Transport Area Working Group M. Cotton Internet Draft ICANN Updates: 2780, 4340 (if approved) L. Eggert Intended status: BCP Nokia Expires: May 2009 A. Mankin Johns Hopkins Univ. M. Westerlund Ericsson J. Touch USC/ISI November 3, 2008 IANA Procedures for the Transport Protocol Port Number Space draft-ietf-tsvwg-iana-ports-01.txt Status of this Memo By submitting this Internet-Draft, each author represents that any applicable patent or other IPR claims of which he or she is aware have been or will be disclosed, and any of which he or she becomes aware will be disclosed, in accordance with Section 6 of BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet- Drafts. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html This Internet-Draft will expire on May 3, 2009. Abstract This document defines the IANA procedures for registering port number values for use with the various IETF transport protocols, including Cotton, et al. Expires May 3, 2009 [Page 1] Internet-Draft IANA Port Number Space Procedures November 2008 TCP, UDP, DCCP, and SCTP. It provides clear procedures for the management of the port number registry, which is important for its long-term management. It updates RFC2780 by obsoleting Sections 8 and 9.1 of that RFC, and it updates the IANA allocation procedures for DCCP as defined in RFC4340. Table of Contents 1. Introduction...................................................2 2. Conventions used in this document..............................4 3. Port Number Types..............................................5 3.1. Assigned Port Numbers for Experimentation.................5 4. Principles for Port Number Space Management....................6 4.1. Basic Principles of Port Conservation.....................7 4.2. Principles Specific to Individual Port Number Ranges......8 4.3. New Principles............................................9 5. IANA Procedures for Managing the Port Number Space............10 5.1. Port Number Registration.................................10 5.2. Port Number De-Registration..............................12 5.3. Port Number Re-Use.......................................12 5.4. Port Number Revocation...................................12 5.5. Port Number Transfer.....................................13 5.6. Maintenance Issues.......................................13 6. Port Number Space Requests....................................13 6.1. Request Procedure........................................13 7. Security Considerations.......................................14 8. IANA Considerations...........................................14 9. Acknowledgments...............................................15 10. References...................................................16 10.1. Normative References....................................16 10.2. Informative References..................................16 APPENDIX A: Updates to DCCP Registries...........................19 A.1. DCCP Service Code Registry...............................19 A.1. DCCP Port Numbers Registry.....Error! Bookmark not defined. 1. Introduction The Transmission Control Protocol (TCP) [RFC0793] and the User Datagram Protocol (UDP) [RFC0768] have enjoyed a remarkable success over the decades as the two most widely used transport protocols on the Internet. They have introduced the concept of "ports" as logical entities for Internet communication. Ports serve two purposes: first, they provide a demultiplexing identifier to differentiate transport sessions between the same pair of endpoints, and second, they also identify the application protocol and associated service to which processes bind [I-D.touch-tsvwg-port-guidelines]. Newer Cotton, et al. Expires May 3, 2009 [Page 2] Internet-Draft IANA Port Number Space Procedures November 2008 transport protocols, such as the Stream Control Transmission Protocol (SCTP) [RFC4960] and the Datagram Congestion Control Protocol (DCCP) [RFC4342] have adopted the concept of ports for their communication sessions and use port numbers in the same way as TCP and UDP. Port numbers are the original and most widely used means for application and service identification on the Internet. Ports are 16-bit numbers, and the combination of source and destination port numbers together with the IP addresses of the communicating end systems uniquely identifies a session of a given transport protocol. Port numbers are also known by their corresponding service names such as "telnet" for port number 23 and "http" for port number 80. Hosts running services, hosts accessing services on other hosts, and intermediate devices (such as firewalls and NATs) that restrict services need to agree on which service corresponds to a particular destination port. Although this can be a local decision between the endpoints of a connection, most Internet components use a single, shared view of this association, provided by the Internet Assigned Numbers Authority (IANA) through the port number