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Default Address Selection for Internet Protocol Version 6 (IPv6) (RFC6724) Disclosure Number: IPCOM000221565D
Original Publication Date: 2012-Sep-01
Included in the Prior Art Database: 2012-Sep-11
Document File: 64 page(s) / 74K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

D. Thaler: AUTHOR [+5]


The IPv6 addressing architecture [RFC4291] allows multiple unicast addresses to be assigned to interfaces. These addresses might have different reachability scopes (link-local, site-local, or global). These addresses might also be "preferred" or "deprecated" [RFC4862]. Privacy considerations have introduced the concepts of "public addresses" and "temporary addresses" [RFC4941]. The mobility architecture introduces "home addresses" and "care-of addresses" [RFC6275]. In addition, multi-homing situations will result in more addresses per node. For example, a node might have multiple interfaces, some of them tunnels or virtual interfaces, or a site might have multiple ISP attachments with a global prefix per ISP.

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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)


   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

 Thaler, et al.               Standards Track                    [Page 1]
 RFC 6724           Default Address Selection for IPv6     September 2012