Anonymity Profiles for DHCP Clients
RFC 7844

Document Type RFC - Proposed Standard (May 2016; No errata)
Last updated 2016-05-17
Replaces draft-huitema-dhc-anonymity-profile
Stream IETF
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Reviews
Stream WG state Submitted to IESG for Publication Aug 2015 Jan 2016
Document shepherd Bernie Volz
Shepherd write-up Show (last changed 2016-01-13)
IESG IESG state RFC 7844 (Proposed Standard)
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)                        C. Huitema
Request for Comments: 7844                                     Microsoft
Category: Standards Track                                   T. Mrugalski
ISSN: 2070-1721                                                      ISC
                                                             S. Krishnan
                                                                Ericsson
                                                                May 2016

                  Anonymity Profiles for DHCP Clients

Abstract

   Some DHCP options carry unique identifiers.  These identifiers can
   enable device tracking even if the device administrator takes care of
   randomizing other potential identifications like link-layer addresses
   or IPv6 addresses.  The anonymity profiles are designed for clients
   that wish to remain anonymous to the visited network.  The profiles
   provide guidelines on the composition of DHCP or DHCPv6 messages,
   designed to minimize disclosure of identifying information.

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/rfc7844.

Huitema, et al.              Standards Track                    [Page 1]
RFC 7844                 DHCP Anonymity Profiles                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.

Huitema, et al.              Standards Track                    [Page 2]
RFC 7844                 DHCP Anonymity Profiles                May 2016

Table of Contents

   1. Introduction ....................................................4
      1.1. Requirements ...............................................4
   2. Application Domain ..............................................4
      2.1. MAC Address Randomization Hypotheses .......................5
      2.2. MAC Address Randomization and DHCP .........................6
      2.3. Radio Fingerprinting .......................................6
      2.4. Operating System Fingerprinting ............................7
      2.5. No Anonymity Profile Identification ........................7
      2.6. Using the Anonymity Profiles ...............................8
      2.7. What about privacy for DHCP servers? .......................9
   3. Anonymity Profile for DHCPv4 ....................................9
      3.1. Avoiding Fingerprinting ...................................10
      3.2. Client IP Address Field ...................................10
      3.3. Requested IP Address Option ...............................11
      3.4. Client Hardware Address Field .............................12
      3.5. Client Identifier Option ..................................12
      3.6. Parameter Request List Option .............................13
      3.7. Host Name Option ..........................................13
      3.8. Client FQDN Option ........................................14
      3.9. UUID/GUID-Based Client Machine Identifier Option ..........15
      3.10. User and Vendor Class DHCP Options .......................15
   4. Anonymity Profile for DHCPv6 ...................................15
      4.1. Avoiding Fingerprinting ...................................16
      4.2. Do not send Confirm messages, unless really sure about
           the location ..............................................17
      4.3. Client Identifier DHCPv6 Option ...........................17
           4.3.1. Anonymous Information-request ......................18
      4.4. Server Identifier Option ..................................18
      4.5. Address Assignment Options ................................18
           4.5.1. Obtain Temporary Addresses .........................19
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