddrBindNumberOfEntries OBJECT-TYPE SYNTAX Gauge32 MAX-ACCESS read-only STATUS current DESCRIPTION "This object maintains a count of the number of entries that currently exist in the natAddrBindTable." ::= { natMIBObjects 5 } -- -- The NAT Address BIND Table -- natAddrBindTable OBJECT-TYPE SYNTAX SEQUENCE OF NatAddrBindEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "This table holds information about the currently active NAT BINDs." ::= { natMIBObjects 6 } natAddrBindEntry OBJECT-TYPE SYNTAX NatAddrBindEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "Each entry in this table holds information about an active address BIND. These entries are lost upon agent restart. This row has indexing which may create variables with more than 128 subidentifiers. Implementers of this table must be careful not to create entries that would result in OIDs which exceed the 128 subidentifier limit. Otherwise, the information cannot be accessed using SNMPv1, SNMPv2c or SNMPv3." Perreault & Tsou Expires March 8, 2012 [Page 29] Internet-Draft NAT-MIB-bis September 2011 INDEX { ifIndex, natAddrBindLocalAddrType, natAddrBindLocalAddr } ::= { natAddrBindTable 1 } NatAddrBindEntry ::= SEQUENCE { natAddrBindLocalAddrType InetAddressType, natAddrBindLocalAddr InetAddress, natAddrBindGlobalAddrType InetAddressType, natAddrBindGlobalAddr InetAddress, natAddrBindId NatBindId, natAddrBindTranslationEntity NatTranslationEntity, natAddrBindType NatAssociationType, natAddrBindMapIndex NatAddrMapId, natAddrBindSessions Gauge32, natAddrBindMaxIdleTime TimeTicks, natAddrBindCurrentIdleTime TimeTicks, natAddrBindInTranslates Counter64, natAddrBindOutTranslates Counter64 } natAddrBindLocalAddrType OBJECT-TYPE SYNTAX InetAddressType MAX-ACCESS not-accessible STATUS current DESCRIPTION "This object specifies the address type used for natAddrBindLocalAddr." ::= { natAddrBindEntry 1 } natAddrBindLocalAddr OBJECT-TYPE SYNTAX InetAddress MAX-ACCESS not-accessible STATUS current DESCRIPTION "This object represents the private-realm specific network layer address, which maps to the public-realm address represented by natAddrBindGlobalAddr. The type of this address is determined by the value of the natAddrBindLocalAddrType object." ::= { natAddrBindEntry 2 } natAddrBindGlobalAddrType OBJECT-TYPE SYNTAX InetAddressType MAX-ACCESS read-only STATUS current DESCRIPTION "This object specifies the address type used for natAddrBindGlobalAddr." Perreault & Tsou Expires March 8, 2012 [Page 30] Internet-Draft NAT-MIB-bis September 2011 ::= { natAddrBindEntry 3 } natAddrBindGlobalAddr OBJECT-TYPE SYNTAX InetAddress MAX-ACCESS read-only STATUS current DESCRIPTION "This object represents the public-realm network layer address that maps to the private-realm network layer address represented by natAddrBindLocalAddr. The type of this address is determined by the value of the natAddrBindGlobalAddrType object." ::= { natAddrBindEntry 4 } natAddrBindId OBJECT-TYPE SYNTAX NatBindId MAX-ACCESS read-only STATUS current DESCRIPTION "This object represents a bind id that is dynamically assigned to each bind by a NAT enabled device. Each bind is represented by a bind id that is unique across both, the natAddrBindTable and the natAddrPortBindTable." ::= { natAddrBindEntry 5 } natAddrBindTranslationEntity OBJECT-TYPE SYNTAX NatTranslationEntity MAX-ACCESS read-only STATUS current DESCRIPTION "This object represents the direction of sessions for which this bind is applicable and the endpoint entity (source or destination) within the sessions that is subject to translation using the BIND. Orientation of the bind can be a superset of translationEntity of the address map entry which forms the basis for this bind. For example, if the translationEntity of an address map entry is outboundSrcEndPoint, the translationEntity of a bind derived from this map entry may either be outboundSrcEndPoint or it may be bidirectional (a bitmask of outboundSrcEndPoint and inboundDstEndPoint)." ::= { natAddrBindEntry 6 } Perreault & Tsou Expires March 8, 2012 [Page 31] Internet-Draft NAT-MIB-bis September 2011 natAddrBindType OBJECT-TYPE SYNTAX NatAssociationType MAX-ACCESS read-only STATUS current DESCRIPTION "This object indicates whether the bind is static or dynamic." ::= { natAddrBindEntry 7 } natAddrBindMapIndex OBJECT-TYPE SYNTAX NatAddrMapId MAX-ACCESS read-only STATUS current DESCRIPTION "This object is a pointer to the natAddrMapTable entry (and the parameters of that entry) which was used in creating this BIND. This object, in conjunction with the ifIndex (which identifies a unique addrMapName) points to a unique entry in the natAddrMapTable." ::= { natAddrBindEntry 8 } natAddrBindSessions OBJECT-TYPE SYNTAX Gauge32 MAX-ACCESS read-only STATUS current DESCRIPTION "Number of sessions currently using this BIND." ::= { natAddrBindEntry 9 } natAddrBindMaxIdleTime OBJECT-TYPE SYNTAX TimeTicks MAX-ACCESS read-only STATUS current DESCRIPTION "This object indicates the maximum time for which this bind can be idle with no sessions attached to it. The value of this object is of relevance only for dynamic NAT." ::= { natAddrBindEntry 10 } natAddrBindCurrentIdleTime OBJECT-TYPE SYNTAX TimeTicks MAX-ACCESS read-only STATUS current DESCRIPTION "At any given instance, this object indicates the Perreault & Tsou Expires March 8, 2012 [Page 32] Internet-Draft NAT-MIB-bis September 2011 time that this bind has been idle without any sessions attached to it. The value of this object is of relevance only for dynamic NAT." ::= { natAddrBindEntry 11 } natAddrBindInTranslates OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of inbound packets that were successfully translated by using this bind entry. Discontinuities in the value of this counter can occur at reinitialization of the management system and at other times, as indicated by the value of ifCounterDiscontinuityTime on the relevant interface." ::= { natAddrBindEntry 12 } natAddrBindOutTranslates OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of outbound packets that were successfully translated using this bind entry. Discontinuities in the value of this counter can occur at reinitialization of the management system and at other times as indicated by the value of ifCounterDiscontinuityTime on the relevant interface." ::= { natAddrBindEntry 13 } -- -- Address Port Bind section -- natAddrPortBindNumberOfEntries OBJECT-TYPE SYNTAX Gauge32 MAX-ACCESS read-only STATUS current DESCRIPTION "This object maintains a count of the number of entries that currently exist in the natAddrPortBindTable." ::= { natMIBObjects 7 } Perreault & Tsou Expires March 8, 2012 [Page 33] Internet-Draft NAT-MIB-bis September 2011 -- -- The NAT Address Port Bind Table -- natAddrPortBindTable OBJECT-TYPE SYNTAX SEQUENCE OF NatAddrPortBindEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "This table holds information about the currently active NAPT BINDs." ::= { natMIBObjects 8 } natAddrPortBindEntry OBJECT-TYPE SYNTAX NatAddrPortBindEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "Each entry in the this table holds information about a NAPT bind that is currently active. These entries are lost upon agent restart. This row has indexing which may create variables with more than 128 subidentifiers. Implementers of this table must be careful not to create entries which would result in OIDs that exceed the 128 subidentifier limit. Otherwise, the information cannot be accessed using SNMPv1, SNMPv2c or SNMPv3." INDEX { ifIndex, natAddrPortBindLocalAddrType, natAddrPortBindLocalAddr, natAddrPortBindLocalPort, natAddrPortBindProtocol } ::= { natAddrPortBindTable 1 } NatAddrPortBindEntry ::= SEQUENCE { natAddrPortBindLocalAddrType InetAddressType, natAddrPortBindLocalAddr InetAddress, natAddrPortBindLocalPort InetPortNumber, natAddrPortBindProtocol NatProtocolType, natAddrPortBindGlobalAddrType InetAddressType, natAddrPortBindGlobalAddr InetAddress, natAddrPortBindGlobalPort InetPortNumber, natAddrPortBindId NatBindId, natAddrPortBindTranslationEntity NatTranslationEntity, natAddrPortBindType NatAssociationType, natAddrPortBindMapIndex