Network Working Group
Internet Engineering Task Force (IETF)                          O. Troan
Internet-Draft
Request for Comments: 8425                                 Cisco Systems
Updates: 4861 (if approved)                               April 30,                                                  July 2018
Intended status:
Category: Standards Track
Expires: November 1, 2018
ISSN: 2070-1721

            IANA Considerations for IPv6 Neighbor Discovery
                    Prefix Information Option Flags
                      draft-ietf-6man-ndpioiana-04

Abstract

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

Status of This Memo

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   This Internet-Draft will expire on November 1, 2018.
   https://www.rfc-editor.org/info/rfc8425.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Current Prefix Information Option Flags . . . . . . . . . . .   2
   3.  Updates to RFC 4861 . . . . . . . . . . . . . . . . . . . . .   2
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   3
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   3
   6.  Normative References  . . . . . . . . . . . . . . . . . . . .   3
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   4

1.  Introduction

   The Prefix Information Option (PIO) in the IPv6 Neighbor Discovery
   Router Advertisement message defines an 8-bit flag field; this field with
   has two flags defined and the remaining 6 bits are reserved
   (Reserved1).  RFC 6275 has
   defined defines a new flag from this field without
   creating a an 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 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 1: PIO Flags

      L - On-link Flag [RFC4861]

      A - Autonomous Address Configuration Flag [RFC4861]

      R - Router Address Agent Flag [RFC6275]

      Reserved1 - Reserved

3.  Updates to RFC4861 RFC 4861

   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 document (see
   Section 4).

   Specifically, the current list of flags in the Prefix Information
   Option can be found in IANA-TBD. the "IPv6 Neighbor Discovery Prefix
   Information Option Flags" registry.

4.  IANA Considerations

   The

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

       +---------------+---------------------------------+-----------+ are as follows:

       +----------------+---------------------------------+-----------+
       | RA PIO 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 2: IPv6 Neighbor Discovery Prefix Information Option Flags

   The assignment of new flags in the PIO option header require requires
   Standards Action [RFC8126].

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

   [RFC8126]  Cotton, M., Leiba, B., and T. Narten, "Guidelines for
              Writing an IANA Considerations Section in RFCs", BCP 26,
              RFC 8126, DOI 10.17487/RFC8126, June 2017,
              <https://www.rfc-editor.org/info/rfc8126>.

Author's Address

   Ole Troan
   Cisco Systems
   Philip Pedersens vei 1
   Lysaker  1366
   Norway

   Email: ot@cisco.com