DHCPv6 Option for IPv4-Embedded Multicast and Unicast IPv6 Prefixes
RFC 8115

Document Type RFC - Proposed Standard (March 2017; No errata)
Last updated 2017-03-17
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Stream WG state Submitted to IESG for Publication
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IESG IESG state RFC 8115 (Proposed Standard)
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Internet Engineering Task Force (IETF)                      M. Boucadair
Request for Comments: 8115                                        Orange
Category: Standards Track                                         J. Qin
ISSN: 2070-1721                                                    Cisco
                                                                 T. Tsou
                                                        Philips Lighting
                                                                 X. Deng
                                       The University of New South Wales
                                                              March 2017

  DHCPv6 Option for IPv4-Embedded Multicast and Unicast IPv6 Prefixes

Abstract

   This document defines a Dynamic Host Configuration Protocol version 6
   (DHCPv6) Option for multicast IPv4 service continuity solutions,
   which is used to carry the IPv6 prefixes to be used to build unicast
   and multicast IPv4-embedded IPv6 addresses.

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 7841.

   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/rfc8115.

Copyright Notice

   Copyright (c) 2017 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.

Boucadair, et al.            Standards Track                    [Page 1]
RFC 8115           IPv4/IPv6 Multicast Prefixes Option        March 2017

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  OPTION_V6_PREFIX64 DHCPv6 Option  . . . . . . . . . . . . . .   3
   4.  DHCPv6 Client Behavior  . . . . . . . . . . . . . . . . . . .   5
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Appendix A.  Configuration Recommendations for DHCP Servers . . .   8
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   Several solutions (e.g., [RFC8114]) are proposed for the delivery of
   multicast services in the context of transition to IPv6.  Even if
   these solutions may have different applicable use cases, they all use
   specific IPv6 addresses that embed IPv4 addresses, for both multicast
   group and source addresses.

   This document defines a DHCPv6 option [RFC3315] that carries the IPv6
   prefixes to be used for constructing these IPv4-embedded IPv6
   addresses.

   In particular, this option can be used in the context of Dual-Stack
   Lite (DS-Lite) [RFC6333], Stateless Address plus Port (A+P)
   [RFC6346], and other IPv4-IPv6 transition techniques.

1.1.  Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

2.  Terminology

   This document makes use of the following terms:

   IPv4-embedded IPv6 address:  an IPv6 address that embeds a 32-bit-
      encoded IPv4 address [RFC6052].  An IPv4-embedded IPv6 address can
      be a unicast or a multicast address.

Boucadair, et al.            Standards Track                    [Page 2]
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