NatAddrMapId, natAddrPortBindSessions Gauge32, natAddrPortBindMaxIdleTime TimeTicks, natAddrPortBindCurrentIdleTime TimeTicks, Perreault & Tsou Expires March 8, 2012 [Page 34] Internet-Draft NAT-MIB-bis September 2011 natAddrPortBindInTranslates Counter64, natAddrPortBindOutTranslates Counter64 } natAddrPortBindLocalAddrType OBJECT-TYPE SYNTAX InetAddressType MAX-ACCESS not-accessible STATUS current DESCRIPTION "This object specifies the address type used for natAddrPortBindLocalAddr." ::= { natAddrPortBindEntry 1 } natAddrPortBindLocalAddr OBJECT-TYPE SYNTAX InetAddress MAX-ACCESS not-accessible STATUS current DESCRIPTION "This object represents the private-realm specific network layer address which, in conjunction with natAddrPortBindLocalPort, maps to the public-realm network layer address and transport id represented by natAddrPortBindGlobalAddr and natAddrPortBindGlobalPort respectively. The type of this address is determined by the value of the natAddrPortBindLocalAddrType object." ::= { natAddrPortBindEntry 2 } natAddrPortBindLocalPort OBJECT-TYPE SYNTAX InetPortNumber MAX-ACCESS not-accessible STATUS current DESCRIPTION "For a protocol value TCP or UDP, this object represents the private-realm specific port number. On the other hand, for ICMP a bind is created only for query/response type ICMP messages such as ICMP echo, Timestamp, and Information request messages, and this object represents the private-realm specific identifier in the ICMP message, as defined in RFC 792 for ICMPv4 and in RFC 2463 for ICMPv6. This object, together with natAddrPortBindProtocol, natAddrPortBindLocalAddrType, and natAddrPortBindLocalAddr, constitutes a session endpoint in the private realm. A bind entry binds a private realm specific endpoint to a Perreault & Tsou Expires March 8, 2012 [Page 35] Internet-Draft NAT-MIB-bis September 2011 public realm specific endpoint, as represented by the tuple of (natAddrPortBindGlobalPort, natAddrPortBindProtocol, natAddrPortBindGlobalAddrType, and natAddrPortBindGlobalAddr)." ::= { natAddrPortBindEntry 3 } natAddrPortBindProtocol OBJECT-TYPE SYNTAX NatProtocolType MAX-ACCESS not-accessible STATUS current DESCRIPTION "This object specifies a protocol identifier. If the value of this object is none(1), then this bind entry applies to all IP traffic. Any other value of this object specifies the class of IP traffic to which this BIND applies." ::= { natAddrPortBindEntry 4 } natAddrPortBindGlobalAddrType OBJECT-TYPE SYNTAX InetAddressType MAX-ACCESS read-only STATUS current DESCRIPTION "This object specifies the address type used for natAddrPortBindGlobalAddr." ::= { natAddrPortBindEntry 5 } natAddrPortBindGlobalAddr OBJECT-TYPE SYNTAX InetAddress MAX-ACCESS read-only STATUS current DESCRIPTION "This object represents the public-realm specific network layer address that, in conjunction with natAddrPortBindGlobalPort, maps to the private-realm network layer address and transport id represented by natAddrPortBindLocalAddr and natAddrPortBindLocalPort, respectively. The type of this address is determined by the value of the natAddrPortBindGlobalAddrType object." ::= { natAddrPortBindEntry 6 } natAddrPortBindGlobalPort OBJECT-TYPE SYNTAX InetPortNumber MAX-ACCESS read-only STATUS current Perreault & Tsou Expires March 8, 2012 [Page 36] Internet-Draft NAT-MIB-bis September 2011 DESCRIPTION "For a protocol value TCP or UDP, this object represents the public-realm specific port number. On the other hand, for ICMP a bind is created only for query/response type ICMP messages such as ICMP echo, Timestamp, and Information request messages, and this object represents the public-realm specific identifier in the ICMP message, as defined in RFC 792 for ICMPv4 and in RFC 2463 for ICMPv6. This object, together with natAddrPortBindProtocol, natAddrPortBindGlobalAddrType, and natAddrPortBindGlobalAddr, constitutes a session endpoint in the public realm. A bind entry binds a public realm specific endpoint to a private realm specific endpoint, as represented by the tuple of (natAddrPortBindLocalPort, natAddrPortBindProtocol, natAddrPortBindLocalAddrType, and natAddrPortBindLocalAddr)." ::= { natAddrPortBindEntry 7 } natAddrPortBindId OBJECT-TYPE SYNTAX NatBindId MAX-ACCESS read-only STATUS current DESCRIPTION "This object represents a bind id that is dynamically assigned to each bind by a NAT enabled device. Each bind is represented by a unique bind id across both the natAddrBindTable and the natAddrPortBindTable." ::= { natAddrPortBindEntry 8 } natAddrPortBindTranslationEntity OBJECT-TYPE SYNTAX NatTranslationEntity MAX-ACCESS read-only STATUS current DESCRIPTION "This object represents the direction of sessions for which this bind is applicable and the entity (source or destination) within the sessions that is subject to translation with the BIND. Orientation of the bind can be a superset of the translationEntity of the address map entry that forms the basis for this bind. For example, if the translationEntity of an address map entry is outboundSrcEndPoint, the Perreault & Tsou Expires March 8, 2012 [Page 37] Internet-Draft NAT-MIB-bis September 2011 translationEntity of a bind derived from this map entry may either be outboundSrcEndPoint or may be bidirectional (a bitmask of outboundSrcEndPoint and inboundDstEndPoint)." ::= { natAddrPortBindEntry 9 } natAddrPortBindType OBJECT-TYPE SYNTAX NatAssociationType MAX-ACCESS read-only STATUS current DESCRIPTION "This object indicates whether the bind is static or dynamic." ::= { natAddrPortBindEntry 10 } natAddrPortBindMapIndex OBJECT-TYPE SYNTAX NatAddrMapId MAX-ACCESS read-only STATUS current DESCRIPTION "This object is a pointer to the natAddrMapTable entry (and the parameters of that entry) used in creating this BIND. This object, in conjunction with the ifIndex (which identifies a unique addrMapName), points to a unique entry in the natAddrMapTable." ::= { natAddrPortBindEntry 11 } natAddrPortBindSessions OBJECT-TYPE SYNTAX Gauge32 MAX-ACCESS read-only STATUS current DESCRIPTION "Number of sessions currently using this BIND." ::= { natAddrPortBindEntry 12 } natAddrPortBindMaxIdleTime OBJECT-TYPE SYNTAX TimeTicks MAX-ACCESS read-only STATUS current DESCRIPTION "This object indicates the maximum time for which this bind can be idle without any sessions attached to it. The value of this object is of relevance only for dynamic NAT." ::= { natAddrPortBindEntry 13 } Perreault & Tsou Expires March 8, 2012 [Page 38] Internet-Draft NAT-MIB-bis September 2011 natAddrPortBindCurrentIdleTime OBJECT-TYPE SYNTAX TimeTicks MAX-ACCESS read-only STATUS current DESCRIPTION "At any given instance, this object indicates the time that this bind has been idle without any sessions attached to it. The value of this object is of relevance only for dynamic NAT." ::= { natAddrPortBindEntry 14 } natAddrPortBindInTranslates OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of inbound packets that were translated as per this bind entry. Discontinuities in the value of this counter can occur at reinitialization of the management system and at other times, as indicated by the value of ifCounterDiscontinuityTime on the relevant interface." ::= { natAddrPortBindEntry 15 } natAddrPortBindOutTranslates OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of outbound packets that were translated as per this bind entry. Discontinuities in the value of this counter can occur at reinitialization of the management system and at other times, as indicated by the value of ifCounterDiscontinuityTime on the relevant interface." ::= { natAddrPortBindEntry 16 } -- -- The Session Table -- natSessionTable OBJECT-TYPE SYNTAX SEQUENCE OF NatSessionEntry MAX-ACCESS not-accessible Perreault & Tsou Expires March 8, 2012 [Page 39] Internet-Draft NAT-MIB-bis September 2011 STATUS current DESCRIPTION "The (conceptual) table containing one entry for each NAT session currently active on this NAT device." ::= { natMIBObjects 9 } natSessionEntry OBJECT-TYPE SYNTAX NatSessionEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry (conceptual row) containing