Default Address Selection for Internet Protocol Version 6 (IPv6)
RFC 6724
Document | Type |
RFC - Proposed Standard
(September 2012; Errata)
Obsoletes RFC 3484
|
|
---|---|---|---|
Authors | Dave Thaler , Richard Draves , Arifumi Matsumoto , Tim Chown | ||
Last updated | 2020-01-21 | ||
Replaces | draft-ietf-6man-rfc3484-revise | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized with errata bibtex | ||
Reviews | |||
Stream | WG state | WG Document | |
Document shepherd | No shepherd assigned | ||
Shepherd write-up | Show (last changed 2012-05-16) | ||
IESG | IESG state | RFC 6724 (Proposed Standard) | |
Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Brian Haberman | ||
IESG note | Bob Hinden (bob.hinden@gmail.com) is the document shepherd. | ||
Send notices to | (None) |
Internet Engineering Task Force (IETF) D. Thaler, Ed. Request for Comments: 6724 Microsoft Obsoletes: 3484 R. Draves Category: Standards Track Microsoft Research ISSN: 2070-1721 A. Matsumoto NTT T. Chown University of Southampton September 2012 Default Address Selection for Internet Protocol Version 6 (IPv6) Abstract This document describes two algorithms, one for source address selection and one for destination address selection. The algorithms specify default behavior for all Internet Protocol version 6 (IPv6) implementations. They do not override choices made by applications or upper-layer protocols, nor do they preclude the development of more advanced mechanisms for address selection. The two algorithms share a common context, including an optional mechanism for allowing administrators to provide policy that can override the default behavior. In dual-stack implementations, the destination address selection algorithm can consider both IPv4 and IPv6 addresses -- depending on the available source addresses, the algorithm might prefer IPv6 addresses over IPv4 addresses, or vice versa. Default address selection as defined in this specification applies to all IPv6 nodes, including both hosts and routers. This document obsoletes RFC 3484. Status of This Memo This is an Internet Standards Track document. 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 Internet Standards 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/rfc6724. Thaler, et al. Standards Track [Page 1] RFC 6724 Default Address Selection for IPv6 September 2012 Copyright Notice Copyright (c) 2012 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. Conventions Used in This Document ..........................4 2. Context in Which the Algorithms Operate .........................4 2.1. Policy Table ...............................................6 2.2. Common Prefix Length .......................................7 3. Address Properties ..............................................7 3.1. Scope Comparisons ..........................................8 3.2. IPv4 Addresses and IPv4-Mapped Addresses ...................8 3.3. Other IPv6 Addresses with Embedded IPv4 Addresses ..........9 3.4. IPv6 Loopback Address and Other Format Prefixes ............9 3.5. Mobility Addresses .........................................9 4. Candidate Source Addresses .....................................10 5. Source Address Selection .......................................11 6. Destination Address Selection ..................................14 7. Interactions with Routing ......................................16 8. Implementation Considerations ..................................16 9. Security Considerations ........................................17 10. Examples ......................................................18 10.1. Default Source Address Selection .........................18 10.2. Default Destination Address Selection ....................19 10.3. Configuring Preference for IPv6 or IPv4 ..................20 10.3.1. Handling Broken IPv6 ..............................21 10.4. Configuring Preference for Link-Local Addresses ..........21 10.5. Configuring a Multi-Homed Site ...........................22 10.6. Configuring ULA Preference ...............................24Show full document text