registry [REGISTRY]. Designers of applications and application-level protocols may apply to IANA for a registered port number for a specific application, and may - after successful registration - assume that no other application will use that service port number for its communication sessions. It is important to note that ownership of registered port numbers remains with IANA. For many years, the allocation and registration of new port number values for use with TCP and UDP have had less than clear guidelines. Information about the registration procedures for the port namespace existed in three locations: the forms for requesting port number registrations on the IANA web site [SYSFORM][USRFORM], an introductory text section in the file listing the port number registrations themselves [REGISTRY], and two brief sections of [RFC2780]. This document aggregates this scattered information into a single reference and at the same time clarifies the guidelines for the management of the port number space. It gives more detailed guidance to prospective requesters of ports than the existing documentation, and it streamlines the IANA procedures for the management of the port number space, so that management requests can complete in a timely manner. A key factor of this streamlining is to establish identical registration procedures for transport protocol ports, independent of a specific transport protocol. This document brings the IANA procedures for TCP and UDP in line with those already in effect for SCTP and DCCP, resulting in a single process that requesters and IANA Cotton, et al. Expires May 3, 2009 [Page 3] Internet-Draft IANA Port Number Space Procedures November 2008 follow for all port number requests for all transport protocols, including those not yet defined. A second purpose of this document is to describe the principles that guide the IETF and IANA in their role as the long-term joint stewards of the port number space. TCP and UDP have been a remarkable success over the last decades. Thousands of applications and application- level protocols have registered ports for their use, and there is every reason to believe that this trend will continue into the future. It is hence extremely important that management of the port number space follow principles that ensure its long-term usefulness as a shared resource. Section 4 discusses these principles in detail. Guidelines for users seeking port numbers, as well as a detailed history of the port number registry and alternate means for coordinating host agreement on service-to-port-number mappings, is provided in a companion document [I-D.touch-tsvwg-port-guidelines]. In addition to detailing the IANA procedures for the initial assignment of port numbers, this document also specifies post- assignment procedures that until now have been handled in an ad hoc manner. These include procedures to de-register a port number that is no longer in use, to re-use a port number allocated for one application that is no longer in use for another application, and procedure by which IANA can unilaterally revoke a prior port number registration. Section 5 discusses the specifics of these procedures. This document also addresses two technical issues related to the ports registry that are tangential to long-term stewardship. First, it clarifies that a method for the early allocation of port numbers is available for IETF working groups, in line with [RFC4020]. Second, it discusses how the use of symbolic names for assigned ports (the "keyword" field in [REGISTRY]) for Service Resource Records (SRV RRs) in the Domain Name System (DNS) [RFC2782] relates to the use of SRV RRs for applications without an assigned port. This document updates [RFC2780] by obsoleting Sections 8 and 9.1 of RFC. Note that [RFC5237] updates a different subset of the IANA allocation guidelines originally given in [RFC2780] (specifically, the policies on the namespace of the IP protocol number and IPv6 next header). 2. Conventions used in this document The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC-2119 [RFC2119]. Cotton, et al. Expires May 3, 2009 [Page 4] Internet-Draft IANA Port Number Space Procedures November 2008 3. Port Number Types TCP, UDP (and UDP-Lite), SCTP and DCCP use 16-bit namespaces for their port number registries. The port registries for all these transport protocols are subdivided into three ranges of numbers, and Section 6 describes the IANA procedures for each range in detail: o the Well Known Ports, i.e., the System Ports, from 0-1023 (assigned by IANA) o the Registered Ports, i.e., the User Ports, from 1024-49151 (assigned by IANA) o the Dynamic Ports, i.e., the Private Ports, from 49152-65535 (never assigned) Of the assignable port ranges (Well Known and Registered, i.e., port numbers 0-49151), individual port numbers are in one of three states at any given time: 1. Assigned: Assigned port numbers are currently allocated to the service indicated in the registry. 