information about an active NAT session on this NAT device. These entries are lost upon agent restart." INDEX { ifIndex, natSessionIndex } ::= { natSessionTable 1 } NatSessionEntry ::= SEQUENCE { natSessionIndex NatSessionId, natSessionPrivateSrcEPBindId NatBindIdOrZero, natSessionPrivateSrcEPBindMode NatBindMode, natSessionPrivateDstEPBindId NatBindIdOrZero, natSessionPrivateDstEPBindMode NatBindMode, natSessionDirection INTEGER, natSessionUpTime TimeTicks, natSessionAddrMapIndex NatAddrMapId, natSessionProtocolType NatProtocolType, natSessionPrivateAddrType InetAddressType, natSessionPrivateSrcAddr InetAddress, natSessionPrivateSrcPort InetPortNumber, natSessionPrivateDstAddr InetAddress, natSessionPrivateDstPort InetPortNumber, natSessionPublicAddrType InetAddressType, natSessionPublicSrcAddr InetAddress, natSessionPublicSrcPort InetPortNumber, natSessionPublicDstAddr InetAddress, natSessionPublicDstPort InetPortNumber, natSessionMaxIdleTime TimeTicks, natSessionCurrentIdleTime TimeTicks, natSessionInTranslates Counter64, natSessionOutTranslates Counter64 } natSessionIndex OBJECT-TYPE SYNTAX NatSessionId MAX-ACCESS not-accessible STATUS current DESCRIPTION Perreault & Tsou Expires March 8, 2012 [Page 40] Internet-Draft NAT-MIB-bis September 2011 "The session ID for this NAT session." ::= { natSessionEntry 1 } natSessionPrivateSrcEPBindId OBJECT-TYPE SYNTAX NatBindIdOrZero MAX-ACCESS read-only STATUS current DESCRIPTION "The bind id associated between private and public source end points. In the case of Symmetric-NAT, this should be set to zero." ::= { natSessionEntry 2 } natSessionPrivateSrcEPBindMode OBJECT-TYPE SYNTAX NatBindMode MAX-ACCESS read-only STATUS current DESCRIPTION "This object indicates whether the bind indicated by the object natSessionPrivateSrcEPBindId is an address bind or an address port bind." ::= { natSessionEntry 3 } natSessionPrivateDstEPBindId OBJECT-TYPE SYNTAX NatBindIdOrZero MAX-ACCESS read-only STATUS current DESCRIPTION "The bind id associated between private and public destination end points." ::= { natSessionEntry 4 } natSessionPrivateDstEPBindMode OBJECT-TYPE SYNTAX NatBindMode MAX-ACCESS read-only STATUS current DESCRIPTION "This object indicates whether the bind indicated by the object natSessionPrivateDstEPBindId is an address bind or an address port bind." ::= { natSessionEntry 5 } natSessionDirection OBJECT-TYPE SYNTAX INTEGER { inbound (1), outbound (2) } Perreault & Tsou Expires March 8, 2012 [Page 41] Internet-Draft NAT-MIB-bis September 2011 MAX-ACCESS read-only STATUS current DESCRIPTION "The direction of this session with respect to the local network. 'inbound' indicates that this session was initiated from the public network into the private network. 'outbound' indicates that this session was initiated from the private network into the public network." ::= { natSessionEntry 6 } natSessionUpTime OBJECT-TYPE SYNTAX TimeTicks MAX-ACCESS read-only STATUS current DESCRIPTION "The up time of this session in one-hundredths of a second." ::= { natSessionEntry 7 } natSessionAddrMapIndex OBJECT-TYPE SYNTAX NatAddrMapId MAX-ACCESS read-only STATUS current DESCRIPTION "This object is a pointer to the natAddrMapTable entry (and the parameters of that entry) used in creating this session. This object, in conjunction with the ifIndex (which identifies a unique addrMapName), points to a unique entry in the natAddrMapTable." ::= { natSessionEntry 8 } natSessionProtocolType OBJECT-TYPE SYNTAX NatProtocolType MAX-ACCESS read-only STATUS current DESCRIPTION "The protocol type of this session." ::= { natSessionEntry 9 } natSessionPrivateAddrType OBJECT-TYPE SYNTAX InetAddressType MAX-ACCESS read-only STATUS current DESCRIPTION "This object specifies the address type used for natSessionPrivateSrcAddr and natSessionPrivateDstAddr." ::= { natSessionEntry 10 } Perreault & Tsou Expires March 8, 2012 [Page 42] Internet-Draft NAT-MIB-bis September 2011 natSessionPrivateSrcAddr OBJECT-TYPE SYNTAX InetAddress MAX-ACCESS read-only STATUS current DESCRIPTION "The source IP address of the session endpoint that lies in the private network. The value of this object must be zero only when the natSessionPrivateSrcEPBindId object has a zero value. When the value of this object is zero, the NAT session lookup will match any IP address to this field. The type of this address is determined by the value of the natSessionPrivateAddrType object." ::= { natSessionEntry 11 } natSessionPrivateSrcPort OBJECT-TYPE SYNTAX InetPortNumber MAX-ACCESS read-only STATUS current DESCRIPTION "When the value of protocol is TCP or UDP, this object represents the source port in the first packet of session while in private-realm. On the other hand, when the protocol is ICMP, a NAT session is created only for query/response type ICMP messages such as ICMP echo, Timestamp, and Information request messages, and this object represents the private-realm specific identifier in the ICMP message, as defined in RFC 792 for ICMPv4 and in RFC 2463 for ICMPv6. The value of this object must be zero when the natSessionPrivateSrcEPBindId object has zero value and value of natSessionPrivateSrcEPBindMode is addressPortBind(2). In such a case, the NAT session lookup will match any port number to this field. The value of this object must be zero when the object is not a representative field (SrcPort, DstPort, or ICMP identifier) of the session tuple in either the public realm or the private realm." ::= { natSessionEntry 12 } natSessionPrivateDstAddr OBJECT-TYPE SYNTAX InetAddress MAX-ACCESS read-only STATUS current Perreault & Tsou Expires March 8, 2012 [Page 43] Internet-Draft NAT-MIB-bis September 2011 DESCRIPTION "The destination IP address of the session endpoint that lies in the private network. The value of this object must be zero when the natSessionPrivateDstEPBindId object has a zero value. In such a scenario, the NAT session lookup will match any IP address to this field. The type of this address is determined by the value of the natSessionPrivateAddrType object." ::= { natSessionEntry 13 } natSessionPrivateDstPort OBJECT-TYPE SYNTAX InetPortNumber MAX-ACCESS read-only STATUS current DESCRIPTION "When the value of protocol is TCP or UDP, this object represents the destination port in the first packet of session while in private-realm. On the other hand, when the protocol is ICMP, this object is not relevant and should be set to zero. The value of this object must be zero when the natSessionPrivateDstEPBindId object has a zero value and natSessionPrivateDstEPBindMode is set to addressPortBind(2). In such a case, the NAT session lookup will match any port number to this field. The value of this object must be zero when the object is not a representative field (SrcPort, DstPort, or ICMP identifier) of the session tuple in either the public realm or the private realm." ::= { natSessionEntry 14 } natSessionPublicAddrType OBJECT-TYPE SYNTAX InetAddressType MAX-ACCESS read-only STATUS current DESCRIPTION "This object specifies the address type used for natSessionPublicSrcAddr and natSessionPublicDstAddr." ::= { natSessionEntry 15 } natSessionPublicSrcAddr OBJECT-TYPE SYNTAX InetAddress MAX-ACCESS read-only Perreault & Tsou Expires March 8, 2012 [Page 44] Internet-Draft NAT-MIB-bis September 2011 STATUS current DESCRIPTION "The source IP address of the session endpoint that lies in the public network. The value of this object must be zero when the natSessionPrivateSrcEPBindId object has a zero value. In such a scenario, the NAT session lookup will match any IP address to this field. The type of this address is determined by the value of the natSessionPublicAddrType object." ::= { natSessionEntry 16 } natSessionPublicSrcPort OBJECT-TYPE SYNTAX InetPortNumber MAX-ACCESS read-only STATUS current DESCRIPTION "When the value of protocol is TCP or UDP, this object represents the source port in the first packet of session while in public-realm. On the other hand, when protocol is ICMP, a NAT session is created only for query/response type ICMP messages such as ICMP echo, Timestamp, and Information request