Stub Router Flag in ICMPv6 Router Advertisement Messages
draft-hui-6man-stub-router-ra-flag-00

Internet Engineering Task Force                                   J. Hui
Internet-Draft                                                Google LLC
Intended status: Standards Track                           19 March 2024
Expires: 20 September 2024

        Stub Router Flag in ICMPv6 Router Advertisement Messages
                 draft-hui-6man-stub-router-ra-flag-00

Abstract

   This document defines a new flag, the Stub Router flag, in the Router
   Advertisement message that can be used to distinguish configuration
   information sent by stub routers from information sent by
   infrastructure routers.  This flag is used only by stub routers and
   is ignored by all other devices.

Status of This Memo

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   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on 20 September 2024.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Stub Router Flag  . . . . . . . . . . . . . . . . . . . . . .   2
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   2
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   3
   6.  Normative References  . . . . . . . . . . . . . . . . . . . .   3
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   3

1.  Introduction

   A stub router is an autonomously-configuring router that provides IP
   connectivity between one or more stub networks and one or more
   infrastructure networks.  A common stub router example is a device
   that attaches a 6LoWPAN-based network to a home network,
   automatically providing IPv6 forwarding between the two networks
   without explicit operator configuration.  Stub routers are described
   in [I-D.ietf-snac-simple].  This document defines a new RA flag, the
   "stub router" flag, which stub routers use to identify RAs sent by
   other stub routers.

2.  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in BCP
   14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

3.  Stub Router Flag

   The "Stub Router" flag is router advertisement flag bit TBD.

   The stub router flag is to be used by stub routers.  The use of this
   flag is documented in [I-D.ietf-snac-simple].  Devices that do not
   implement [I-D.ietf-snac-simple] MUST NOT set the stub router flag,
   and MUST silently ignore the stub router flag.  This means that the
   presence or absence of the flag should not change the behavior of
   such devices in any way (other than that it is of course permissible
   to log and cache the value of the flag as part of normal router
   advertisement processing, where applicable.

4.  IANA Considerations

   IANA is requested to allocate a flag from the "IPv6 ND Router
   Advertisement flags" registry of [RFC5175], as specified below:

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         +---------------+----------------------+---------------+
         | RA Option Bit | Description          | Reference     |
         +---------------+----------------------+---------------+
         | TBD           | S - Stub Router Flag | This Document |
         +---------------+----------------------+---------------+

                                 Table 1

5.  Security Considerations

   This protocol shares the security issues of NDP that are documented
   in the "Security Considerations" section of [RFC4861].

6.  Normative References

   [I-D.ietf-snac-simple]
              Lemon, T. and J. Hui, "Automatically Connecting Stub
              Networks to Unmanaged Infrastructure", Work in Progress,
              Internet-Draft, draft-ietf-snac-simple-04, 4 March 2024,
              <https://datatracker.ietf.org/doc/html/draft-ietf-snac-
              simple-04>.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <https://www.rfc-editor.org/info/rfc2119>.

   [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>.

   [RFC5175]  Haberman, B., Ed. and R. Hinden, "IPv6 Router
              Advertisement Flags Option", RFC 5175,
              DOI 10.17487/RFC5175, March 2008,
              <https://www.rfc-editor.org/info/rfc5175>.

   [RFC8174]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
              2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
              May 2017, <https://www.rfc-editor.org/info/rfc8174>.

Author's Address

   Jonathan Hui
   Google LLC
   1600 Amphitheatre Parkway
   Mountain View, California 940432
   United States of America

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   Email: jonhui@google.com

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