v6 has subnet anycast... done and done!
never published Network Working Group R. Bush Internet-Draft IIJ Intended status: Standards Track August 2010 Expires: February 2, 2011 IPv6 Subnet Anycast Deprecated draft-ymbk-no-subnet-anycast-00 Abstract IPv6 subnet anycast is not used operationally, complicates implementations, and complicates protocol specifications. The form of anycast actually used in the Internet is routing-based, and is essentilly the same as that of IPv4 anycast. Therefore, this document deprecates IPv6 subnet anycast. Status of this Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. This document may not be modified, and derivative works of it may not be created, and it may not be published except as an Internet-Draft. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at http://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on February 2, 2011. Copyright Notice Copyright (c) 2010 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 Bush Expires February 2, 2011 [Page 1] Internet-Draft IPv6 Subnet Anycast Deprecated August 2010 the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Security Considerations . . . . . . . . . . . . . . . . . . . . 3 3. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 3 4. References . . . . . . . . . . . . . . . . . . . . . . . . . . 3 4.1. Normative References . . . . . . . . . . . . . . . . . . . 3 4.2. Informative References . . . . . . . . . . . . . . . . . . 3 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 4 Bush Expires February 2, 2011 [Page 2] Internet-Draft IPv6 Subnet Anycast Deprecated August 2010 1. Introduction The form of anycast which is used in the operational internet is described in [RFC4786]. This is used widely in IPv4 and IPv6. To quote, "To distribute a service using anycast, the service is first associated with a stable set of IP addresses, and reachability to those addresses is advertised in a routing system from multiple, independent service nodes." IPv6 subnet anycast, as defined in [RFC2526], complicates host and router stacks. It also makes address assignment unnecessarily complex, see [I-D.kohno-ipv6-prefixlen-p2p]. IPv6 subnet anycast is not actually used or deployed. In this case, it is sure that implementations are not even debugged. Therefore, this document deprecates IPv6 subnet anycast and removes conformance requirements from host and router implementations. 2. Security Considerations There are no known security implications for this document. 3. IANA Considerations This document has no IANA Considerations. 4. References 4.1. Normative References [RFC2526] Johnson, D. and S. Deering, "Reserved IPv6 Subnet Anycast Addresses", RFC 2526, March 1999. 4.2. Informative References [I-D.kohno-ipv6-prefixlen-p2p] Kohno, M., Nitzan, B., Bush, R., Matsuzaki, Y., and L. Colitti, "Using 127-bit IPv6 Prefixes on Inter-Router Links", draft-kohno-ipv6-prefixlen-p2p-02 (work in progress), July 2010. [RFC4786] Abley, J. and K. Lindqvist, "Operation of Anycast Bush Expires February 2, 2011 [Page 3] Internet-Draft IPv6 Subnet Anycast Deprecated August 2010 Services", BCP 126, RFC 4786, December 2006. Author's Address Randy Bush Internet Initiative Japan, Inc. 5147 Crystal Springs Bainbridge Island, Washington 98110 US Phone: +1 206 780 0431 x1 Email: randy@psg.com Bush Expires February 2, 2011 [Page 4]