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

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

   IANA Considerations for IPv6 Neighbor Discovery Prefix Information
                              Option Flags
                      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 a
   new IANA registry for the PIO flags.  This document updates RFC 4861.

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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 to create a
   new registry for the PIO flags.

2.  Current Prefix Information Option flags

   Currently, the 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.

4.  IANA Considerations

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

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       +---------------+---------------------------------+-----------+
       | 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.

   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.  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>.

   [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 Troan
   Cisco Systems
   Philip Pedersens vei 1
   Lysaker  1366
   Norway

   Email: ot@cisco.com

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