NAT Working Group R. Rohit INTERNET-DRAFT Mascon Global Limited Expires October 2004 P. Srisuresh Caymas Systems, Inc. R. Raghunarayan N. Pai Cisco Systems, Inc. C. Wang Bank One Corp April 2004 Definitions of Managed Objects for Network Address Translators (NAT) Status of this Memo This document is an Internet-Draft and is in full conformance with all provisions of Section 10 of RFC2026. 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. Copyright Notice Copyright (C), 2004, The Internet Society. All Rights Reserved. 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. Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 1] INTERNET-DRAFT NAT MIB April 2004 Table of Contents 1 Introduction ................................................2 2 The Internet-Standard Management Framework ..................2 3 Terminology .................................................3 4 Overview ....................................................4 4.1 natInterfaceTable............................................4 4.2 natAddrMapTable..............................................5 4.3 Default timeouts, Protocol table and other scalars...........5 4.4 natAddrBindTable and natAddrPortBindTable....................6 4.5 natSessionTable..............................................6 4.6 RFC 3489 NAPT variations, NAT session and Bind tables........6 4.7 Notifications................................................7 4.8 Relation among tables........................................8 4.9 Configuration via the MIB....................................8 4.10 Relationship to Interface MIB................................9 5 Definitions .................................................10 6 Intellectual Property........................................61 7 Change History...............................................62 8 Acknowledgements ............................................64 9 Security Considerations .....................................64 10 References ..................................................65 11 Author's Addresses ..........................................66 12 Full Copyright Statement.....................................67 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 as well as monitoring of a device capable of NAT function. This MIB does not address the firewall functions and must not be used for configuring or monitoring the same. Section 2 provides references to the SNMP management framework, which was used as the basis for the MIB module definition. Section 3 describes the terms used throughout the document. Section 4 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 5 has the complete NAT MIB definition. 2. 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 RFC 3410 [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). Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 2] INTERNET-DRAFT NAT MIB April 2004 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]. 3. Terminology Definitions for majority of the terms used throughout the document may be found in RFC 2663 [RFC2663]. Additional terms that further classify NAPT implementations are defined in RFC 3489 [RFC3489]. Listed below are terms used in this document. Symmetric NAT - Symmetric NAT, as defined in RFC 3489 [RFC3489] is a variation of Network Address Port Translator (NAPT) in that 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 or not. Bind - Several variations of the term 'bind' are used throughout the document. Address-bind is a tuple of (Private IP address, Public IP Address) used for translating an IP address end-point in IP packets. Address-port-bind (or simply, Port-bind) 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 one of address-bind or port-bind. Bind-Mode identifies whether a bind is address-bind or port-bind. 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. 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. Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 3] INTERNET-DRAFT NAT MIB April 2004 4. Overview NAT MIB is configurable on 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 one of private or 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 which must to 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. 4.1 natInterfaceTable 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, namely Basic-NAT, NAPT, twice NAT and bidirectional NAT. These are NAT varieties as defined in RFC 2663 [RFC2663]. Note, RFC 3489 [RFC3489] further classifies NAPT implementations based on the behavior exhibited by the NAPT devices Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 4] INTERNET-DRAFT NAT MIB April 2004 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 4.6. 4.2 natAddrMapTable 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 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. 4.3 Default timeouts, Protocol table and other scalars 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. natProtocolTable 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. Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 5] INTERNET-DRAFT NAT MIB April 2004 The generation of natPacketDiscard notifications can be configured using the natNotifThrottlingInterval scalar MIB object. 