Extending an IPv6 /64 Prefix from a Third Generation Partnership Project (3GPP) Mobile Interface to a LAN Link
RFC 7278

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Internet Engineering Task Force (IETF)                          C. Byrne
Request for Comments: 7278                                  T-Mobile USA
Category: Informational                                         D. Drown
ISSN: 2070-1721                                                A. Vizdal
                                                     Deutsche Telekom AG
                                                               June 2014

                  Extending an IPv6 /64 Prefix from a
              Third Generation Partnership Project (3GPP)
                     Mobile Interface to a LAN Link

Abstract

   This document describes requirements for extending an IPv6 /64 prefix
   from a User Equipment Third Generation Partnership Project (3GPP)
   radio interface to a LAN link and describes two implementation
   examples.

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/rfc7278.

Byrne, et al.                 Informational                     [Page 1]
RFC 7278              Extending an IPv6 /64 Prefix             June 2014

Copyright Notice

   Copyright (c) 2014 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. The Challenge of Providing IPv6 Addresses to a LAN Link via a
      3GPP UE .........................................................4
   3. Requirements for Extending the 3GPP Interface /64 IPv6
      Prefix to a LAN Link ............................................4
   4. Example Methods for Extending the 3GPP Interface /64
      IPv6 Prefix to a LAN Link .......................................5
      4.1. General Behavior for All Example Scenarios .................5
      4.2. Example Scenario 1: Global Address Only Assigned to
           LAN Link ...................................................5
      4.3. Example Scenario 2: A Single Global Address Assigned to a
           3GPP Radio and LAN Link ....................................7
   5. Security Considerations .........................................8
   6. Acknowledgments .................................................8
   7. Informative References ..........................................8

Byrne, et al.                 Informational                     [Page 2]
RFC 7278              Extending an IPv6 /64 Prefix             June 2014

1.  Introduction

   3GPP mobile cellular networks such as Global System for Mobile
   Communications (GSM), Universal Mobile Telecommunications System
   (UMTS), and Long Term Evolution (LTE) have architectural support for
   IPv6 [RFC6459], but only 3GPP Release-10 and onwards of the 3GPP
   specification [TS.23401] supports DHCPv6 Prefix Delegation [RFC3633]
   for delegating IPv6 prefixes to a single LAN link.

   To facilitate the use of IPv6 in a LAN prior to the deployment of
   DHCPv6 Prefix Delegation in 3GPP networks and in User Equipment (UE),
   this document describes requirements and provides examples on how the
   3GPP UE radio interface assigned global /64 prefix may be extended
   from the 3GPP radio interface to a LAN link.

   There are two scenarios where this might be done.  The first is where
   the 3GPP node sets up and manages its own LAN (e.g., an IEEE 802.11
   Service Set Identifier (SSID)) and provides single-homed service to
   hosts that connect to this LAN.  A second scenario is where the 3GPP
   node connects to an existing LAN and acts as a router in order to
   provide redundant or multi-homed IPv6 service.

   This document is intended to address the first scenario; it is not
   applicable to the second scenario, because the operational
   complexities of the second scenario are not addressed.

   This can be achieved by receiving the Router Advertisement (RA)