Security and Privacy Considerations for IPv6 Address Generation Mechanisms
RFC 7721

Document Type RFC - Informational (March 2016; No errata)
Last updated 2016-03-09
Replaces draft-cooper-6man-ipv6-address-generation-privacy
Stream IETF
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Stream WG state Submitted to IESG for Publication
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IESG IESG state RFC 7721 (Informational)
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IANA IANA review state Version Changed - Review Needed
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Internet Engineering Task Force (IETF)                         A. Cooper
Request for Comments: 7721                                         Cisco
Category: Informational                                          F. Gont
ISSN: 2070-1721                                      Huawei Technologies
                                                               D. Thaler
                                                               Microsoft
                                                              March 2016

                Security and Privacy Considerations for
                   IPv6 Address Generation Mechanisms

Abstract

   This document discusses privacy and security considerations for
   several IPv6 address generation mechanisms, both standardized and
   non-standardized.  It evaluates how different mechanisms mitigate
   different threats and the trade-offs that implementors, developers,
   and users face in choosing different addresses or address generation
   mechanisms.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   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).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see 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/rfc7721.

Cooper, et al.                Informational                     [Page 1]
RFC 7721             IPv6 Address Generation Privacy          March 2016

Copyright Notice

   Copyright (c) 2016 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 . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Weaknesses in IEEE-Identifier-Based IIDs  . . . . . . . . . .   5
     3.1.  Correlation of Activities over Time . . . . . . . . . . .   5
     3.2.  Location Tracking . . . . . . . . . . . . . . . . . . . .   6
     3.3.  Address Scanning  . . . . . . . . . . . . . . . . . . . .   7
     3.4.  Device-Specific Vulnerability Exploitation  . . . . . . .   7
   4.  Privacy and Security Properties of Address Generation
       Mechanisms  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     4.1.  IEEE-Identifier-Based IIDs  . . . . . . . . . . . . . . .  10
     4.2.  Static, Manually Configured IIDs  . . . . . . . . . . . .  10
     4.3.  Constant, Semantically Opaque IIDs  . . . . . . . . . . .  10
     4.4.  Cryptographically Generated IIDs  . . . . . . . . . . . .  10
     4.5.  Stable, Semantically Opaque IIDs  . . . . . . . . . . . .  11
     4.6.  Temporary IIDs  . . . . . . . . . . . . . . . . . . . . .  11
     4.7.  DHCPv6 Generation of IIDs . . . . . . . . . . . . . . . .  12
     4.8.  Transition and Coexistence Technologies . . . . . . . . .  12
   5.  Miscellaneous Issues with IPv6 Addressing . . . . . . . . . .  13
     5.1.  Network Operation . . . . . . . . . . . . . . . . . . . .  13
     5.2.  Compliance  . . . . . . . . . . . . . . . . . . . . . . .  13
     5.3.  Intellectual Property Rights (IPRs) . . . . . . . . . . .  13
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  14
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  14
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  15
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  18
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  18

Cooper, et al.                Informational                     [Page 2]
RFC 7721             IPv6 Address Generation Privacy          March 2016

1.  Introduction

   IPv6 was designed to improve upon IPv4 in many respects, and
   mechanisms for address assignment were one such area for improvement.
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