4.4 natAddrBindTable and natAddrPortBindTable Two Bind tables, natAddrBindTable and natAddrPortBindTable, are defined to hold the bind entries. Entries in the bind tables 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. 4.5 natSessionTable 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. NAT session provides the necessary translation glue between two session representations of the same end-to-end session. I.e., a session as seen in the private realm and the same session as seen in the public realm. Session orientation (inbound or outbound) is determined from the orientation of the first packet traversing NAT interface. Address map entries and bind entries on the interface determine whether or not 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 so 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. 4.6 RFC 3489 NAPT variations, NAT session and Bind tables [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. Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 6] INTERNET-DRAFT NAT MIB April 2004 In a Port-restricted Cone NAT, NAT-session objects will contain non-zero PrivateSrcEPBindId object. Further, all address and port objects within a NAT session will have non-zero values (i.e., no wild card matches). An address-restricted Cone NAT may have been implemented same as 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 same as Port-restricted Cone NAT, except that the UDP NAT-sessions may use ANY match on PrivateDstAddr, PrivateDstPort, PublicDstAddr and PublicDstPort objects i.e., All four of these objects within a NAT session 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-directional, i.e., as a bit mask of (outboundSrcEndPoint and inboundDstEndPoint) or (inboundSrcEndPoint and outboundDstEndPoint), depending upon 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. 4.7 Notifications natPacketDiscard notifies the end user/manager of packets being discarded due to lack of address mappings. Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 7] INTERNET-DRAFT NAT MIB April 2004 4.8 Relation among tables The association between the various NAT tables can be represented as follows. Interface | | | Address map | | | ---------------------------------------------- | | | | | | Address Bind Address Port Bind | | | | | | ---------------------------------------------- | | | 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. 4.9 Configuration via the MIB Sections 4.1, 4.2 and part of section 4.3 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. Symmetric NAT 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: Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 8] INTERNET-DRAFT NAT MIB April 2004 - Create an entry in the natInterfaceTable specifying the 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 Section 4.1). - 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 specified for the entry in the natInterfaceTable (refer section 4.2). - Configure maximum permitted idle time duration for BINDs and TCP, UDP and ICMP protocol sessions by setting the relevant scalars in natDefTimeouts object (refer section 4.3). 4.10 Relationship to Interface MIB The natInterfaceTable specifies the NAT configuration attributes on each interface. The concept of "interface" is as defined by InterfaceIndex/ifIndex of the IETF Interfaces MIB [IF-MIB]. Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 9] INTERNET-DRAFT NAT MIB April 2004 5. Definitions 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 "200404180000Z" ORGANIZATION "Individuals" CONTACT-INFO " Rohit Mascon Global Limited #59/2 100 ft Ring Road Banashankari II Stage Bangalore 560 070 India Phone: +91 80 2679 6227 Email: rrohit74@hotmail.com Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 10] INTERNET-DRAFT NAT MIB April 2004 P. Srisuresh Caymas Systems, Inc. 1179-A North McDowell Blvd. Petaluma, CA 94954 Tel: (707) 283-5063 Email: srisuresh@yahoo.com Rajiv Raghunarayan Cisco Systems Inc. 170 West Tasman Drive San Jose, CA 95134 Phone: +1 408 853 9612 Email: raraghun@cisco.com Nalinaksh Pai Cisco Systems, Inc. Prestige Waterford No. 9, Brunton Road Bangalore - 560 025 India Phone: +91 80 532 1300 Email: npai@cisco.com Cliff Wang Information Security Bank One Corp 1111 Polaris Pkwy Columbus, OH 43240 Phone: +1 614 213 6117 Email: cliffwang2000@yahoo.com " DESCRIPTION "This MIB module defines the generic managed objects for NAT. Copyright (C) The Internet Society (2004). This version of this MIB module is part of RFC yyyy; see the RFC itself for full legal notices." -- RFC Ed.: replace yyyy with actual RFC number & remove this note REVISION "200404180000Z" -- 18th April 2004 DESCRIPTION "Initial version, published as RFC yyyy." -- RFC Ed.: replace yyyy with actual RFC number & remove this note ::= { mib-2 XXX } -- RFC Ed.: replace XXX with IANA-assigned -- number & remove this note natMIBObjects OBJECT IDENTIFIER ::= { natMIB 1 } Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 11] INTERNET-DRAFT NAT MIB April 2004 