2. Unassigned: Unassigned port numbers are currently available for assignment upon request, as per the procedures outlined in this document. 3. Reserved: Reserved port numbers are not available for regular assignment; they are "assigned to IANA" for special purposes. Reserved port numbers include values at the edges of each range, e.g., 0, 1023, 1024, etc., which may be used to extend these ranges or the overall port number space in the future. When this document was written, approximately 76% of the TCP and UDP Well Known Ports were assigned, as were a significant fraction of the Registered Ports. (As noted, Dynamic Ports are never assigned.) 3.1. Assigned Port Numbers for Experimentation Of the Well-Known Ports, two TCP and UDP port numbers (1021 and 1022) have been assigned for experimentation with new applications and application-layer protocols that require a port number in the assigned ports ranges [RFC4727]. [sctp-dccp-exp] The experimental ports 1021 and 1022 SHOULD be used for local experiments only in controlled environments, and they SHOULD NOT be used on the global Internet. Many new applications and application- Cotton, et al. Expires May 3, 2009 [Page 5] Internet-Draft IANA Port Number Space Procedures November 2008 layer protocols can be experimented with without requiring a port in the Well-Known or Registered Ports range, and port numbers in the Dynamic Ports range can be also used. Unfortunately, it can be difficult to limit access to these ports. Users SHOULD take measures to ensure that experimental ports are connecting to the intended process. For example, users of these experimental ports might include a 64-bit nonce, once on each segment of a message-oriented channel (e.g., UDP), or once at the beginning of a byte-stream (e.g., TCP), which is used to confirm that the port is being used as intended. Such confirmation of intended use is especially important when these ports are associated with privileged (e.g., system or administrator) processes. 4. Principles for Port Number Space Management Management procedures for the port number space include allocation of port numbers upon request, as well as coordination of information about existing allocations. The latter includes maintaining contact and description information about assigned ports, revoking abandoned ports, and redefining port allocations when needed. Of these procedures, port number allocation is most critical, because of the limited number of remaining port numbers. Before the publication of this document, the principles of port number space allocation followed some simple, undocumented guidelines: o TCP and UDP ports were simultaneously allocated when either was requested o Port numbers were the primary allocation; service names were informative only, and did not need to be unique o Port numbers were conserved informally, and sometimes inconsistently (e.g., some services were allocated ranges of many port numbers even where not strictly necessary) o SCTP and DCCP port number and service name spaces were managed separately from the TCP/UDP spaces This document attempts to update these guidelines to more conservatively manage the limited remaining TCP and UDP port number spaces, recognizes the potential use of service names in the absence of corresponding port number allocations, such as in SCTP and DCCP. Cotton, et al. Expires May 3, 2009 [Page 6] Internet-Draft IANA Port Number Space Procedures November 2008 The basic principle of port number registry management is to conserve the space where possible. Extensions to support larger port number spaces would require changing many core protocols of the current Internet in a way that would not be backward compatible and interfere with both current and legacy applications. Port numbers are intended to indicate a service and enable process demultiplexing at an endpoint; uses beyond those basic requirements should be avoided [I-D.touch-tsvwg-port-guidelines]. This document also focuses on service names as a unique identifier, to increase the space available (from 4 bytes to 14), and to enable their use in the absence of corresponding port number assignments. 4.1. Basic Principles of Port Conservation This section summarizes the basic principles by which IANA attempts to conserve the port number space. This description is intended to inform applicants requesting port numbers. IANA decisions are not required to be bound to these principles, however; other factors may come into play, and exceptions may occur where deemed in the best interest of the Internet. Conservation of the port number space recognizes that because this space is a limited resource, applications are expected to participate in the demultiplexing process where feasible. The port numbers are expected to encode as little information as possible that will enable an application to perform further multiplexing by itself. In particular, there should be: o only one port