Default Address Selection for Internet Protocol Version 6 (IPv6)
RFC 6724
| Document | Type |
RFC - Proposed Standard
(September 2012; Errata)
Obsoletes RFC 3484
|
|
|---|---|---|---|
| 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 ...............................24
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