Relay-Supplied DHCP Options
RFC 6422

 
Document Type RFC - Proposed Standard (December 2011; No errata)
Updates RFC 3315
Last updated 2013-03-02
Stream IETF
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Stream WG state WG Document
Consensus Unknown
Document shepherd No shepherd assigned
IESG IESG state RFC 6422 (Proposed Standard)
Telechat date
Responsible AD Ralph Droms
IESG note John Brzozowski <John_Brzozowski@Cable.Comcast.com> is the document shepherd.
Send notices to dhc-chairs@ietf.org, draft-ietf-dhc-dhcpv6-relay-supplied-options@ietf.org
Internet Engineering Task Force (IETF)                          T. Lemon
Request for Comments: 6422                                       Nominum
Updates: 3315                                                      Q. Wu
Category: Standards Track                                         Huawei
ISSN: 2070-1721                                            December 2011

                      Relay-Supplied DHCP Options

Abstract

   DHCPv6 relay agents cannot communicate with DHCPv6 clients directly.
   However, in some cases, the relay agent possesses some information
   that would be useful to the DHCPv6 client.  This document describes a
   mechanism whereby the DHCPv6 relay agent can provide such information
   to the DHCPv6 server, which can, in turn, pass this information on to
   the DHCP client.

   This document updates RFC 3315 (DHCPv6) by making explicit the
   implicit requirement that relay agents not modify the content of
   encapsulation payloads as they are relayed back toward clients.

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/rfc6422.

Lemon & Wu                   Standards Track                    [Page 1]
RFC 6422               Relay-Supplied DHCP Options         December 2011

Copyright Notice

   Copyright (c) 2011 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 ....................................................2
      1.1. Requirements Language ......................................3
      1.2. Terminology ................................................3
   2. Protocol Summary ................................................3
   3. Encoding ........................................................3
   4. RSOO-Enabled Options ............................................4
   5. DHCP Relay Agent Behavior .......................................4
   6. DHCP Server Behavior ............................................5
   7. Security Considerations .........................................6
   8. IANA Considerations .............................................7
   9. References ......................................................7
      9.1. Normative References .......................................7
      9.2. Informative References .....................................7

1.  Introduction

   The DHCPv6 specification [RFC3315] allows DHCP relay agents to
   forward DHCPv6 messages between clients and servers that are not on
   the same IPv6 link.  In some cases, the DHCP relay agent has
   information not available to the DHCP server that would be useful to
   provide to a DHCP client.  For example, the DHCP client may need to
   learn the EAP Re-authentication Protocol (ERP) local domain name
   [RFC6440] for use in EAP re-authentication [RFC5296], which is known
   to the relay agent but not the server.

   The DHCPv6 protocol specification does not provide a mechanism
   whereby the relay agent can provide options to the client.  This
   document extends DHCP with a mechanism that allows DHCP relay agents
   to propose options for the server to send to DHCP clients.

Lemon & Wu                   Standards Track                    [Page 2]
RFC 6422               Relay-Supplied DHCP Options         December 2011

   This document is not intended to provide a general mechanism for
   storing client configuration information in the relay agent.  Rather,
   it is intended to address specific use cases where only the relay
   agent has information needed by the client.  This extension is not
   applicable to DHCP options in general, but rather provided as a
   mechanism for new specifications that require this functionality.
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