per service o one port for all versions of a service o the same port for different types of devices using the same service A given service is expected to further demultiplex messages where possible. For example, applications and protocols are expected to include in-band version information, so that future versions of the application or protocol can share the same allocated port. Applications and protocols are also expected to be able to efficiently use a single allocated port, either by demultiplexing multiple streams within one port, or using the allocated port to coordinate using dynamic ports for subsequent exchanges (e.g., in the spirit of FTP [RFC0959]). Cotton, et al. Expires May 3, 2009 [Page 7] Internet-Draft IANA Port Number Space Procedures November 2008 These principles of port conservation are explained in [I-D.touch- tsvwg-port-guidelines]. That document explains in further detail how ports are used in various ways, notably: o Endpoint process identifier o Application protocol identifier o Firewall filtering The process and protocol identifier use suggests that anything a single process can demultiplex, or that can be encoded into a single protocol, should be. The firewall filtering use suggests that some uses that could be de-multiplexed or encoded must be separated to allow for firewall management. Note that this latter use is much less sound, because port numbers have meaning only for the two endpoints of a connection (again, as discussed in detail in [I- D.touch-tsvwg-port-guidelines]). 4.2. Principles Specific to Individual Port Number Ranges It is important to note that different IANA procedures apply to different ranges of the port number registry. Section 6 discusses the details of these procedures; this section outlines the rationale for these differences: o Ports in the Dynamic Ports range (49152-65535) have been specifically set aside for local and dynamic use and cannot be registered through IANA. Applications may simply use them for communication without any sort of registration. On the other hand, applications MUST NOT assume that a specific port number in the Dynamic Ports range will always be available for communication at all times, and a port number in that range hence MUST NOT be used as a service identifier. o Ports in the Registered Ports range (1024-49151) are available for registration through IANA, and MAY be used as service identifiers upon successful registration. Because registering a port number for a specific application consumes a fraction of the shared resource that is the port number registry, IANA will require the requester to document the intended use of the port number, and have a technical expert review this documentation to determine whether to grant the registration request. This documentation MUST explain why a port number in the Dynamic Ports range is unsuitable for the given application. Cotton, et al. Expires May 3, 2009 [Page 8] Internet-Draft IANA Port Number Space Procedures November 2008 o Ports in the Well Known Ports range (0-1023) are also available for registration through IANA. Because the Well Known Ports range is both the smallest and the most densely allocated one, the bar for new allocations is higher than that for the Registered Ports range (1024-49551). A request for a Well Known port number MUST document why a port number in the Registered Ports or Dynamic Ports ranges is unsuitable. 4.3. New Principles Several new practices stem from the conservation principle that guides management of the port numbers registry, and will take effect with the approval of this document: o IANA will allocate port numbers only to the transport protocols requested o IANA will recover unused port numbers, via the new procedures of de-registration, revocation, and transfer IANA will begin assigning protocol numbers only for those transport protocols explicitly included in a registration request. This ends the long-standing practice of automatically assigning a port number to an application for both TCP and a UDP, even if the request is only for one of these transport protocols. The new allocation procedure conserves resources by only allocating a port number to an application for those transport protocols (TCP, UDP, SCTP and/or DCCP) it actually uses. The port number will be marked as reserved - instead of assigned - in the port number registries of the other transport protocols. When applications start supporting the use of some of those additional transport protocols, they must request IANA to convert the reservation into an assignment. An application MUST NOT assume that it can use a port number assigned to it for use with one transport protocol with another transport protocol without another registration with IANA. The reason for this procedure is to allow allocation of reserved port numbers on the day the range has no more unassigend values. [port-reserv] Conservation for the port numbers registry is improved by procedures that allow previously allocated port numbers to become unassigned, either through de-registration or through revocation, and by a procedure that lets application designers transfer an allocated but unused port number to a new application. Section 5 describes these procedures, which so far were undocumented. Cotton, et al. Expires May 3, 2009 [Page 9] Internet-Draft IANA Port Number Space Procedures November 2008 5. IANA Procedures for Managing the Port Number Space IANA supports various procedures to manage the port number space that enable ports to be registered, de-registered, reused, and revoked. This section explains these procedures, as well as other related issues. 