messages, and this object represents the public-realm specific identifier in the ICMP message, as defined in RFC 792 for ICMPv4 and in RFC 2463 for ICMPv6. The value of this object must be zero when the natSessionPrivateSrcEPBindId object has a zero value and natSessionPrivateSrcEPBindMode is set to addressPortBind(2). In such a scenario, the NAT session lookup will match any port number to this field. The value of this object must be zero when the object is not a representative field (SrcPort, DstPort or ICMP identifier) of the session tuple in either the public realm or the private realm." ::= { natSessionEntry 17 } natSessionPublicDstAddr OBJECT-TYPE SYNTAX InetAddress MAX-ACCESS read-only STATUS current DESCRIPTION "The destination IP address of the session endpoint that Perreault & Tsou Expires March 8, 2012 [Page 45] Internet-Draft NAT-MIB-bis September 2011 lies in the public network. The value of this object must be non-zero when the natSessionPrivateDstEPBindId object has a non-zero value. If the value of this object and the corresponding natSessionPrivateDstEPBindId object value is zero, then the NAT session lookup will match any IP address to this field. The type of this address is determined by the value of the natSessionPublicAddrType object." ::= { natSessionEntry 18 } natSessionPublicDstPort OBJECT-TYPE SYNTAX InetPortNumber MAX-ACCESS read-only STATUS current DESCRIPTION "When the value of protocol is TCP or UDP, this object represents the destination port in the first packet of session while in public-realm. On the other hand, when the protocol is ICMP, this object is not relevant for translation and should be zero. The value of this object must be zero when the natSessionPrivateDstEPBindId object has a zero value and natSessionPrivateDstEPBindMode is addressPortBind(2). In such a scenario, the NAT session lookup will match any port number to this field. The value of this object must be zero when the object is not a representative field (SrcPort, DstPort, or ICMP identifier) of the session tuple in either the public realm or the private realm." ::= { natSessionEntry 19 } natSessionMaxIdleTime OBJECT-TYPE SYNTAX TimeTicks MAX-ACCESS read-only STATUS current DESCRIPTION "The max time for which this session can be idle without detecting a packet." ::= { natSessionEntry 20 } natSessionCurrentIdleTime OBJECT-TYPE SYNTAX TimeTicks Perreault & Tsou Expires March 8, 2012 [Page 46] Internet-Draft NAT-MIB-bis September 2011 MAX-ACCESS read-only STATUS current DESCRIPTION "The time since a packet belonging to this session was last detected." ::= { natSessionEntry 21 } natSessionInTranslates OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of inbound packets that were translated for this session. Discontinuities in the value of this counter can occur at reinitialization of the management system and at other times, as indicated by the value of ifCounterDiscontinuityTime on the relevant interface." ::= { natSessionEntry 22 } natSessionOutTranslates OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of outbound packets that were translated for this session. Discontinuities in the value of this counter can occur at reinitialization of the management system and at other times, as indicated by the value of ifCounterDiscontinuityTime on the relevant interface." ::= { natSessionEntry 23 } -- -- The Protocol table -- natProtocolTable OBJECT-TYPE SYNTAX SEQUENCE OF NatProtocolEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "The (conceptual) table containing per protocol NAT statistics." ::= { natMIBObjects 10 } Perreault & Tsou Expires March 8, 2012 [Page 47] Internet-Draft NAT-MIB-bis September 2011 natProtocolEntry OBJECT-TYPE SYNTAX NatProtocolEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry (conceptual row) containing NAT statistics pertaining to a particular protocol." INDEX { natProtocol } ::= { natProtocolTable 1 } NatProtocolEntry ::= SEQUENCE { natProtocol NatProtocolType, natProtocolInTranslates Counter64, natProtocolOutTranslates Counter64, natProtocolDiscards Counter64 } natProtocol OBJECT-TYPE SYNTAX NatProtocolType MAX-ACCESS not-accessible STATUS current DESCRIPTION "This object represents the protocol pertaining to which parameters are reported." ::= { natProtocolEntry 1 } natProtocolInTranslates OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of inbound packets pertaining to the protocol identified by natProtocol that underwent NAT. Discontinuities in the value of this counter can occur at reinitialization of the management system and at other times, as indicated by the value of ifCounterDiscontinuityTime on the relevant interface." ::= { natProtocolEntry 2 } natProtocolOutTranslates OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of outbound packets pertaining to the protocol identified by natProtocol that underwent NAT. Perreault & Tsou Expires March 8, 2012 [Page 48] Internet-Draft NAT-MIB-bis September 2011 Discontinuities in the value of this counter can occur at reinitialization of the management system and at other times, as indicated by the value of ifCounterDiscontinuityTime on the relevant interface." ::= { natProtocolEntry 3 } natProtocolDiscards OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of packets pertaining to the protocol identified by natProtocol that had to be rejected/dropped due to lack of resources. These rejections could be due to session timeout, resource unavailability, lack of address space, etc. Discontinuities in the value of this counter can occur at reinitialization of the management system and at other times, as indicated by the value of ifCounterDiscontinuityTime on the relevant interface." ::= { natProtocolEntry 4 } -- -- The Shared Address Map Table -- natSharedAddrMapTable OBJECT-TYPE SYNTAX SEQUENCE OF NatSharedAddrMapEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "This table lists address map parameters for NAT." ::= { natMIBObjects 11 } natSharedAddrMapEntry OBJECT-TYPE SYNTAX NatSharedAddrMapEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "This entry represents an address map to be used for NAT and contributes to the dynamic and/or static address mapping tables of the NAT device." INDEX { natSharedAddrMapIndex } ::= { natSharedAddrMapTable 1 } NatSharedAddrMapEntry ::= SEQUENCE { Perreault & Tsou Expires March 8, 2012 [Page 49] Internet-Draft NAT-MIB-bis September 2011 natSharedAddrMapIndex NatSharedAddrMapId, natSharedAddrMapName SnmpAdminString, natSharedAddrMapEntryType NatAssociationType, natSharedAddrMapTranslatEntity NatTranslationEntity, natSharedAddrMapLocalAddrType InetAddressType, natSharedAddrMapLocalAddrFrom InetAddress, natSharedAddrMapLocalAddrTo InetAddress, natSharedAddrMapLocalPortFrom InetPortNumber, natSharedAddrMapLocalPortTo InetPortNumber, natSharedAddrMapGlobalAddrType InetAddressType, natSharedAddrMapGlobalAddrFrom InetAddress, natSharedAddrMapGlobalAddrTo InetAddress, natSharedAddrMapGlobalPortFrom InetPortNumber, natSharedAddrMapGlobalPortTo InetPortNumber, natSharedAddrMapProtocol NatProtocolMap, natSharedAddrMapInTranslates Counter64, natSharedAddrMapOutTranslates Counter64, natSharedAddrMapDiscards Counter64, natSharedAddrMapAddrUsed Gauge32, natSharedAddrMapStorageType StorageType, natSharedAddrMapRowStatus RowStatus } natSharedAddrMapIndex OBJECT-TYPE SYNTAX NatSharedAddrMapId MAX-ACCESS not-accessible STATUS current DESCRIPTION "Along with ifIndex, this object uniquely identifies an entry in the natAddrMapTable. Address map entries are applied in the order specified by natAddrMapIndex." ::= { natSharedAddrMapEntry 1 } natSharedAddrMapName OBJECT-TYPE SYNTAX SnmpAdminString (SIZE(1..32)) MAX-ACCESS read-create STATUS current DESCRIPTION "Name identifying all map entries in the table associated with the same interface. All map entries with the same ifIndex MUST have the same map name." ::= { natSharedAddrMapEntry 2 } natSharedAddrMapEntryType OBJECT-TYPE SYNTAX NatAssociationType MAX-ACCESS read-create STATUS current Perreault & Tsou Expires March 8, 2012 [Page 50] Internet-Draft NAT-MIB-bis September 2011 DESCRIPTION "This