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 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) 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 case of a Symmetric NAT." SYNTAX Unsigned32 (0..4294967295) Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 12] INTERNET-DRAFT NAT MIB April 2004 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" 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 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 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) } Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 13] INTERNET-DRAFT NAT MIB April 2004 -- -- Default Values for the Bind and NAT Protocol Timers -- natDefTimeouts OBJECT IDENTIFIER ::= { natMIBObjects 1 } natNotifCtrl OBJECT IDENTIFIER ::= { natMIBObjects 2 } -- -- 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 } Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 14] INTERNET-DRAFT NAT MIB April 2004 -- -- ICMP related NAT configuration -- natIcmpDefIdleTimeout OBJECT-TYPE SYNTAX Unsigned32 (1..4294967295) UNITS "seconds" MAX-ACCESS read-write STATUS current 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 } Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 15] INTERNET-DRAFT NAT MIB April 2004 -- -- TCP related NAT Timers -- natTcpDefIdleTimeout OBJECT-TYPE SYNTAX Unsigned32 (1..4294967295) UNITS "seconds" MAX-ACCESS read-write STATUS current DESCRIPTION "The default time interval, 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 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, a NAT session for a TCP connection which 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 } Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 16] INTERNET-DRAFT NAT MIB April 2004 natNotifThrottlingInterval OBJECT-TYPE SYNTAX Integer32 (0 | 5..3600) UNITS "seconds" MAX-ACCESS read-write STATUS current DESCRIPTION "This object controls the generation of 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 natPacketDiscard 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 } Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 17] INTERNET-DRAFT NAT MIB April 2004 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 procedures applicable to that, 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, natInterfaceOutTranslates Counter64, natInterfaceDiscards Counter64, natInterfaceStorageType StorageType, natInterfaceRowStatus RowStatus } 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 } Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 18] INTERNET-DRAFT NAT MIB April 2004 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 } 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 } Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 19] INTERNET-DRAFT NAT MIB April 2004 natInterfaceDiscards OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "Number of packets that had to be rejected/dropped due to 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. 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 } Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 20] INTERNET-DRAFT NAT MIB April 2004 -- -- 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 } ::= { 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 } Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 21] INTERNET-DRAFT NAT MIB April 2004 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 SYNTAX NatAssociationType MAX-ACCESS read-create STATUS current DESCRIPTION "This parameter can be used to set up static or dynamic address maps." ::= { natAddrMapEntry 3 } Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 22] INTERNET-DRAFT NAT MIB April 2004 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 map 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 map 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." ::= { natAddrMapEntry 5 } Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 23] INTERNET-DRAFT NAT MIB April 2004 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 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 } Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 24] INTERNET-DRAFT NAT MIB April 2004 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 } Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 25] INTERNET-DRAFT NAT MIB April 2004 natAddrMapGlobalAddrTo OBJECT-TYPE 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 } Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 26] INTERNET-DRAFT NAT MIB April 2004 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. 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." Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 27] INTERNET-DRAFT NAT MIB April 2004 ::= { natAddrMapEntry 17 } natAddrMapDiscards 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 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 case of 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 } Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 28] INTERNET-DRAFT NAT MIB April 2004 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'. 