5.1. Port Number Registration Registration refers to the allocation of port numbers to applicants. All such registrations are made from port numbers that are Unassigned or Reserved at the time of the allocation. Unassigned numbers are allocated as needed, and without further explanation. Reserved numbers are assigned only after review by IANA and the IETF, and are accompanied by a statement explaining the reason a reserved number is appropriate for this action. When a registration for one or more (but not all) transport protocols is approved, the port number for the non-requested transport protocol(s) will remain unassigned but is marked as reserved. However, IANA SHOULD NOT assign that port number to any other application or service until no port numbers remain unassigned in the request range. The current registration owner of a port number MAY register the same port number for other transport protocols when needed. A port number registration consists of the following tuple: o Registration Technical Contact: Name and email address of the technical contact person for the registration. This is REQUIRED. Additional address information MAY be provided. For registrations done through IETF-published RFCs, one or more technical contact persons SHALL be provided. o Registration Owner: Name and email address of the owner of the registration. This is REQUIRED. For individuals, this is the same as the registration technical contact; for organizations, this is a point of contact at that organization. For registrations done through IETF-published RFCs, the registration ownership will belong to the IETF and not the technical contact persons. o Transport Protocol: The transport protocol(s) for which the port allocation is requested, currently limited to one or more of TCP, UDP, SCTP, and DCCP. Cotton, et al. Expires May 3, 2009 [Page 10] Internet-Draft IANA Port Number Space Procedures November 2008 o Port Number: The currently unassigned port number(s) the requester suggests for allocation. If specified and when possible, IANA is encouraged to allocate the suggested number. If not specified, IANA will choose a suitable number from the Registered Ports range. Note that the applicant MUST NOT use the suggested ports prior to the completion of registration. o Broadcast, Multicast or Anycast: Indicates whether the protocol supports either broadcast, multicast, or anycast network layer addresses. o Port Name: The long name (description) of the port. It should avoid all but the most well known acronyms. o Service Name: This short name for the port number, used in various service selection and discovery mechanisms, currently including TCPMUX [RFC1078] and DNS SRV resource records [RFC2782]. This name is limited to 14 bytes, case-insensitive US-ASCII letters, digits, and dashes. It MUST NOT conflict with already allocated names in the service name registry [serv-nam-reg]. o Reference: A reference document describing the protocol or application using this port. For registration requests for Registered Ports, this documentation MUST explain why a port number in the Dynamic Ports range is unsuitable for the given application. For registration requests for Well Known Ports, this documentation MUST explain why a port number in the Registered Ports or Dynamic Ports ranges is unsuitable. The following rules apply to the port number registry database maintained by IANA: [database-rules] o Service Names MUST be unique. o Service Name MUST exist for all transport protocols. o Port Number MUST exist for TCP and UDP; it MAY exist for SCTP and DCCP. o Transport Protocol MUST exist for all entries. o Service Code MUST NOT occur for TCP, UDP or SCTP, and MUST occur for DCCP. o Port Name MUST exist for all entries. Cotton, et al. Expires May 3, 2009 [Page 11] Internet-Draft IANA Port Number Space Procedures November 2008 o Currently valid Registration Contact SHOULD exist for all entries; it MUST exist for all new entries. o Reference SHOULD exist for all entries. 