parameter can be used to set up static or dynamic address maps." ::= { natSharedAddrMapEntry 3 } natSharedAddrMapTranslatEntity OBJECT-TYPE SYNTAX NatTranslationEntity MAX-ACCESS read-create STATUS current DESCRIPTION "The end-point entity (source or destination) in inbound or outbound sessions (i.e., first packets) that may be translated by an address map entry. Session direction (inbound or outbound) is derived from the direction of the first packet of a session traversing a NAT interface. NAT address (and Transport-ID) maps may be defined to effect inbound or outbound sessions. Traditionally, address maps for Basic NAT and NAPT are configured on a public interface for outbound sessions, effecting translation of source end-point. The value of this object must be set to outboundSrcEndPoint for those interfaces. Alternately, if address maps for Basic NAT and NAPT were to be configured on a private interface, the desired value for this object for the map entries would be inboundSrcEndPoint (i.e., effecting translation of source end-point for inbound sessions). If TwiceNAT were to be configured on a private interface, the desired value for this object for the map entries would be a bitmask of inboundSrcEndPoint and inboundDstEndPoint." ::= { natSharedAddrMapEntry 4 } natSharedAddrMapLocalAddrType OBJECT-TYPE SYNTAX InetAddressType MAX-ACCESS read-create STATUS current DESCRIPTION "This object specifies the address type used for natAddrMapLocalAddrFrom and natAddrMapLocalAddrTo." ::= { natSharedAddrMapEntry 5 } natSharedAddrMapLocalAddrFrom OBJECT-TYPE Perreault & Tsou Expires March 8, 2012 [Page 51] Internet-Draft NAT-MIB-bis September 2011 SYNTAX InetAddress MAX-ACCESS read-create STATUS current DESCRIPTION "This object specifies the first IP address of the range of IP addresses mapped by this translation entry. The value of this object must be less than or equal to the value of the natAddrMapLocalAddrTo object. The type of this address is determined by the value of the natAddrMapLocalAddrType object." ::= { natSharedAddrMapEntry 6 } natSharedAddrMapLocalAddrTo OBJECT-TYPE SYNTAX InetAddress MAX-ACCESS read-create STATUS current DESCRIPTION "This object specifies the last IP address of the range of IP addresses mapped by this translation entry. If only a single address is being mapped, the value of this object is equal to the value of natAddrMapLocalAddrFrom. For a static NAT, the number of addresses in the range defined by natAddrMapLocalAddrFrom and natAddrMapLocalAddrTo must be equal to the number of addresses in the range defined by natAddrMapGlobalAddrFrom and natAddrMapGlobalAddrTo. The value of this object must be greater than or equal to the value of the natAddrMapLocalAddrFrom object. The type of this address is determined by the value of the natAddrMapLocalAddrType object." ::= { natSharedAddrMapEntry 7 } natSharedAddrMapLocalPortFrom OBJECT-TYPE SYNTAX InetPortNumber MAX-ACCESS read-create STATUS current DESCRIPTION "If this conceptual row describes a Basic NAT address mapping, then the value of this object must be zero. If this conceptual row describes NAPT, then the value of this object specifies the first port number in the range of ports being mapped. The value of this object must be less than or equal to the value of the natAddrMapLocalPortTo object. If the translation specifies a single port, then the value of this object is equal to the value of natAddrMapLocalPortTo." Perreault & Tsou Expires March 8, 2012 [Page 52] Internet-Draft NAT-MIB-bis September 2011 DEFVAL { 0 } ::= { natSharedAddrMapEntry 8 } natSharedAddrMapLocalPortTo OBJECT-TYPE SYNTAX InetPortNumber MAX-ACCESS read-create STATUS current DESCRIPTION "If this conceptual row describes a Basic NAT address mapping, then the value of this object must be zero. If this conceptual row describes NAPT, then the value of this object specifies the last port number in the range of ports being mapped. The value of this object must be greater than or equal to the value of the natAddrMapLocalPortFrom object. If the translation specifies a single port, then the value of this object is equal to the value of natAddrMapLocalPortFrom." DEFVAL { 0 } ::= { natSharedAddrMapEntry 9 } natSharedAddrMapGlobalAddrType OBJECT-TYPE SYNTAX InetAddressType MAX-ACCESS read-create STATUS current DESCRIPTION "This object specifies the address type used for natAddrMapGlobalAddrFrom and natAddrMapGlobalAddrTo." ::= { natSharedAddrMapEntry 10 } natSharedAddrMapGlobalAddrFrom OBJECT-TYPE SYNTAX InetAddress MAX-ACCESS read-create STATUS current DESCRIPTION "This object specifies the first IP address of the range of IP addresses being mapped to. The value of this object must be less than or equal to the value of the natAddrMapGlobalAddrTo object. The type of this address is determined by the value of the natAddrMapGlobalAddrType object." ::= { natSharedAddrMapEntry 11 } natSharedAddrMapGlobalAddrTo OBJECT-TYPE SYNTAX InetAddress MAX-ACCESS read-create STATUS current Perreault & Tsou Expires March 8, 2012 [Page 53] Internet-Draft NAT-MIB-bis September 2011 DESCRIPTION "This object specifies the last IP address of the range of IP addresses being mapped to. If only a single address is being mapped to, the value of this object is equal to the value of natAddrMapGlobalAddrFrom. For a static NAT, the number of addresses in the range defined by natAddrMapGlobalAddrFrom and natAddrMapGlobalAddrTo must be equal to the number of addresses in the range defined by natAddrMapLocalAddrFrom and natAddrMapLocalAddrTo. The value of this object must be greater than or equal to the value of the natAddrMapGlobalAddrFrom object. The type of this address is determined by the value of the natAddrMapGlobalAddrType object." ::= { natSharedAddrMapEntry 12 } natSharedAddrMapGlobalPortFrom OBJECT-TYPE SYNTAX InetPortNumber MAX-ACCESS read-create STATUS current DESCRIPTION "If this conceptual row describes a Basic NAT address mapping, then the value of this object must be zero. If this conceptual row describes NAPT, then the value of this object specifies the first port number in the range of ports being mapped to. The value of this object must be less than or equal to the value of the natAddrMapGlobalPortTo object. If the translation specifies a single port, then the value of this object is equal to the value natAddrMapGlobalPortTo." DEFVAL { 0 } ::= { natSharedAddrMapEntry 13 } natSharedAddrMapGlobalPortTo OBJECT-TYPE SYNTAX InetPortNumber MAX-ACCESS read-create STATUS current DESCRIPTION "If this conceptual row describes a Basic NAT address mapping, then the value of this object must be zero. If this conceptual row describes NAPT, then the value of this object specifies the last port number in the range of ports being mapped to. The value of this object must be greater than or equal to the value of the natAddrMapGlobalPortFrom object. If the Perreault & Tsou Expires March 8, 2012 [Page 54] Internet-Draft NAT-MIB-bis September 2011 translation specifies a single port, then the value of this object is equal to the value of natAddrMapGlobalPortFrom." DEFVAL { 0 } ::= { natSharedAddrMapEntry 14 } natSharedAddrMapProtocol OBJECT-TYPE SYNTAX NatProtocolMap MAX-ACCESS read-create STATUS current DESCRIPTION "This object specifies a bitmap of protocol identifiers." ::= { natSharedAddrMapEntry 15 } natSharedAddrMapInTranslates OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of inbound packets pertaining to this address map entry that were translated. Discontinuities in the value of this counter can occur at reinitialization of the management system and at other times, as indicated by the value of ifCounterDiscontinuityTime on the relevant interface." ::= { natSharedAddrMapEntry 16 } natSharedAddrMapOutTranslates OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of outbound packets pertaining to this address map entry that were translated. Discontinuities in the value of this counter can occur at reinitialization of the management system and at other times, as indicated by the value of ifCounterDiscontinuityTime on the relevant interface." ::= { natSharedAddrMapEntry 