Deprecating the Anycast Prefix for 6to4 Relay Routers
RFC 7526

Document Type RFC - Best Current Practice (May 2015; No errata)
Obsoletes RFC 6732, RFC 3068
Also known as BCP 196
Last updated 2015-05-20
Replaces draft-troan-v6ops-6to4-to-historic
Stream IETF
Formats plain text pdf html bibtex
Stream WG state Submitted to IESG for Publication
Document shepherd Fred Baker
Shepherd write-up Show (last changed 2015-01-30)
IESG IESG state RFC 7526 (Best Current Practice)
Consensus Boilerplate Yes
Telechat date
Responsible AD Joel Jaeggli
IESG note The document shepherd is Fred Baker (fred@cisco.com).
Send notices to (None)
IANA IANA review state IANA OK - Actions Needed
IANA action state RFC-Ed-Ack
Internet Engineering Task Force (IETF)                          O. Troan
Request for Comments: 7526                                         Cisco
BCP: 196                                               B. Carpenter, Ed.
Obsoletes: 3068, 6732                                  Univ. of Auckland
Category: Best Current Practice                                 May 2015
ISSN: 2070-1721

         Deprecating the Anycast Prefix for 6to4 Relay Routers

Abstract

   Experience with the 6to4 transition mechanism defined in RFC 3056
   ("Connection of IPv6 Domains via IPv4 Clouds") has shown that the
   mechanism is unsuitable for widespread deployment and use in the
   Internet when used in its anycast mode.  Therefore, this document
   requests that RFC 3068 ("An Anycast Prefix for 6to4 Relay Routers")
   and RFC 6732 ("6to4 Provider Managed Tunnels") be made obsolete and
   moved to Historic status.  It recommends that future products should
   not support 6to4 anycast and that existing deployments should be
   reviewed.  This complements the guidelines in RFC 6343.

Status of This Memo

   This memo documents an Internet Best Current Practice.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   BCPs is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7526.

Troan & Carpenter         Best Current Practice                 [Page 1]
RFC 7526                Deprecating 6to4 Anycast                May 2015

Copyright Notice

   Copyright (c) 2015 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Related Work  . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Conventions . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  6to4 Operational Problems . . . . . . . . . . . . . . . . . .   4
   4.  Deprecation . . . . . . . . . . . . . . . . . . . . . . . . .   5
   5.  Implementation Recommendations  . . . . . . . . . . . . . . .   5
   6.  Operational Recommendations . . . . . . . . . . . . . . . . .   6
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   7
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   8
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

Troan & Carpenter         Best Current Practice                 [Page 2]
RFC 7526                Deprecating 6to4 Anycast                May 2015

1.  Introduction

   The original form of the 6to4 transition mechanism [RFC3056] relies
   on unicast addressing.  However, its extension specified in "An
   Anycast Prefix for 6to4 Relay Routers" [RFC3068] has been shown to
   have severe practical problems when used in the Internet.  This
   document requests that RFCs 3068 and 6732 be moved to Historic
   status, as defined in Section 4.2.4 of [RFC2026].  It complements the
   deployment guidelines in [RFC6343].

   6to4 was designed to help transition the Internet from IPv4 to IPv6.
   It has been a good mechanism for experimenting with IPv6, but because
   of the high failure rates seen with anycast 6to4 [HUSTON], end users
   may end up disabling IPv6 on hosts; this has resulted in some content
   providers being reluctant to make content available over IPv6 in the
   past.

   [RFC6343] analyzes the known operational issues in detail and
   describes a set of suggestions to improve 6to4 reliability, given the
   widespread presence of hosts and customer premises equipment that
Show full document text