Deprecating the Anycast Prefix for 6to4 Relay Routers
RFC 7526
Document | Type |
RFC - Best Current Practice
(May 2015; No errata)
Also known as BCP 196
|
|
---|---|---|---|
Authors | Ole Trøan , Brian Carpenter | ||
Last updated | 2015-05-20 | ||
Replaces | draft-troan-v6ops-6to4-to-historic | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized bibtex | ||
Reviews | |||
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 support it. The advice to disable 6to4 by default has been widely adopted in recent operating systems, and the failure modes have been widely hidden from users by many browsers adopting the "Happy Eyeballs" approach [RFC6555].Show full document text