17 } natSharedAddrMapDiscards OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of packets pertaining to this address map entry that were dropped due to lack of addresses in the Perreault & Tsou Expires March 8, 2012 [Page 55] Internet-Draft NAT-MIB-bis September 2011 address pool identified by this address map. The value of this object must always be zero in case of static address map. Discontinuities in the value of this counter can occur at reinitialization of the management system and at other times, as indicated by the value of ifCounterDiscontinuityTime on the relevant interface." ::= { natSharedAddrMapEntry 18 } natSharedAddrMapAddrUsed OBJECT-TYPE SYNTAX Gauge32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of addresses pertaining to this address map that are currently being used from the NAT pool. The value of this object must always be zero in the case of a static address map." ::= { natSharedAddrMapEntry 19 } natSharedAddrMapStorageType OBJECT-TYPE SYNTAX StorageType MAX-ACCESS read-create STATUS current DESCRIPTION "The storage type for this conceptual row. Conceptual rows having the value 'permanent' need not allow write-access to any columnar objects in the row." REFERENCE "Textual Conventions for SMIv2, Section 2." DEFVAL { nonVolatile } ::= { natSharedAddrMapEntry 20 } natSharedAddrMapRowStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS current DESCRIPTION "The status of this conceptual row. Until instances of all corresponding columns are appropriately configured, the value of the corresponding instance of the natAddrMapRowStatus column is 'notReady'. None of the objects in this row may be modified Perreault & Tsou Expires March 8, 2012 [Page 56] Internet-Draft NAT-MIB-bis September 2011 while the value of this object is active(1)." REFERENCE "Textual Conventions for SMIv2, Section 2." ::= { natSharedAddrMapEntry 21 } -- -- Notifications section -- natMIBNotifications OBJECT IDENTIFIER ::= { natMIB 0 } -- -- Notifications -- natPacketDiscard NOTIFICATION-TYPE OBJECTS { ifIndex } STATUS current DESCRIPTION "This notification is generated when IP packets are discarded by the NAT function; e.g., due to lack of mapping space when NAT is out of addresses or ports. Note that the generation of natPacketDiscard notifications is throttled by the agent, as specified by the 'natNotifThrottlingInterval' object." ::= { natMIBNotifications 1 } -- -- Conformance information. -- natMIBConformance OBJECT IDENTIFIER ::= { natMIB 2 } natMIBGroups OBJECT IDENTIFIER ::= { natMIBConformance 1 } natMIBCompliances OBJECT IDENTIFIER ::= { natMIBConformance 2 } -- -- Units of conformance -- natConfigGroup OBJECT-GROUP OBJECTS { natInterfaceRealm, natInterfaceServiceType, natInterfaceStorageType, natInterfaceRowStatus, natAddrMapName, Perreault & Tsou Expires March 8, 2012 [Page 57] Internet-Draft NAT-MIB-bis September 2011 natAddrMapEntryType, natAddrMapTranslationEntity, natAddrMapLocalAddrType, natAddrMapLocalAddrFrom, natAddrMapLocalAddrTo, natAddrMapLocalPortFrom, natAddrMapLocalPortTo, natAddrMapGlobalAddrType, natAddrMapGlobalAddrFrom, natAddrMapGlobalAddrTo, natAddrMapGlobalPortFrom, natAddrMapGlobalPortTo, natAddrMapProtocol, natAddrMapStorageType, natAddrMapRowStatus, natSharedAddrMapName, natSharedAddrMapEntryType, natSharedAddrMapTranslatEntity, natSharedAddrMapLocalAddrType, natSharedAddrMapLocalAddrFrom, natSharedAddrMapLocalAddrTo, natSharedAddrMapLocalPortFrom, natSharedAddrMapLocalPortTo, natSharedAddrMapGlobalAddrType, natSharedAddrMapGlobalAddrFrom, natSharedAddrMapGlobalAddrTo, natSharedAddrMapGlobalPortFrom, natSharedAddrMapGlobalPortTo, natSharedAddrMapProtocol, natSharedAddrMapStorageType, natSharedAddrMapRowStatus, natBindDefIdleTimeout, natUdpDefIdleTimeout, natIcmpDefIdleTimeout, natOtherDefIdleTimeout, natTcpDefIdleTimeout, natTcpDefNegTimeout, natNotifThrottlingInterval } STATUS current DESCRIPTION "A collection of configuration-related information required to support management of devices supporting NAT." ::= { natMIBGroups 1 } natTranslationGroup OBJECT-GROUP OBJECTS { natAddrBindNumberOfEntries, natAddrBindGlobalAddrType, Perreault & Tsou Expires March 8, 2012 [Page 58] Internet-Draft NAT-MIB-bis September 2011 natAddrBindGlobalAddr, natAddrBindId, natAddrBindTranslationEntity, natAddrBindType, natAddrBindMapIndex, natAddrBindSessions, natAddrBindMaxIdleTime, natAddrBindCurrentIdleTime, natAddrBindInTranslates, natAddrBindOutTranslates, natAddrPortBindNumberOfEntries, natAddrPortBindGlobalAddrType, natAddrPortBindGlobalAddr, natAddrPortBindGlobalPort, natAddrPortBindId, natAddrPortBindTranslationEntity, natAddrPortBindType, natAddrPortBindMapIndex, natAddrPortBindSessions, natAddrPortBindMaxIdleTime, natAddrPortBindCurrentIdleTime, natAddrPortBindInTranslates, natAddrPortBindOutTranslates, natSessionPrivateSrcEPBindId, natSessionPrivateSrcEPBindMode, natSessionPrivateDstEPBindId, natSessionPrivateDstEPBindMode, natSessionDirection, natSessionUpTime, natSessionAddrMapIndex, natSessionProtocolType, natSessionPrivateAddrType, natSessionPrivateSrcAddr, natSessionPrivateSrcPort, natSessionPrivateDstAddr, natSessionPrivateDstPort, natSessionPublicAddrType, natSessionPublicSrcAddr, natSessionPublicSrcPort, natSessionPublicDstAddr, natSessionPublicDstPort, natSessionMaxIdleTime, natSessionCurrentIdleTime, natSessionInTranslates, natSessionOutTranslates } STATUS current DESCRIPTION Perreault & Tsou Expires March 8, 2012 [Page 59] Internet-Draft NAT-MIB-bis September 2011 "A collection of BIND-related objects required to support management of devices supporting NAT." ::= { natMIBGroups 2 } natStatsInterfaceGroup OBJECT-GROUP OBJECTS { natInterfaceInTranslates, natInterfaceOutTranslates, natInterfaceDiscards } STATUS current DESCRIPTION "A collection of NAT statistics associated with the interface on which NAT is configured, to aid troubleshooting/monitoring of the NAT operation." ::= { natMIBGroups 3 } natStatsProtocolGroup OBJECT-GROUP OBJECTS { natProtocolInTranslates, natProtocolOutTranslates, natProtocolDiscards } STATUS current DESCRIPTION "A collection of protocol specific NAT statistics, to aid troubleshooting/monitoring of NAT operation." ::= { natMIBGroups 4 } natStatsAddrMapGroup OBJECT-GROUP OBJECTS { natAddrMapInTranslates, natAddrMapOutTranslates, natAddrMapDiscards, natAddrMapAddrUsed, natSharedAddrMapInTranslates, natSharedAddrMapOutTranslates, natSharedAddrMapDiscards, natSharedAddrMapAddrUsed } STATUS current DESCRIPTION "A collection of address map specific NAT statistics, to aid troubleshooting/monitoring of NAT operation." ::= { natMIBGroups 5 } natMIBNotificationGroup NOTIFICATION-GROUP NOTIFICATIONS { natPacketDiscard } STATUS current DESCRIPTION "A collection of notifications generated by devices supporting this MIB." ::= { natMIBGroups 6 } Perreault & Tsou Expires March 8, 2012 [Page 60] Internet-Draft NAT-MIB-bis September 2011 -- -- Compliance statements -- natMIBFullCompliance MODULE-COMPLIANCE STATUS current DESCRIPTION "When this MIB is implemented with support for read-create, then such an implementation can claim full compliance. Such devices can then be both monitored and configured with this MIB. The following index objects cannot be added as OBJECT clauses but nevertheless have the compliance requirements: " -- OBJECT natAddrBindLocalAddrType -- SYNTAX InetAddressType { ipv4(1), ipv6(2) } -- DESCRIPTION -- "An implementation is required to support -- global IPv4 and/or IPv6 addresses, depending -- on its support for IPv4 and IPv6." -- OBJECT natAddrBindLocalAddr -- SYNTAX InetAddress (SIZE(4|16)) -- DESCRIPTION -- "An implementation is required to support -- global IPv4 and/or IPv6 addresses, depending -- on its support for IPv4 and IPv6." -- OBJECT natAddrPortBindLocalAddrType -- SYNTAX InetAddressType { ipv4(1), ipv6(2) } -- DESCRIPTION -- "An implementation is required to support -- global IPv4 and/or IPv6 addresses, depending -- on its support for IPv4 and IPv6." -- OBJECT natAddrPortBindLocalAddr -- SYNTAX InetAddress (SIZE(4|16)) -- DESCRIPTION -- "An implementation is required to