Network Working Group                                           O. Troean Troan
Internet-Draft                                             Cisco Systems
Updates: 4861 (if approved)                             January 10,                               April 29, 2018
Intended status: Standards Track
Expires: July 14, October 31, 2018

   IANA Considerations for IPv6 ND PIO Neighbor Discovery Prefix Information
                              Option Flags IANA considerations
                      draft-ietf-6man-ndpioiana-02
                      draft-ietf-6man-ndpioiana-03

Abstract

   The Prefix Information Option in the IPv6 Neighbor Discovery Router
   Advertisement message defines an 8-bit flag field with two flags
   defined and the remaining 6 bits reserved (Reserved1).  RFC 6275 has
   defined a new flag from this field without creating a IANA registry
   or updating RFC 4861.  The purpose of this document is to request that IANA to
   create a
   new IANA registry for the PIO flags to avoid potential conflict
   in the use of these flags.  This document updates RFC 4861.

Status of This Memo

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1.  Introduction

   The Prefix Information Option (PIO) in the IPv6 Neighbor Discovery
   Router Advertisement defines an 8-bit flag field with two flags
   defined and the remaining 6 bits reserved (Reserved1).  RFC 6275 has
   defined a new flag from this field without creating a IANA registry
   or updating RFC 4861.  The purpose of this document is to request that IANA to create a
   new registry for the PIO flags to avoid potential conflict
   in the use of these flags.

2.  Current Prefix Information Option flags

   Currently, the NDP Neighbor Discovery Protocol Prefix Information Option
   [RFC4861] contains the following one-bit flags defined in published
   RFCs:

                               0 1 2 3 4 5 6 7
                              +-+-+-+-+-+-+-+-+
                              |L|A|R|Reserved1|
                              +-+-+-+-+-+-+-+-+

                                 Figure 1

      L - On-link Flag [RFC4861]

      A - Autonomous Address Configuration Flag [RFC4861]

      R - Router Address Agent Flag [RFC6275]

      Reserved1 - Reserved

3.  Updates to RFC4861

   This document updates Section 4.6.2 "Prefix Information" of [RFC4861]
   to point to the new IANA registry that is created in this document.

   Specifically: The current list of flags in the Prefix Information
   Option can be found in [IANA-TBD]. IANA-TBD.

4.  IANA Considerations

   The IANA is requested to create a new registry for IPv6 ND Neighbor
   Discovery Prefix Information Option flags.  This should include the
   current flags in the PIO option.  The format for the registry is:

       +---------------+---------------------------------+-----------+
       | RA Option Bit | Description                     | Reference |
       +---------------+---------------------------------+-----------+
       | 0             | L - On-link Flag                | [RFC4861] |
       | 1             | A - Autonomous Address          | [RFC4861] |
       |               |     Configuration Flag          |           |
       | 2             | R - Router Address Flag         | [RFC6275] |
       | 3-7           | Reserved                        |           |
       +---------------+---------------------------------+-----------+

                                 Figure 2

   The assignment of new flags in the PIO option header require
   standards action.
   Standards Action.

   The registry for these flags should be added to:
   http://www.iana.org/assignments/icmpv6-parameters

5.  Security Considerations

   This document has no security considerations.

6.  References

6.1.  Normative References

   [RFC4861]  Narten, T., Nordmark, E., Simpson, W., and H. Soliman,
              "Neighbor Discovery for IP version 6 (IPv6)", RFC 4861,
              DOI 10.17487/RFC4861, September 2007,
              <https://www.rfc-editor.org/info/rfc4861>.

6.2.  Informative References

   [RFC6275]  Perkins, C., Ed., Johnson, D., and J. Arkko, "Mobility
              Support in IPv6", RFC 6275, DOI 10.17487/RFC6275, July
              2011, <https://www.rfc-editor.org/info/rfc6275>.

Author's Address

   Ole Troean Troan
   Cisco Systems
   Philip Pedersens vei 1
   Lysaker  1366
   Norway

   Email: ot@cisco.com