Privacy Considerations for DHCP
RFC 7819

Document Type RFC - Informational (April 2016; No errata)
Last updated 2016-04-30
Replaces draft-jiang-dhc-dhcp-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 7819 (Informational)
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Responsible AD Brian Haberman
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IANA IANA review state Version Changed - Review Needed
IANA action state No IC
Internet Engineering Task Force (IETF)                          S. Jiang
Request for Comments: 7819                  Huawei Technologies Co., Ltd
Category: Informational                                      S. Krishnan
ISSN: 2070-1721                                                 Ericsson
                                                            T. Mrugalski
                                                                     ISC
                                                              April 2016

                    Privacy Considerations for DHCP

Abstract

   DHCP is a protocol that is used to provide addressing and
   configuration information to IPv4 hosts.  This document discusses the
   various identifiers used by DHCP and the potential privacy issues.

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/rfc7819.

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.

Jiang, et al.                 Informational                     [Page 1]
RFC 7819               DHCP Privacy Considerations            April 2016

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Requirements Language and Terminology . . . . . . . . . . . .   3
   3.  DHCP Options Carrying Identifiers . . . . . . . . . . . . . .   4
     3.1.  Client Identifier Option  . . . . . . . . . . . . . . . .   4
     3.2.  Address Fields and Options  . . . . . . . . . . . . . . .   4
     3.3.  Client FQDN Option  . . . . . . . . . . . . . . . . . . .   5
     3.4.  Parameter Request List Option . . . . . . . . . . . . . .   5
     3.5.  Vendor Class and Vendor-Identifying Vendor Class Options    5
     3.6.  Civic Location Option . . . . . . . . . . . . . . . . . .   6
     3.7.  Coordinate-Based Location Option  . . . . . . . . . . . .   6
     3.8.  Client System Architecture Type Option  . . . . . . . . .   6
     3.9.  Relay Agent Information Option and Suboptions . . . . . .   6
   4.  Existing Mechanisms That Affect Privacy . . . . . . . . . . .   7
     4.1.  DNS Updates . . . . . . . . . . . . . . . . . . . . . . .   7
     4.2.  Allocation Strategies . . . . . . . . . . . . . . . . . .   7
   5.  Attacks . . . . . . . . . . . . . . . . . . . . . . . . . . .   9
     5.1.  Device Type Discovery . . . . . . . . . . . . . . . . . .   9
     5.2.  Operating System Discovery  . . . . . . . . . . . . . . .   9
     5.3.  Finding Location Information  . . . . . . . . . . . . . .   9
     5.4.  Finding Previously Visited Networks . . . . . . . . . . .   9
     5.5.  Finding a Stable Identity . . . . . . . . . . . . . . . .   9
     5.6.  Pervasive Monitoring  . . . . . . . . . . . . . . . . . .  10
     5.7.  Finding Client's IP Address or Hostname . . . . . . . . .  10
     5.8.  Correlation of Activities over Time . . . . . . . . . . .  10
     5.9.  Location Tracking . . . . . . . . . . . . . . . . . . . .  10
     5.10. Leasequery and Bulk Leasequery  . . . . . . . . . . . . .  11
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  11
   7.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .  11
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  12
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  12
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  12
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  14
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  14

Jiang, et al.                 Informational                     [Page 2]
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