support -- global IPv4 and/or IPv6 addresses, depending -- on its support for IPv4 and IPv6." MODULE IF-MIB -- The interfaces MIB, RFC2863 MANDATORY-GROUPS { ifCounterDiscontinuityGroup } Perreault & Tsou Expires March 8, 2012 [Page 61] Internet-Draft NAT-MIB-bis September 2011 MODULE -- this module MANDATORY-GROUPS { natConfigGroup, natTranslationGroup, natStatsInterfaceGroup } GROUP natStatsProtocolGroup DESCRIPTION "This group is optional." GROUP natStatsAddrMapGroup DESCRIPTION "This group is optional." GROUP natMIBNotificationGroup DESCRIPTION "This group is optional." OBJECT natAddrMapLocalAddrType SYNTAX InetAddressType { ipv4(1), ipv6(2) } DESCRIPTION "An implementation is required to support global IPv4 and/or IPv6 addresses, depending on its support for IPv4 and IPv6." OBJECT natAddrMapLocalAddrFrom SYNTAX InetAddress (SIZE(4|16)) DESCRIPTION "An implementation is required to support global IPv4 and/or IPv6 addresses, depending on its support for IPv4 and IPv6." OBJECT natAddrMapLocalAddrTo SYNTAX InetAddress (SIZE(4|16)) DESCRIPTION "An implementation is required to support global IPv4 and/or IPv6 addresses, depending on its support for IPv4 and IPv6." OBJECT natAddrMapGlobalAddrType SYNTAX InetAddressType { ipv4(1), ipv6(2) } DESCRIPTION "An implementation is required to support global IPv4 and/or IPv6 addresses, depending on its support for IPv4 and IPv6." OBJECT natAddrMapGlobalAddrFrom SYNTAX InetAddress (SIZE(4|16)) DESCRIPTION "An implementation is required to support global IPv4 and/or IPv6 addresses, depending on its support for IPv4 and IPv6." Perreault & Tsou Expires March 8, 2012 [Page 62] Internet-Draft NAT-MIB-bis September 2011 OBJECT natAddrMapGlobalAddrTo SYNTAX InetAddress (SIZE(4|16)) DESCRIPTION "An implementation is required to support global IPv4 and/or IPv6 addresses, depending on its support for IPv4 and IPv6." OBJECT natAddrBindGlobalAddrType SYNTAX InetAddressType { ipv4(1), ipv6(2) } DESCRIPTION "An implementation is required to support global IPv4 and/or IPv6 addresses, depending on its support for IPv4 and IPv6." OBJECT natAddrBindGlobalAddr SYNTAX InetAddress (SIZE(4|16)) DESCRIPTION "An implementation is required to support global IPv4 and/or IPv6 addresses, depending on its support for IPv4 and IPv6." OBJECT natAddrPortBindGlobalAddrType SYNTAX InetAddressType { ipv4(1), ipv6(2) } DESCRIPTION "An implementation is required to support global IPv4 and/or IPv6 addresses, depending on its support for IPv4 and IPv6." OBJECT natAddrPortBindGlobalAddr SYNTAX InetAddress (SIZE(4|16)) DESCRIPTION "An implementation is required to support global IPv4 and/or IPv6 addresses, depending on its support for IPv4 and IPv6." OBJECT natSessionPrivateAddrType SYNTAX InetAddressType { ipv4(1), ipv6(2) } DESCRIPTION "An implementation is required to support global IPv4 and/or IPv6 addresses, depending on its support for IPv4 and IPv6." OBJECT natSessionPrivateSrcAddr SYNTAX InetAddress (SIZE(4|16)) DESCRIPTION "An implementation is required to support global IPv4 and/or IPv6 addresses, depending on its support for IPv4 and IPv6." Perreault & Tsou Expires March 8, 2012 [Page 63] Internet-Draft NAT-MIB-bis September 2011 OBJECT natSessionPrivateDstAddr SYNTAX InetAddress (SIZE(4|16)) DESCRIPTION "An implementation is required to support global IPv4 and/or IPv6 addresses, depending on its support for IPv4 and IPv6." OBJECT natSessionPublicAddrType SYNTAX InetAddressType { ipv4(1), ipv6(2) } DESCRIPTION "An implementation is required to support global IPv4 and/or IPv6 addresses, depending on its support for IPv4 and IPv6." OBJECT natSessionPublicSrcAddr SYNTAX InetAddress (SIZE(4|16)) DESCRIPTION "An implementation is required to support global IPv4 and/or IPv6 addresses, depending on its support for IPv4 and IPv6." OBJECT natSessionPublicDstAddr SYNTAX InetAddress (SIZE(4|16)) DESCRIPTION "An implementation is required to support global IPv4 and/or IPv6 addresses, depending on its support for IPv4 and IPv6." ::= { natMIBCompliances 1 } natMIBReadOnlyCompliance MODULE-COMPLIANCE STATUS current DESCRIPTION "When this MIB is implemented without support for read-create (i.e., in read-only mode), then such an implementation can claim read-only compliance. Such a device can then be monitored but cannot be configured with this MIB. The following index objects cannot be added as OBJECT clauses but nevertheless have the compliance requirements: " -- OBJECT natAddrBindLocalAddrType -- SYNTAX InetAddressType { ipv4(1), ipv6(2) } -- DESCRIPTION -- "An implementation is required to support -- global IPv4 and/or IPv6 addresses, depending Perreault & Tsou Expires March 8, 2012 [Page 64] Internet-Draft NAT-MIB-bis September 2011 -- on its support for IPv4 and IPv6." -- OBJECT natAddrBindLocalAddr -- SYNTAX InetAddress (SIZE(4|16)) -- DESCRIPTION -- "An implementation is required to support -- global IPv4 and/or IPv6 addresses, depending -- on its support for IPv4 and IPv6." -- OBJECT natAddrPortBindLocalAddrType -- SYNTAX InetAddressType { ipv4(1), ipv6(2) } -- DESCRIPTION -- "An implementation is required to support -- global IPv4 and/or IPv6 addresses, depending -- on its support for IPv4 and IPv6." -- OBJECT natAddrPortBindLocalAddr -- SYNTAX InetAddress (SIZE(4|16)) -- DESCRIPTION -- "An implementation is required to support -- global IPv4 and/or IPv6 addresses, depending -- on its support for IPv4 and IPv6." MODULE IF-MIB -- The interfaces MIB, RFC2863 MANDATORY-GROUPS { ifCounterDiscontinuityGroup } MODULE -- this module MANDATORY-GROUPS { natConfigGroup, natTranslationGroup, natStatsInterfaceGroup } GROUP natStatsProtocolGroup DESCRIPTION "This group is optional." GROUP natStatsAddrMapGroup DESCRIPTION "This group is optional." GROUP natMIBNotificationGroup DESCRIPTION "This group is optional." OBJECT natInterfaceRowStatus SYNTAX RowStatus { active(1) } MIN-ACCESS read-only DESCRIPTION "Write access is not required, and active is the only status that needs to be supported." Perreault & Tsou Expires March 8, 2012 [Page 65] Internet-Draft NAT-MIB-bis September 2011 OBJECT natAddrMapLocalAddrType SYNTAX InetAddressType { ipv4(1), ipv6(2) } MIN-ACCESS read-only DESCRIPTION "Write access is not required. An implementation is required to support global IPv4 and/or IPv6 addresses, depending on its support for IPv4 and IPv6." OBJECT natAddrMapLocalAddrFrom SYNTAX InetAddress (SIZE(4|16)) MIN-ACCESS read-only DESCRIPTION "Write access is not required. An implementation is required to support global IPv4 and/or IPv6 addresses, depending on its support for IPv4 and IPv6." OBJECT natAddrMapLocalAddrTo SYNTAX InetAddress (SIZE(4|16)) MIN-ACCESS read-only DESCRIPTION "Write access is not required. An implementation is required to support global IPv4 and/or IPv6 addresses, depending on its support for IPv4 and IPv6." OBJECT natAddrMapGlobalAddrType SYNTAX InetAddressType { ipv4(1), ipv6(2) } MIN-ACCESS read-only DESCRIPTION "Write access is not required. An implementation is required to support global IPv4 and/or IPv6 addresses, depending on its support for IPv4 and IPv6." OBJECT natAddrMapGlobalAddrFrom SYNTAX InetAddress (SIZE(4|16)) MIN-ACCESS read-only DESCRIPTION "Write access is not required. An implementation is required to support global IPv4 and/or IPv6 addresses, depending on its support for IPv4 and IPv6." OBJECT natAddrMapGlobalAddrTo SYNTAX InetAddress (SIZE(4|16)) MIN-ACCESS read-only DESCRIPTION "Write access is not required. An implementation is required to support global IPv4 and/or IPv6 addresses, depending on its support for IPv4 and IPv6." Perreault & Tsou Expires March 8, 2012 [Page 66] Internet-Draft NAT-MIB-bis September 2011 OBJECT natAddrMapRowStatus SYNTAX RowStatus { active(1) } MIN-ACCESS read-only DESCRIPTION "Write access is not required, and active is the only status that needs to be supported." OBJECT natAddrBindGlobalAddrType SYNTAX InetAddressType { ipv4(1), ipv6(2) } DESCRIPTION "An implementation is required to support global IPv4 and/or IPv6 addresses, depending on its support for IPv4 and IPv6." OBJECT natAddrBindGlobalAddr SYNTAX