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IETF RFC 5237

IANA Allocation Guidelines for the Protocol Field

Last modified on Thursday, February 28th, 2008

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Network Working Group                                           J. Arkko
Request for Comments: 5237                                      Ericsson
BCP: 37                                                       S. Bradner
Updates: 2780                                         Harvard University
Category: Best Current Practice                          February 2008


           IANA Allocation Guidelines for the Protocol Field

 Status of This Memo

   This document specifies an Internet Best Current Practices for the
   Internet Community, and requests discussion and suggestions for
   improvements.  Distribution of this memo is unlimited.

 Abstract

   This document revises the IANA guidelines for allocating new Protocol
   field values in IPv4 header.  It modifies the rules specified in RFC
   2780 by removing the Expert Review option.  The change will also
   affect the allocation of Next Header field values in IPv6.

1.  Introduction

   This document revises the IANA guidelines [RFC 2780] for allocating
   new Protocol field values in IPv4 header [RFC 791].  The change will
   also be applicable for IPv6, as the IANA guidelines for IPv6 Next
   Header values [RFC 2460] allocation refer to the IPv4 guidelines.

   Previously, RFC 2780 allowed such allocations to happen through IESG
   Approval, Standards action, or Expert Review processes
   [RFC 2780][RFC 2434].  The Expert Review process was specified to be
   used only in the case where a non-disclosure agreement was involved:

      IANA allocates values from the IPv4 Protocol name space following
      an Expert Review, IESG Approval or Standards Action process.  The
      Expert Review process should only be used in those special cases
      where non-disclosure information is involved.  In these cases the
      expert(s) should be designated by the IESG.

   The need for the Standards Action rule is obvious as the IETF keeps
   developing new protocols.  It is equally obvious that there is a need
   to allow experimental allocations in this space; see RFC 4727
   [RFC 4727] for an example.  Similarly, there are cases when it makes
   sense to allocate values out of this space for other non-Standards
   Track or non-IETF uses.  However, the size of the field is 256
   values, and 55% of these were in use at the time this document was
   written.  As a result, a sanity check is needed to ensure that



Arkko & Bradner          Best Current Practice               PAGE 1 top


RFC 5237 Protocol Field IANA Rules February 2008 allocations are not made needlessly. RFC 2780 specifies the IESG Approval rule to take care of these sanity checks for the non- Standards Track cases. The judgment call can take into account the existence of a stable protocol specification, constituency that wants to use it, need to avoid duplicated allocations for the same purpose, whether protocol number allocation is the right solution for this problem as opposed to, say, a TCP port, and so on. However, we now believe that the non-disclosure agreement option is not appropriate for allocations in this space. Traditionally, non- disclosure agreements have been used by the IANA when a company was developing a proprietary protocol and did not want to disclose new areas of research or future products. The protocol space is limited enough that we no longer believe that it is reasonable to use the resource for such proprietary protocols. Thus, we believe that allocations should only be made using the IESG Approval or Standards Action processes when there are public specifications that can be reviewed. As a result, this document revises the RFC 2780 rules by removing the option for Expert Review for the IPv4 Protocol and IPv6 Next Header fields. This document takes no position on the allocation of other parameters with non-disclosure agreements, as those parameters may require different policies. 2. IANA Considerations This document replaces the RFC 2780 Section 4.3 rule [RFC 2780] with the following: IANA allocates values from the IPv4 Protocol name space following an IESG Approval or Standards Action process. This document also makes an implicit change to the rule for the IPv6 Next Header field in Section 5.3 of RFC 2780. That rule refers to the rule in Section 4.3 of the same RFC. From now on, this reference should be understood to refer to the rule revised here, i.e., without the Expert Review option. 3. Security Considerations This specification does not change the security properties of the affected protocols. Arkko & Bradner Best Current Practice PAGE 2 top

RFC 5237 Protocol Field IANA Rules February 2008 4. Acknowledgments Issues with the original RFC 2780 rules were uncovered in discussions of the IETF-IANA team. The team also provided background information on the practical difficulties encountered with non-disclosure agreements. The authors would like to thank Thomas Narten, Bill Fenner, and Michelle Cotton in particular. 5. References 5.1. Normative References [RFC 791] Postel, J., "Internet Protocol", STD 5, RFC 791, September 1981. [RFC 2434] Narten, T. and H. Alvestrand, "Guidelines for Writing an IANA Considerations Section in RFCs", BCP 26, RFC 2434, October 1998. [RFC 2460] Deering, S. and R. Hinden, "Internet Protocol, Version 6 (IPv6) Specification", RFC 2460, December 1998. [RFC 2780] Bradner, S. and V. Paxson, "IANA Allocation Guidelines For Values In the Internet Protocol and Related Headers", BCP 37, RFC 2780, March 2000. 5.2. Informative References [RFC 4727] Fenner, B., "Experimental Values In IPv4, IPv6, ICMPv4, ICMPv6, UDP, and TCP Headers", RFC 4727, November 2006. Arkko & Bradner Best Current Practice PAGE 3 top

RFC 5237 Protocol Field IANA Rules February 2008 Appendix A. Changes from RFC 2780 Section 4.3 from RFC 2780 has been changed from: IANA allocates values from the IPv4 Protocol name space following an Expert Review, IESG Approval or Standards Action process. The Expert Review process should only be used in those special cases where non-disclosure information is involved. In these cases the expert(s) should be designated by the IESG. to: IANA allocates values from the IPv4 Protocol name space following an IESG Approval or Standards Action process. In addition, RFC 2780 Section 5.3 reference to IPv4 rules should be understood to refer to the rule revised here, i.e., without the Expert Review option. Authors' Addresses Jari Arkko Ericsson Jorvas 02420 Finland EMail: jari.arkko@piuha.net Scott Bradner Harvard University Cambridge, MA 02138 US Phone: +1 617 495 3864 EMail: sob@harvard.edu Arkko & Bradner Best Current Practice PAGE 4 top

RFC 5237 Protocol Field IANA Rules February 2008 Full Copyright Statement Copyright © 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 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. Arkko & Bradner Best Current Practice PAGE 5 top

IANA Allocation Guidelines for the Protocol Field RFC TOTAL SIZE: 9303 bytes PUBLICATION DATE: Thursday, February 28th, 2008 LEGAL RIGHTS: The IETF Trust (see BCP 78)


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