5.2. Port Number De-Registration The original requesters of a granted port number assignment can return the port number to IANA at any time if they no longer have a need for it. The port number will be de-registered and will be marked as reserved [res-vs-unass]. IANA should not re-assign port numbers that have been de-registered until all other available port numbers in the specific range have been assigned. Before proceeding with a de-registration, IANA needs to reasonably establish that the port number is no longer in use. 5.3. Port Number Re-Use If the original requesters of a granted port number assignment no longer have a need for the registered number, but would like to re- use it for a different application, they can submit a request to IANA to do so. Logically, port number re-use is to be thought of as a de- registration followed by an immediate re-registration of the same port number for a new application. Consequently, the information that needs to be provided about the proposed new use of the port number is identical to what would need to be provided for a new port number allocation for the specific ports range. IANA needs to carefully review such requests before approving them. In some instances, the Expert Reviewer will determine that the application that the port number was assigned to has found usage beyond the original requester, or that there is a concern that it may have such users. This determination MUST be made quickly. A community call concerning revocation of a port number (see below) MAY be considered, if a broader use of the port number is suspected. 5.4. Port Number Revocation Sometimes, it will be clear that a specific port number is no longer in use and that IANA can de-register it and mark it as reserved [res- vs-unass2]. At other times, it may be unclear whether a given assigned port number is still in use somewhere in the Internet. In those cases, despite the requester's wish to de-register, IANA must consider the consequences that de-registering the port number. Cotton, et al. Expires May 3, 2009 [Page 12] Internet-Draft IANA Port Number Space Procedures November 2008 With the help of their IESG-appointed Expert Reviewer, IANA SHALL formulate a request to the IESG to issue a four-week community call concerning the pending port number revocation. The IESG and IANA, with the Expert Reviewer's support, SHALL determine promptly after the end of the community call whether revocation should proceed and then communicate their decision to the community. This procedure typically involves similar steps to de-registration except that it is initiated by IANA. 5.5. Port Number Transfer The value of port numbers is defined by their careful management as a shared Internet resource, whereas enabling transfer allows the potential for associated monetary exchanges to motivate this management. As a result, current IANA procedures do not permit port number assignments to be transferred between parties, even when they are mutually consenting. The appropriate alternate procedure is for the new party to request its own port number registration and for the previous party to release its registration via the de-registration procedure outlined above. 5.6. Maintenance Issues The previous procedures help IANA manage defining properties of the port name space. There are additional procedures which are administrative, and help IANA maintain non-defining information in a registration. This includes changes to the Port Name (i.e., description), and changes to contact information. These changes are coordinated by IANA in an informal manner, and may be initiated by either the registrant or by IANA, e.g., the latter when requesting an update to current contact information. 6. Port Number Space Requests This section describes the process for requests associated with IANA's management of the the port number space. Such requests include initial registration, de-registration, re-use, changes to the service name, as well as updates to the contact information or port name (description). Revocation is initiated by IANA. 6.1. Request Procedure All registration requests for a TCP, SCTP, DCCP and/or UDP ports must contain the following pieces of information: Cotton, et al. Expires May 3, 2009 [Page 13] Internet-Draft IANA Port Number Space Procedures November 2008 o Port number tuple: A port number tuple, as described in Section 5.1. The port number would typically be omitted; when provided, it indicates a preference for requesting a currently unassigned value. o Port Range: Indicates the port range desired (i.e., Well Known Ports or Registered Ports). o Requested Action: One of REGISTER, DEREGISTER, REUSE, SVC_NAME_CHANGE, or UPDATE_INFO (port name, registration contact). The Well Known Ports are assigned by IANA and cover the range 0-1023. On many systems, they can only be used by system (or root) processes or by programs executed by privileged users. Registration requests for a Well Known port number MUST follow the "IETF Review" policy of [RFC5226]. Registrations for a port number in this range MUST document why a port number in the Registered Ports range will not fulfill the application needs. The Registered Ports are assigned by IANA and on most systems can be used by ordinary user processes or programs executed by ordinary users. The Registered Ports are in the range 1024-49151. Registration requests for a Registered Port number MUST follow the "Expert Review" policy of [RFC5226]. 