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 } Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 29] INTERNET-DRAFT NAT MIB April 2004 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." 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. As this object is used in the index for the natAddrBindTable, implementers of this table should be careful not to create entries that would result in OIDs with more than 128 subidentifiers; else the information Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 30] INTERNET-DRAFT NAT MIB April 2004 cannot be accessed using SNMPv1, SNMPv2c or SNMPv3." ::= { natAddrBindEntry 2 } natAddrBindGlobalAddrType OBJECT-TYPE SYNTAX InetAddressType MAX-ACCESS read-only STATUS current DESCRIPTION "This object specifies the address type used for natAddrBindGlobalAddr." ::= { 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 } Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 31] INTERNET-DRAFT NAT MIB April 2004 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 } 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. If the bind is being created by the Management Station, then it should set the value for this object to point to an existing address map entry. An attempt to set this object to a nonexistent address map entry will result in an inconsistentValue error." ::= { natAddrBindEntry 8 } Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 32] INTERNET-DRAFT NAT MIB April 2004 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 of time, this object indicates the time that this bind has been idle with no 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 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 } Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 33] INTERNET-DRAFT NAT MIB April 2004 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 } -- -- 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." INDEX { ifIndex, natAddrPortBindLocalAddrType, natAddrPortBindLocalAddr, natAddrPortBindLocalPort, natAddrPortBindProtocol } ::= { natAddrPortBindTable 1 } Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 34] INTERNET-DRAFT NAT MIB April 2004 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, 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. As this object is used in the index for the natAddrPortBindTable, implementers of this table should be careful not to create entries that would result in OIDs with more than 128 subidentifiers; else the information cannot be accessed using SNMPv1, SNMPv2c or SNMPv3." ::= { natAddrPortBindEntry 2 } Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 35] INTERNET-DRAFT NAT MIB April 2004 natAddrPortBindLocalPort OBJECT-TYPE SYNTAX InetPortNumber MAX-ACCESS not-accessible STATUS current DESCRIPTION "When the protocol is set to TCP or UDP, this object represents the private-realm specific port number. When the protocol is set to ICMP, a bind is created only for query/response type of ICMP messages such as ICMP echo, Timestamp and Information request messages, and the object represents the private-realm specific identifier in the ICMP message, as defined in RFC 792 for ICMPv4 and 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 public realm specific endpoint, as represented by the tuple of (natAddPortBindGlobalPort, 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 Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 36] INTERNET-DRAFT NAT MIB April 2004 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 DESCRIPTION "When the protocol is set to TCP or UDP, this object represents the public-realm specific port number. When the protocol is set to ICMP, a bind is created only for query/response type of ICMP messages such as ICMP echo, Timestamp and Information request messages, and the object represents the public-realm specific identifier in the ICMP message, as defined in RFC 792 for ICMPv4 and 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 ( natAddPortBindLocalPort, 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 using the BIND. Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 37] INTERNET-DRAFT NAT MIB April 2004 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)." ::= { 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) 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. If the bind is being created by the Management Station, then it should set the value for this object to point to an existing address map entry. An attempt to set this object to a nonexistent address map entry will result in an inconsistentValue error." ::= { 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 Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 38] INTERNET-DRAFT NAT MIB April 2004 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." ::= { natAddrPortBindEntry 13 } natAddrPortBindCurrentIdleTime OBJECT-TYPE SYNTAX TimeTicks MAX-ACCESS read-only STATUS current DESCRIPTION "At any given instance of time, this object indicates the time that this bind has been idle with no 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 } Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 39] INTERNET-DRAFT NAT MIB April 2004 -- -- The Session Table -- natSessionTable OBJECT-TYPE SYNTAX SEQUENCE OF NatSessionEntry MAX-ACCESS not-accessible 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 } Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 40] INTERNET-DRAFT NAT MIB April 2004 natSessionIndex OBJECT-TYPE SYNTAX NatSessionId MAX-ACCESS not-accessible STATUS current DESCRIPTION "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) } Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 41] INTERNET-DRAFT NAT MIB April 2004 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) which was 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. If the session is being created by the Management Station, then it should set the value for this object to point to an existing address map entry. An attempt to set this object to a nonexistent address map entry will result in an inconsistentValue error." ::= { 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." Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 42] INTERNET-DRAFT NAT MIB April 2004 ::= { natSessionEntry 10 } 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 can only be set to zero when natSessionPrivateSrcEPBindId object has zero value. When set to 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 protocol is set to TCP or UDP, this object represents the source port in the first packet of session while in private-realm. When the protocol is set to ICMP, a NAT session is created only for query/response type of 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 RFC 2463 for ICMPv6. The value of this object can only be set to zero when natSessionPrivateSrcEPBindId object has zero value and natSessionPrivateSrcEPBindMode is set to addressPortBind(2). When set to zero, 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 } Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 43] INTERNET-DRAFT NAT MIB April 2004 natSessionPrivateDstAddr OBJECT-TYPE SYNTAX InetAddress MAX-ACCESS read-only STATUS current DESCRIPTION "The destination IP address of the session endpoint that lies in the private network. The value of this object can only be set to zero when natSessionPrivateDstEPBindId object has zero value. When set to 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 13 } natSessionPrivateDstPort OBJECT-TYPE SYNTAX InetPortNumber MAX-ACCESS read-only STATUS current DESCRIPTION "When the protocol is set to TCP or UDP, this object represents the destination port in the first packet of session while in private-realm. When the protocol is set to ICMP, this object is not relevant and should be set to zero. The value of this object can only be set to zero when natSessionPrivateDstEPBindId object has zero value and natSessionPrivateDstEPBindMode is set to addressPortBind(2). When set to zero, 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 } Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 44] INTERNET-DRAFT NAT MIB April 2004 natSessionPublicSrcAddr OBJECT-TYPE SYNTAX InetAddress MAX-ACCESS read-only STATUS current DESCRIPTION "The source IP address of the session endpoint that lies in the public network. The value of this object can only be set to zero when natSessionPrivateSrcEPBindId object has zero value. When set to 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 natSessionPublicAddrType object." ::= { natSessionEntry 16 } natSessionPublicSrcPort OBJECT-TYPE SYNTAX InetPortNumber MAX-ACCESS read-only STATUS current DESCRIPTION "When the protocol is set to TCP or UDP, this object represents the source port in the first packet of session while in public-realm. When the protocol is set to ICMP, a NAT session is created only for query/response type of 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 RFC 2463 for ICMPv6. The value of this object can only be set to zero when natSessionPrivateSrcEPBindId object has zero value and natSessionPrivateSrcEPBindMode is set to addressPortBind(2). When set to zero, 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 lies in the public network. Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 45] INTERNET-DRAFT NAT MIB April 2004 The value of this object MUST not be set to zero when natSessionPrivateDstEPBindId object has 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 protocol is set to TCP or UDP, this object represents the destination port in the first packet of session while in public-realm. When the protocol is set to ICMP, this object is not relevant for translation and should be set to zero. The value of this object can only be set to zero when natSessionPrivateDstEPBindId object has zero value and natSessionPrivateDstEPBindMode is set to addressPortBind(2). When set to zero, 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 MAX-ACCESS read-only STATUS current DESCRIPTION "The time since a packet belonging to this session was last detected." ::= { natSessionEntry 21 } Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 46] INTERNET-DRAFT NAT MIB April 2004 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 } 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 } Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 47] INTERNET-DRAFT NAT MIB April 2004 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. 