DHCPv6-Shield: Protecting against Rogue DHCPv6 Servers
RFC 7610

Document Type RFC - Best Current Practice (August 2015; No errata)
Also known as BCP 199
Last updated 2015-10-14
Replaces draft-gont-opsec-dhcpv6-shield
Stream IETF
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Stream WG state Submitted to IESG for Publication
Document shepherd KK Chittimaneni
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IESG IESG state RFC 7610 (Best Current Practice)
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Responsible AD Joel Jaeggli
Send notices to brian.e.carpenter@gmail.com
IANA IANA review state Version Changed - Review Needed
IANA action state No IC
Internet Engineering Task Force (IETF)                           F. Gont
Request for Comments: 7610                        SI6 Networks / UTN-FRH
BCP: 199                                                          W. Liu
Category: Best Current Practice                      Huawei Technologies
ISSN: 2070-1721                                          G. Van de Velde
                                                          Alcatel-Lucent
                                                             August 2015

         DHCPv6-Shield: Protecting against Rogue DHCPv6 Servers

Abstract

   This document specifies a mechanism for protecting hosts connected to
   a switched network against rogue DHCPv6 servers.  It is based on
   DHCPv6 packet filtering at the layer 2 device at which the packets
   are received.  A similar mechanism has been widely deployed in IPv4
   networks ('DHCP snooping'); hence, it is desirable that similar
   functionality be provided for IPv6 networks.  This document specifies
   a Best Current Practice for the implementation of DHCPv6-Shield.

Status of This Memo

   This memo documents an Internet Best Current Practice.

   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
   BCPs 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/rfc7610.

Gont, et al.              Best Current Practice                 [Page 1]
RFC 7610                      DHCPv6-Shield                  August 2015

Copyright Notice

   Copyright (c) 2015 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. Requirements Language ...........................................3
   3. Terminology .....................................................3
   4. DHCPv6-Shield Configuration .....................................5
   5. DHCPv6-Shield Implementation Requirements .......................5
   6. Security Considerations .........................................7
   7. References ......................................................9
      7.1. Normative References .......................................9
      7.2. Informative References ....................................10
   Acknowledgements ..................................................11
   Authors' Addresses ................................................12

Gont, et al.              Best Current Practice                 [Page 2]
RFC 7610                      DHCPv6-Shield                  August 2015

1.  Introduction

   This document specifies DHCPv6-Shield, a mechanism for protecting
   hosts connected to a switched network against rogue DHCPv6 servers
   [RFC3315].  The basic concept behind DHCPv6-Shield is that a layer 2
   device filters DHCPv6 messages intended for DHCPv6 clients
   (henceforth, "DHCPv6-server messages"), according to a number of
   different criteria.  The most basic filtering criterion is that
   DHCPv6-server messages are discarded by the layer 2 device unless
   they are received on specific ports of the layer 2 device.

   Before the DHCPv6-Shield device is deployed, the administrator
   specifies the layer 2 port(s) on which DHCPv6-server messages are to
   be allowed.  Only those ports to which a DHCPv6 server or relay is to
   be connected should be specified as such.  Once deployed, the
   DHCPv6-Shield device inspects received packets and allows (i.e.,
   passes) DHCPv6-server messages only if they are received on layer 2
   ports that have been explicitly configured for such purpose.

   DHCPv6-Shield is analogous to the Router Advertisement Guard
   (RA-Guard) mechanism [RFC6104] [RFC6105] [RFC7113], intended for
   protection against rogue Router Advertisement [RFC4861] messages.

   We note that DHCPv6-Shield mitigates only DHCPv6-based attacks
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