7. Security Considerations The IANA guidelines described in this document do not change the security properties of either TCP, SCTP, DCCP or UDP. Assignment of a port number does not in any way imply an endorsement of an application or product, and the fact that network traffic is flowing to or from a registered port number does not mean that it is "good" traffic, or even that it is used by the assigned service. Firewall and system administrators should choose how to configure their systems based on their knowledge of the traffic in question, not whether there is a port number registered or not. 8. IANA Considerations This document obsoletes Sections 8 and 9.1 of [RFC2780]. Upon approval of this document, IANA is requested to adopt the procedures described herein. IANA should take immediate actions to resolve inconsistencies raised by requirements of this document. Cotton, et al. Expires May 3, 2009 [Page 14] Internet-Draft IANA Port Number Space Procedures November 2008 9. Acknowledgments The text in Appendix A is based on a suggestion by Tom Phelan. Lars Eggert is partly funded by [TRILOGY], a research project supported by the European Commission under its Seventh Framework Program. This document was prepared using 2-Word-v2.0.template.dot. Cotton, et al. Expires May 3, 2009 [Page 15] Internet-Draft IANA Port Number Space Procedures November 2008 10. References 10.1. Normative References [RFC0768] Postel, J., "User Datagram Protocol", STD 6, RFC 768, August 1980. [RFC0793] Postel, J., "Transmission Control Protocol", STD 7, RFC 793, September 1981. [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC2780] Bradner, S. and V. Paxson, "IANA Allocation Guidelines For Values In the Internet Protocol and Related Headers", BCP 37, RFC 2780, March 2000. [RFC4020] Kompella, K. and A. Zinin, "Early IANA Allocation of Standards Track Code Points", BCP 100, RFC 4020, February 2005. [RFC4340] Kohler, E., Handley, M., and S. Floyd, "Datagram Congestion Control Protocol (DCCP)", RFC 4340, March 2006. [RFC4727] Fenner, B., "Experimental Values In IPv4, IPv6, ICMPv4, ICMPv6, UDP, and TCP Headers", RFC 4727, November 2006. [RFC5226] Narten, T. and H. Alvestrand, "Guidelines for Writing an IANA Considerations Section in RFCs", BCP 26, RFC 5226, May 2008. 10.2. Informative References [I-D.touch-tsvwg-port-guidelines] Touch, J., "Guidelines for Transport Port Use", Work in Progress, Nov. 2008. [REGISTRY] Internet Assigned Numbers Authority (IANA), "Port Numbers", http://www.iana.org/assignments/port-numbers. [RFC0959] Postel, J. and J. Reynolds, "File Transfer Protocol", STD 9, RFC 959, October 1985. [RFC1078] Lottor, M., "TCP port service Multiplexer (TCPMUX)", RFC 1078, November 1988. Cotton, et al. Expires May 3, 2009 [Page 16] Internet-Draft IANA Port Number Space Procedures November 2008 [RFC2782] Gulbrandsen, A., Vixie, P., and L. Esibov, "A DNS RR for specifying the location of services (DNS SRV)", RFC 2782, February 2000. [RFC4342] Floyd, S., Kohler, E., and J. Padhye, "Profile for Datagram Congestion Control Protocol (DCCP) Congestion Control ID 3: TCP-Friendly Rate Control (TFRC)", RFC 4342, March 2006. [RFC4960] Stewart, R., "Stream Control Transmission Protocol", RFC 4960, September 2007. [RFC5237] Arkko, J. and S. Bradner, "IANA Allocation Guidelines for the Protocol Field", BCP 37, RFC 5237, February 2008. [SYSFORM] Internet Assigned Numbers Authority (IANA), "Application for System (Well Known) Port Number", http://www.iana.org/cgi-bin/sys-port-number.pl. [TRILOGY] "Trilogy Project",http://www.trilogy-project.org/. [USRFORM] Internet Assigned Numbers Authority (IANA), "Application for User (Registered) Port Number", http://www.iana.org/cgi-bin/usr-port-number.pl. Editorial Comments [database-rules] Lars: Some of these rules below allow entries that aren't in full alignment with the procedures in this document. I assume that is, because the rules attempt to describe the state of the IANA database including all existing entries? If so, we should make that clearer. [port-reserv] Magnus: The usage of for the above reason reserved port numbers should probably not have the same rules as the other reserved ports. Needs discussion if we should separate this properly. I think the IETF consultation part will make it difficult the day one registry runs out of unassigned ones. [res-vs-unass] Lars: This used to say "unassigned" instead of "reserved". I suggest "reserved", so that IANA has an indication in their list that they need to be careful when re-assigning a previously de-registered port. [res-vs-unass2] Lars: See [res-vs-unass]. Cotton, et al. Expires May 3, 2009 [Page 17] Internet-Draft IANA Port Number Space Procedures November 2008 [sctp-dccp-exp] Lars: This document should register ports 1021 and 1022 for DCCP and SCTP. Joe: and potentially for all new protocols, as suggested by Alfred? [serv-nam-reg] Lars: Add citation to the service name registry draft, when it exists Cotton, et al. Expires May 3, 2009 [Page 18] Internet-Draft IANA Port Number Space Procedures November 2008 APPENDIX A: Updates to DCCP Registries This document updates the IANA allocation procedures for the DCCP Port Number and DCCP Service Codes Registries as defined in [RFC4340]. A.1. DCCP Service Code Registry Service Codes are allocated first-come-first-served according to Section 19.8 of [RFC4340]. This document updates Section 19.8 of [RFC4340] by extending the guidelines given there in the following ways: o IANA MAY assign new Service Codes without seeking Expert Review using their discretion, but SHOULD seek expert review when a request seeks an appreciable number of Service Codes (e.g., more than five). o IANA should feel free to contact the DCCP Expert Reviewer with questions on any registry, regardless of the registry policy, for clarification or if there is a problem with a request [RFC4340]. A.2. DCCP Port Numbers Registry The DCCP ports registry is defined by [RFC4340] in Section 19.9. Allocations in this registry require prior allocation of a Service Code. Not all Service Codes require IANA-registered ports. This document updates Section 19.9 of [RFC4340] by extending the guidelines given there in the following way: o IANA should normally assign a value in the range 1024-49151 to a DCCP server port. IANA allocation requests to allocate port numbers in the Well Known Ports range (0 through 1023), require IETF action prior to allocation by IANA [RFC4340]. Such action typically requires confirmation that the protocol indicated is in the standards track of the IETF. Section 19.9 of [RFC4340] requires each DCCP server port assignment to be associated with at least one Service Code value. This document updates [RFC4340] in the following way: o IANA MUST NOT allocate a single Service Code value to more than one DCCP server port. o The set of Service Code values associated with a DCCP server port should be recorded in the ports registry. Cotton, et al. Expires May 3, 2009 [Page 19] Internet-Draft IANA Port Number Space Procedures November 2008 o A request for additional Service Codes to be associated with an already allocated Port Number requires Expert Review. These requests will normally be accepted when they originate from the contact associated with the port registration. In other cases, these applications will be expected to use an unallocated port, when this is available. RFC4340] notes that a short port name MUST be associated with each DCCP server port that has been registered. This document requires that this name MUST be unique. Cotton, et al. Expires May 3, 2009 [Page 20] Internet-Draft IANA Port Number Space Procedures November 2008 Authors' Addresses Michelle Cotton Internet Corporation for Assigned Names and Numbers 4676 Admiralty Way, Suite 330 Marina del Rey, CA 90292 USA Phone: +1 310 823 9358 Email: michelle.cotton@icann.org URI: http://www.iana.org/ Lars Eggert Nokia Research Center P.O. Box 407 Nokia Group 00045 Finland Phone: +358 50 48 24461 Email: lars.eggert@nokia.com URI: http://research.nokia.com/people/lars_eggert/ Allison Mankin Johns Hopkins Univ. USA Phone: +1 301 728 7199 Email: mankin@psg.com URI: http://www.psg.com/~mankin/ Magnus Westerlund Ericsson Torshamsgatan 23 Stockholm 164 80 Sweden Phone: +46 8 719 0000 Email: magnus.westerlund@ericsson.com Joe Touch USC/ISI 4676 Admiralty Way Marina del Rey, CA 90292 Cotton, et al. Expires May 3, 2009 [Page 21] Internet-Draft IANA Port Number Space Procedures November 2008 USA Phone: +1 310 448 9151 Email: touch@isi.edu URI: http://www.isi.edu/touch Full Copyright Statement Copyright (C) The IETF Trust (2008). This document is subject to the rights, licenses and restrictions contained in BCP 78, and except as set forth therein, the authors retain all their rights. This document and the information contained herein are provided on an "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY, THE IETF TRUST AND THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Intellectual Property Statement The IETF takes no position regarding the validity or scope of any Intellectual Property Rights 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; nor does it represent that it has made any independent effort to identify any such rights. Information on the procedures with respect to rights in RFC documents can be found in BCP 78 and BCP 79. Copies of IPR disclosures made to the IETF Secretariat 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 on-line IPR repository at http://www.ietf.org/ipr. 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 implement this standard. Please address the information to the IETF at ietf-ipr@ietf.org. Cotton, et al. Expires May 3, 2009 [Page 22]