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 } Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 48] INTERNET-DRAFT NAT MIB April 2004 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 } -- -- 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 } Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 49] INTERNET-DRAFT NAT MIB April 2004 -- -- Units of conformance -- natConfigGroup OBJECT-GROUP OBJECTS { natInterfaceRealm, natInterfaceServiceType, natInterfaceStorageType, natInterfaceRowStatus, natAddrMapName, natAddrMapEntryType, natAddrMapTranslationEntity, natAddrMapLocalAddrType, natAddrMapLocalAddrFrom, natAddrMapLocalAddrTo, natAddrMapLocalPortFrom, natAddrMapLocalPortTo, natAddrMapGlobalAddrType, natAddrMapGlobalAddrFrom, natAddrMapGlobalAddrTo, natAddrMapGlobalPortFrom, natAddrMapGlobalPortTo, natAddrMapProtocol, natAddrMapStorageType, natAddrMapRowStatus, 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 } Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 50] INTERNET-DRAFT NAT MIB April 2004 natTranslationGroup OBJECT-GROUP OBJECTS { natAddrBindNumberOfEntries, natAddrBindGlobalAddrType, 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 Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 51] INTERNET-DRAFT NAT MIB April 2004 DESCRIPTION "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 } 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 which are generated by devices supporting this MIB." ::= { natMIBGroups 6 } -- -- Compliance statements -- Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 52] INTERNET-DRAFT NAT MIB April 2004 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 -- upon 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 -- upon 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 -- upon 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 -- upon its support for IPv4 and IPv6." MODULE IF-MIB -- The interfaces MIB, RFC2863 MANDATORY-GROUPS { ifCounterDiscontinuityGroup } MODULE -- this module MANDATORY-GROUPS { natConfigGroup, natTranslationGroup, natStatsInterfaceGroup } Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 53] INTERNET-DRAFT NAT MIB April 2004 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 upon 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 upon 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 upon 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 upon 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 upon its support for IPv4 and IPv6." OBJECT natAddrMapGlobalAddrTo SYNTAX InetAddress (SIZE(4|16)) DESCRIPTION "An implementation is required to support global IPv4 Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 54] INTERNET-DRAFT NAT MIB April 2004 and/or IPv6 addresses depending upon 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 upon 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 upon 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 upon 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 upon 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 upon 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 upon its support for IPv4 and IPv6." OBJECT natSessionPrivateDstAddr SYNTAX InetAddress (SIZE(4|16)) DESCRIPTION "An implementation is required to support global IPv4 Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 55] INTERNET-DRAFT NAT MIB April 2004 and/or IPv6 addresses depending upon 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 upon 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 upon 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 upon 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 can not 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 -- upon its support for IPv4 and IPv6." -- OBJECT natAddrBindLocalAddr -- SYNTAX InetAddress (SIZE(4|16)) Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 56] INTERNET-DRAFT NAT MIB April 2004 -- DESCRIPTION -- "An implementation is required to support -- global IPv4 and/or IPv6 addresses depending -- upon 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 -- upon 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 -- upon 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." OBJECT natAddrMapLocalAddrType SYNTAX InetAddressType { ipv4(1), ipv6(2) } MIN-ACCESS read-only Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 57] INTERNET-DRAFT NAT MIB April 2004 DESCRIPTION "Write access is not required. An implementation is required to support global IPv4 and/or IPv6 addresses depending upon 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 upon 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 upon 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 upon 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 upon 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 upon its support for IPv4 and IPv6." OBJECT natAddrMapRowStatus SYNTAX RowStatus { active(1) } MIN-ACCESS read-only Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 58] INTERNET-DRAFT NAT MIB April 2004 