datatracker.ietf.org
Sign in
Version 5.6.2.p3, 2014-07-31
Report a bug

A Method for Generating Semantically Opaque Interface Identifiers with IPv6 Stateless Address Autoconfiguration (SLAAC)
RFC 7217

Internet Engineering Task Force (IETF)                           F. Gont
Request for Comments: 7217                        SI6 Networks / UTN-FRH
Category: Standards Track                                     April 2014
ISSN: 2070-1721

   A Method for Generating Semantically Opaque Interface Identifiers
         with IPv6 Stateless Address Autoconfiguration (SLAAC)

Abstract

   This document specifies a method for generating IPv6 Interface
   Identifiers to be used with IPv6 Stateless Address Autoconfiguration
   (SLAAC), such that an IPv6 address configured using this method is
   stable within each subnet, but the corresponding Interface Identifier
   changes when the host moves from one network to another.  This method
   is meant to be an alternative to generating Interface Identifiers
   based on hardware addresses (e.g., IEEE LAN Media Access Control
   (MAC) addresses), such that the benefits of stable addresses can be
   achieved without sacrificing the security and privacy of users.  The
   method specified in this document applies to all prefixes a host may
   be employing, including link-local, global, and unique-local prefixes
   (and their corresponding addresses).

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/rfc7217.

Gont                         Standards Track                    [Page 1]
RFC 7217            Stable and Opaque IIDs with SLAAC         April 2014

Copyright Notice

   Copyright (c) 2014 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
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  Relationship to Other Standards . . . . . . . . . . . . . . .   5
   4.  Design Goals  . . . . . . . . . . . . . . . . . . . . . . . .   6
   5.  Algorithm Specification . . . . . . . . . . . . . . . . . . .   7
   6.  Resolving DAD Conflicts . . . . . . . . . . . . . . . . . . .  12
   7.  Specified Constants . . . . . . . . . . . . . . . . . . . . .  13
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  15
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  15
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  15
     10.2.  Informative References . . . . . . . . . . . . . . . . .  16
   Appendix A.  Possible Sources for the Net_Iface Parameter . . . .  19
     A.1.  Interface Index . . . . . . . . . . . . . . . . . . . . .  19
     A.2.  Interface Name  . . . . . . . . . . . . . . . . . . . . .  19
     A.3.  Link-Layer Addresses  . . . . . . . . . . . . . . . . . .  19
     A.4.  Logical Network Service Identity  . . . . . . . . . . . .  20

Gont                         Standards Track                    [Page 2]
RFC 7217            Stable and Opaque IIDs with SLAAC         April 2014

1.  Introduction

   [RFC4862] specifies Stateless Address Autoconfiguration (SLAAC) for
   IPv6 [RFC2460], which typically results in hosts configuring one or
   more "stable" addresses composed of a network prefix advertised by a
   local router, and an Interface Identifier (IID) that typically embeds
   a hardware address (e.g., an IEEE LAN MAC address) [RFC4291].
   Cryptographically Generated Addresses (CGAs) [RFC3972] are yet
   another method for generating Interface Identifiers; CGAs bind a
   public signature key to an IPv6 address in the SEcure Neighbor
   Discovery (SEND) [RFC3971] protocol.

   Generally, the traditional SLAAC addresses are thought to simplify
   network management, since they simplify Access Control Lists (ACLs)

[include full document text]