Privacy Considerations for DHCPv6
RFC 7824

Document Type RFC - Informational (May 2016; No errata)
Last updated 2016-05-17
Replaces draft-krishnan-dhc-dhcpv6-privacy
Stream IETF
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Stream WG state Submitted to IESG for Publication Aug 2015 Jan 2016
Document shepherd Bernie Volz
Shepherd write-up Show (last changed 2016-01-12)
IESG IESG state RFC 7824 (Informational)
Consensus Boilerplate Yes
Telechat date
Responsible AD Brian Haberman
Send notices to (None)
IANA IANA review state Version Changed - Review Needed
IANA action state No IC
Internet Engineering Task Force (IETF)                       S. Krishnan
Request for Comments: 7824                                      Ericsson
Category: Informational                                     T. Mrugalski
ISSN: 2070-1721                                                      ISC
                                                                S. Jiang
                                           Huawei Technologies Co., Ltd.
                                                                May 2016

                   Privacy Considerations for DHCPv6

Abstract

   DHCPv6 is a protocol that is used to provide addressing and
   configuration information to IPv6 hosts.  This document describes the
   privacy issues associated with the use of DHCPv6 by Internet users.
   It is intended to be an analysis of the present situation and does
   not propose any solutions.

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/rfc7824.

Krishnan, et al.              Informational                     [Page 1]
RFC 7824              DHCPv6 Privacy Considerations             May 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.

Krishnan, et al.              Informational                     [Page 2]
RFC 7824              DHCPv6 Privacy Considerations             May 2016

Table of Contents

   1. Introduction ....................................................4
   2. Terminology .....................................................4
   3. Identifiers in DHCPv6 Options and Fields ........................5
      3.1. Source IPv6 Address ........................................5
      3.2. DUID .......................................................5
      3.3. Client Identifier Option ...................................6
      3.4. IA_NA, IA_TA, IA_PD, IA Address, and IA Prefix Options .....6
      3.5. Client FQDN Option .........................................6
      3.6. Client Link-Layer Address Option ...........................7
      3.7. Option Request Option ......................................7
      3.8. Vendor Class and Vendor-Specific Information Options .......7
      3.9. Civic Location Option ......................................8
      3.10. Coordinate-Based Location Option ..........................8
      3.11. Client System Architecture Type Option ....................8
      3.12. Relay Agent Options .......................................8
           3.12.1. Subscriber-ID Option ...............................9
           3.12.2. Interface ID Option ................................9
           3.12.3. Remote ID Option ...................................9
           3.12.4. Relay-ID Option ....................................9
   4. Existing Mechanisms That Affect Privacy ........................10
      4.1. Temporary Addresses .......................................10
      4.2. DNS Updates ...............................................10
      4.3. Allocation Strategies .....................................10
   5. Attacks ........................................................12
      5.1. Device Type Discovery (Fingerprinting) ....................12
      5.2. Operating System Discovery (Fingerprinting) ...............12
      5.3. Finding Location Information ..............................12
      5.4. Finding Previously Visited Networks .......................13
      5.5. Finding a Stable Identity .................................13
      5.6. Pervasive Monitoring ......................................13
      5.7. Finding a Client's IP Address or Hostname .................14
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