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 upon 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 upon 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 upon 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 upon 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 upon 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 upon its support for IPv4 and IPv6." OBJECT natSessionPrivateDstAddr SYNTAX InetAddress (SIZE(4|16)) Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 59] INTERNET-DRAFT NAT MIB April 2004 DESCRIPTION "An implementation is required to support global IPv4 and/or IPv6 addresses depending upon 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 upon 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 upon 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 upon its support for IPv4 and IPv6." ::= { natMIBCompliances 2 } END Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 60] INTERNET-DRAFT NAT MIB April 2004 6. Intellectual Property The IETF takes no position regarding the validity or scope of any intellectual property or other rights that might be claimed to pertain to the implementation or use of the technology described in this document or the extent to which any license under such rights might or might not be available; neither does it represent that it has made any effort to identify any such rights. Information on the IETF's procedures with respect to rights in standards-track and standards-related documentation can be found in BCP-11. Copies of claims of rights made available for publication and any assurances of licenses to be made available, or the result of an attempt made to obtain a general license or permission for the use of such proprietary rights by implementers or users of this specification can be obtained from the IETF Secretariat. The IETF invites any interested party to bring to its attention any copyrights, patents or patent applications, or other proprietary rights that may cover technology that may be required to practice this standard. Please address the information to the IETF Executive Director. Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 61] INTERNET-DRAFT NAT MIB April 2004 RFC Editor: Please remove the following section & remove this note 7. Change History A record of changes which will be removed before publication. 10 September 2001 o Added the following objects to support notifications: natAddrRiseThreshold, natAddrFallingThreshold, natAddrMapName and natPktDiscardReason. o Following notifications were added (there are still some unclear parameters though): natAddressUseRising and natPacketDiscard. 10 November 2001 o Dynamic and Static Address Map tables are Merged. o Protocol Extensibility added. o Rearrangement of OIDs done to get things in proper sequence. 07 February 2002 o Config and Interface Specific tables are Merged. o MAX-ACCESS for the bind and session entry objects are changed to be read-create. o natAddrMapType renamed to natAddrMapDirection. 14 June 2002 o Changed the syntax of natConfServiceType to BITS and renumbered the enumeration to start with 0. o Addressed the warning raised by smilint - all InetAddress values now restricted to the size range (0..20) i.e. valid InetAddress types are now ipv4, ipv6, ipv4z and ipv6z. o MIN-ACCESS for natConfInterfaceRealm restricted to read-only. o Changed the natConfIcmpDefIdleTimeout default value to be 300. o natConfProtConfigName made a part of the optional natConfProtGroup. Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 62] INTERNET-DRAFT NAT MIB April 2004 o RFC 3291 now referred to instead of RFC 2578 2 Nov 2002 o Added the Bind Origin Objects. o Updated the description of natSessionSecondBindId. o Interface specific statistics made mandatory. o New sections, 4.1, 4.2 and 4.3 added indicating relationship between tables and configuration guidelines. 02 Sep 2003 o Removed the protocol extensibility. o Incorporated other comments. 21 Oct 2003 o Rearranged notifications o Added new TEXTUAL-CONVENTIONs. 27 Oct 2003 o Updated MODULE IDENTITY according to the MIB guidelines. 18 Apr 2004 o Updated the mib, based on feedback from IESG. o MAX-ACCESS for the bind and session entry objects are changed to be read-only. o Added a statement to the intro section indicating the scope of the MIB is restricted to NAT only; does not cover Firewall MIB. o Portions of Section 4 re-written, to read in active voice. o Added Bind timeout parameter as a configurable parameter. o Added a new section, 4.6, to describe the relation between RFC 3489 defined NAPT variations and the entries in the Bind and Session tables. Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 63] INTERNET-DRAFT NAT MIB April 2004 o Referring to 3291bis, instead of 3291 for the definition of InetAddress TC. 8. Acknowledgements The authors of the document would like to thank Randy Turner, Ashwini S.T., Kevin Luehrs, Sam Sankoorikal, and Juergen Quittek for their valuable feedback. The authors would like to especially thank Juergen Schoenwaelder for his patient and fine-combed review and detailed comments as a MIB doctor. The NAT MIB is much clearer and flatter as a result of Juergen's suggestions. 