A method for Generating Stable Privacy-Enhanced Addresses with IPv6 Stateless Address Autoconfiguration (SLAAC)
draft-ietf-6man-stable-privacy-addresses-08
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IPv6 maintenance Working Group (6man) F. Gont
Internet-Draft SI6 Networks / UTN-FRH
Intended status: Standards Track May 24, 2013
Expires: November 25, 2013
A method for Generating Stable Privacy-Enhanced Addresses with IPv6
Stateless Address Autoconfiguration (SLAAC)
draft-ietf-6man-stable-privacy-addresses-08
Abstract
This document specifies a method for generating IPv6 Interface
Identifiers to be used with IPv6 Stateless Address Autoconfiguration
(SLAAC), such that addresses configured using this method are stable
within each subnet, but the Interface Identifier changes when hosts
move from one network to another. This method is meant to be an
alternative to generating Interface Identifiers based on hardware
address (e.g., using IEEE identifiers), such that the benefits of
stable addresses can be achieved without sacrificing the 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 addresses.
Status of this Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on November 25, 2013.
Copyright Notice
Copyright (c) 2013 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
Gont Expires November 25, 2013 [Page 1]
Internet-Draft Stable Privacy Addresses May 2013
(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. Design goals . . . . . . . . . . . . . . . . . . . . . . . . . 6
3. Algorithm specification . . . . . . . . . . . . . . . . . . . 7
4. Resolving Duplicate Address Detection (DAD) conflicts . . . . 12
5. Specified Constants . . . . . . . . . . . . . . . . . . . . . 13
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 14
7. Security Considerations . . . . . . . . . . . . . . . . . . . 15
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 17
9. References . . . . . . . . . . . . . . . . . . . . . . . . . . 18
9.1. Normative References . . . . . . . . . . . . . . . . . . . 18
9.2. Informative References . . . . . . . . . . . . . . . . . . 18
Appendix A. Possible sources for the Net_Iface parameter . . . . 21
A.1. Interface Index . . . . . . . . . . . . . . . . . . . . . 21
A.2. Interface Name . . . . . . . . . . . . . . . . . . . . . . 21
A.3. Link-layer Addresses . . . . . . . . . . . . . . . . . . . 21
A.4. Logical Network Service Identity . . . . . . . . . . . . . 22
Appendix B. Privacy issues still present when temporary
addresses are employed . . . . . . . . . . . . . . . 23
B.1. Host tracking . . . . . . . . . . . . . . . . . . . . . . 23
B.1.1. Tracking hosts across networks #1 . . . . . . . . . . 23
B.1.2. Tracking hosts across networks #2 . . . . . . . . . . 24
B.1.3. Revealing the identity of devices performing
server-like functions . . . . . . . . . . . . . . . . 24
B.2. Address-scanning attacks . . . . . . . . . . . . . . . . . 24
B.3. Information Leakage . . . . . . . . . . . . . . . . . . . 25
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 26
Gont Expires November 25, 2013 [Page 2]
Internet-Draft Stable Privacy Addresses May 2013
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
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