InetAddress (SIZE(4|16)) DESCRIPTION "An implementation is required to support global IPv4 and/or IPv6 addresses, depending on its support for IPv4 and IPv6." OBJECT natAddrPortBindGlobalAddrType SYNTAX InetAddressType { ipv4(1), ipv6(2) } DESCRIPTION "An implementation is required to support global IPv4 and/or IPv6 addresses, depending on its support for IPv4 and IPv6." OBJECT natAddrPortBindGlobalAddr SYNTAX InetAddress (SIZE(4|16)) DESCRIPTION "An implementation is required to support global IPv4 and/or IPv6 addresses, depending on its support for IPv4 and IPv6." OBJECT natSessionPrivateAddrType SYNTAX InetAddressType { ipv4(1), ipv6(2) } DESCRIPTION "An implementation is required to support global IPv4 and/or IPv6 addresses, depending on its support for IPv4 and IPv6." OBJECT natSessionPrivateSrcAddr SYNTAX InetAddress (SIZE(4|16)) DESCRIPTION "An implementation is required to support global IPv4 and/or IPv6 addresses, depending on its support for IPv4 and IPv6." Perreault & Tsou Expires March 8, 2012 [Page 67] Internet-Draft NAT-MIB-bis September 2011 OBJECT natSessionPrivateDstAddr SYNTAX InetAddress (SIZE(4|16)) DESCRIPTION "An implementation is required to support global IPv4 and/or IPv6 addresses, depending on its support for IPv4 and IPv6." OBJECT natSessionPublicAddrType SYNTAX InetAddressType { ipv4(1), ipv6(2) } DESCRIPTION "An implementation is required to support global IPv4 and/or IPv6 addresses, depending on its support for IPv4 and IPv6." OBJECT natSessionPublicSrcAddr SYNTAX InetAddress (SIZE(4|16)) DESCRIPTION "An implementation is required to support global IPv4 and/or IPv6 addresses, depending on its support for IPv4 and IPv6." OBJECT natSessionPublicDstAddr SYNTAX InetAddress (SIZE(4|16)) DESCRIPTION "An implementation is required to support global IPv4 and/or IPv6 addresses, depending on its support for IPv4 and IPv6." ::= { natMIBCompliances 2 } END 7. Acknowledgements The authors would like to thank R. Rohit, P. Srisuresh, Rajiv Raghunarayan, Nalinksh Pai, and Cliff Wang, the original authors of [RFC4008], as well as the following individuals who have participated in the drafting, review, and discussion of this memo: Cathy Zhou, Juergen Schoenwaelder, Marc Blanchet, and Yu Fu. 8. Security Considerations [To be reviewed, note about large number of mappings/bindings] It is clear that this MIB can potentially be useful for configuration. Unauthorized access to the write-able objects could cause a denial of service and/or widespread network disturbance. Perreault & Tsou Expires March 8, 2012 [Page 68] Internet-Draft NAT-MIB-bis September 2011 Hence, the support for SET operations in a non-secure environment without proper protection can have a negative effect on network operations. At this writing, no security holes have been identified beyond those that SNMP Security is itself intended to address. These relate primarily to controlled access to sensitive information and the ability to configure a device - or which might result from operator error, which is beyond the scope of any security architecture. There are a number of managed objects in this MIB that may contain information that may be sensitive from a business perspective, in that they may represent NAT bind and session information. The NAT bind and session objects reveal the identity of private hosts that are engaged in a session with external end nodes. A curious outsider could monitor these two objects to assess the number of private hosts being supported by the NAT device. Further, a disgruntled former employee of an enterprise could use the NAT bind and session information to break into specific private hosts by intercepting the existing sessions or originating new sessions into the host. There are no objects that are sensitive in their own right, such as passwords or monetary amounts. It may even be important to control GET access to these objects and possibly to encrypt the values of these objects when they are sent over the network via SNMP. Not all versions of SNMP provide features for such a secure environment. SNMP versions prior to SNMPv3 did not include adequate security. Even if the network itself is secure (for example by using IPSec), even then, there is no control as to who on the secure network is allowed to access and GET/SET (read/change/create/delete) the objects in this MIB. It is recommended that the implementers consider the security features as provided by the SNMPv3 framework (see [RFC3410], section 8), including full support for the SNMPv3 cryptographic mechanisms (for authentication and privacy). Further, deployment of SNMP versions prior to SNMPv3 is NOT RECOMMENDED. Instead, it is RECOMMENDED to deploy SNMPv3 and to enable cryptographic security. It is then a customer/operator responsibility to ensure that the SNMP entity giving access to an instance of this MIB module is properly configured to give access to the objects only to those principals (users) that have legitimate rights to indeed GET or SET (change/create/delete) them. Perreault & Tsou Expires March 8, 2012 [Page 69] Internet-Draft NAT-MIB-bis September 2011 9. IANA Considerations TBD 10. References 10.1. Normative References [RFC2578] McCloghrie, K., Ed., Perkins, D., Ed., and J. Schoenwaelder, Ed., "Structure of Management Information Version 2 (SMIv2)", STD 58, RFC 2578, April 1999. [RFC2579] McCloghrie, K., Ed., Perkins, D., Ed., and J. Schoenwaelder, Ed., "Textual Conventions for SMIv2", STD 58, RFC 2579, April 1999. [RFC2580] McCloghrie, K., Perkins, D., and J. Schoenwaelder, "Conformance Statements for SMIv2", STD 58, RFC 2580, April 1999. [RFC3022] Srisuresh, P. and K. Egevang, "Traditional IP Network Address Translator (Traditional NAT)", RFC 3022, January 2001. [RFC2663] Srisuresh, P. and M. Holdrege, "IP Network Address Translator (NAT) Terminology and Considerations", RFC 2663, August 1999. [RFC4001] Daniele, M., Haberman, B., Routhier, S., and J. Schoenwaelder, "Textual Conventions for Internet Network Addresses", RFC 4001, February 2005. [RFC0792] Postel, J., "Internet Control Message Protocol", STD 5, RFC 792, September 1981. [RFC3489] Rosenberg, J., Weinberger, J., Huitema, C., and R. Mahy, "STUN - Simple Traversal of User Datagram Protocol (UDP) Through Network Address Translators (NATs)", RFC 3489, March 2003. [RFC2863] McCloghrie, K. and F. Kastenholz, "The Interfaces Group MIB", RFC 2863, June 2000. [RFC2463] Conta, A. and S. Deering, "Internet Control Message Protocol (ICMPv6) for the Internet Protocol Version 6 (IPv6) Specification", RFC 2463, December 1998. [RFC3411] Harrington, D., Presuhn, R., and B. Wijnen, "An Perreault & Tsou Expires March 8, 2012 [Page 70] Internet-Draft NAT-MIB-bis September 2011 Architecture for Describing Simple Network Management Protocol (SNMP) Management Frameworks", STD 62, RFC 3411, December 2002. [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC3413] Levi, D., Meyer, P., and B. Stewart, "Simple Network Management Protocol (SNMP) Applications", STD 62, RFC 3413, December 2002. 10.2. Informative References [RFC1918] Rekhter, Y., Moskowitz, R., Karrenberg, D., Groot, G., and E. Lear, "Address Allocation for Private Internets", BCP 5, RFC 1918, February 1996. [RFC3410] Case, J., Mundy, R., Partain, D., and B. Stewart, "Introduction and Applicability Statements for Internet- Standard Management Framework", RFC 3410, December 2002. [RFC4008] Rohit, R., Srisuresh, P., Raghunarayan, R., Pai, N., and C. Wang, "Definitions of Managed Objects for Network Address Translators (NAT)", RFC 4008, March 2005. [RFC6333] Durand, A., Droms, R., Woodyatt, J., and Y. Lee, "Dual- Stack Lite Broadband Deployments Following IPv4 Exhaustion", RFC 6333, August 2011. Authors' Addresses Simon Perreault Viagenie 2875 boul. Laurier, suite D2-630 Quebec Canada Phone: +1-418-656-9254 EMail: simon.perreault@viagenie.ca Perreault & Tsou Expires March 8, 2012 [Page 71] Internet-Draft NAT-MIB-bis September 2011 Tina Tsou Huawei Technologies 2330 Central Expressway Santa Clara USA Phone: +1-408-330-4424 EMail: tena@huawei.com Perreault & Tsou Expires March 8, 2012 [Page 72]