9. Security Considerations It is clear that this MIB can be potentially useful for configuration. Unauthorized access to the write-able objects could cause a denial of service, and/or widespread network disturbance. 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 originate new sessions into the host. There are no objects which are sensitive in their own right, such as passwords or monetary amounts. It may be important to even control GET access to these objects and possibly to even encrypt the values of these objects when sending them over the network via SNMP. Not all versions of SNMP provide features for such a secure environment. Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 64] INTERNET-DRAFT NAT MIB April 2004 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. 10. References 10.1. Normative References [RFC2578] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J., Rose, M. and S. Waldbusser, "Structure of Management Information Version 2 (SMIv2)", STD 58, RFC 2578, April 1999. [RFC2579] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J., Rose, M. and S. Waldbusser, "Textual Conventions for SMIv2", STD 58, RFC 2579, April 1999. [RFC2580] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J., Rose, M. and S. Waldbusser, "Conformance Statements for SMIv2", STD 58, RFC 2580, April 1999. [RFC3022] Srisuresh, P. and Egevang, K., "Traditional IP Network Address Translator (Traditional NAT)", RFC 3022, January 2001. [RFC2663] Srisuresh, P. and M. Holdrege, "NAT Terminology and Considerations", RFC 2663, August 1999. [3291bis] Daniele, M., Haberman, B., Routhier, S., Schoenwaelder, J., "Textual Conventions for Internet Network Addresses", RFC XXXX, Month Year. (Work in Progress) -- RFC Ed.: Update when the 3291-bis gets a RFC number. [RFC792] J. Postel, "Internet Control Message Protocol - DARPA Internet Program Protocol Specification", RFC 792, September 1981. Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 65] INTERNET-DRAFT NAT MIB April 2004 [RFC3489] J. Rosenberg, J. Weinberger, C. Huitema, and R. Mahy, "STUN - Simple Traversal of User Datagram Protocol (UDP) Through Network Address Translators (NATs)", RFC 3489, April 2003. [RFC2863] McCloghrie, K. and F. Kastenholz, "The Interfaces Group MIB using SMIv2", RFC 2863, June 2000. [RFC2463] Conta & Deering, "Internet Control Message Protocol (ICMPv6) for the Internet Protocol Version 6 (IPv6) Specification", RFC 2653, December 1998 [RFC3411] Harrington, D., Presuhn, R. and B. Wijnen, "An Architecture for describing Simple Network Management Protocol (SNMP) Management Frameworks", RFC 3411, December 2002. [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", RFC 2119, April 1997. [RFC3413] Levi, D., Meyer, P. and B. Stewart, "Simple Network Management Protocol (SNMP) Applications", RFC 3413, December 2002. 10.2. Informative References [RFC3410] Case, J., Mundy, R., Partain, D. and B. Stewart, "Introduction and Applicability Statements for Internet- Standard Management Framework", RFC 3410, December 2002. 11. Author's Addresses R. Rohit Mascon Global Limted #59/2 100 ft Ring Road Banashankari II Stage Bangalore 560 070 India Phone: +91 80 679 6227 Email: rrohit74@hotmail.com P. Srisuresh Caymas Systems, Inc. 1179-A North McDowell Blvd. Petaluma, CA 94954 Tel: (707) 283-5063 Email: srisuresh@yahoo.com Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 66] INTERNET-DRAFT NAT MIB April 2004 Rajiv Raghunarayan Cisco Systems Inc. 170 West Tasman Drive San Jose, CA 95134 Phone: +1 408 853 9612 Email: raraghun@cisco.com Nalinaksh Pai Cisco Systems, Inc. Prestige Waterford No. 9, Brunton Road Bangalore - 560 025 India Phone: +91 80 532 1300 extn. 6354 Email: npai@cisco.com Cliff Wang Information Security Bank One Corp 1111 Polaris Pkwy Columbus, OH 43240 Phone: +1 614 213 6117 Email: cliffwang2000@yahoo.com Rohit, Srisuresh, Raghunarayan, Pai, Wang [Page 67] INTERNET-DRAFT NAT MIB April 2004 12. Full Copyright Statement Copyright (C) The Internet Society (2004). All Rights Reserved. This document and translations of it may be copied and furnished to others, and derivative works that comment on or otherwise explain it or assist in its implementation may be prepared, copied, published and distributed, in whole or in part, without restriction of any kind, provided that the above copyright notice and this paragraph are included on all such copies and derivative works. However, this document itself may not be modified in any way, such as by removing the copyright notice or references to the Internet Society or other Internet organizations, except as needed for the purpose of developing Internet standards in which case the procedures for copyrights defined in the Internet Standards process must be followed, or as required to translate it into languages other than English. The limited permissions granted above are perpetual and will not be revoked by the Internet Society or its successors or assigns. 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