Dual-Stack Mobile IPv4
RFC 5454

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Network Working Group                                        G. Tsirtsis
Request for Comments: 5454                                       V. Park
Category: Standards Track                                       Qualcomm
                                                              H. Soliman
                                                    Elevate Technologies
                                                              March 2009

                         Dual-Stack Mobile IPv4

Status of This Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (c) 2009 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 in effect on the date of
   publication of this document (http://trustee.ietf.org/license-info).
   Please review these documents carefully, as they describe your rights
   and restrictions with respect to this document.

Abstract

   This specification provides IPv6 extensions to the Mobile IPv4
   protocol.  The extensions allow a dual-stack node to use IPv4 and
   IPv6 home addresses as well as to move between IPv4 and dual stack
   network infrastructures.

Tsirtsis, et al.            Standards Track                     [Page 1]
RFC 5454                 Dual-Stack Mobile IPv4               March 2009

Table of Contents

   1. Introduction ....................................................3
      1.1. Requirements Notation ......................................3
      1.2. Goals ......................................................3
      1.3. Non-Goals ..................................................4
      1.4. Implicit and Explicit Modes ................................4
   2. Extension Formats ...............................................4
      2.1. IPv6 Prefix Request Extension ..............................4
      2.2. IPv6 Prefix Reply Extension ................................5
      2.3. IPv6 Tunneling Mode Extension ..............................7
   3. Mobile IP Registrations .........................................8
      3.1. Registration Request .......................................8
      3.2. Registration Reply .........................................8
      3.3. Home Agent Considerations ..................................9
           3.3.1. IPv6 Reachability ..................................10
           3.3.2. Processing Intercepted IPv6 Packets ................10
           3.3.3. IPv6 Multicast Membership Control ..................12
      3.4. Foreign Agent Considerations ..............................12
      3.5. Mobile Node Considerations ................................12
      3.6. Tunneling Impacts .........................................13
      3.7. IPv6 Prefixes .............................................14
           3.7.1. Dynamic IPv6 Prefix Delegation .....................14
      3.8. Deregistration of IPv6 Prefix .............................15
      3.9. Registration with a Private CoA ...........................15
   4. Security Considerations ........................................15
   5. IANA Considerations ............................................16
   6. Acknowledgements ...............................................16
   7. References .....................................................16
      7.1. Normative References ......................................16
      7.2. Informative References ....................................17

Tsirtsis, et al.            Standards Track                     [Page 2]
RFC 5454                 Dual-Stack Mobile IPv4               March 2009

1.  Introduction

   Mobile IPv4 [RFC3344] allows a mobile node with an IPv4 address to
   maintain communications while moving in an IPv4 network.

   Extensions defined in this document allow a node that has IPv4 and
   IPv6 addresses [RFC2460] to maintain communications through any of
   its addresses while moving in IPv4 or dual stack networks.

   Essentially, this specification separates the Mobile IPv4 signaling
   from the IP version of the traffic it tunnels.  Mobile IPv4 with the
   present extensions remains a signaling protocol that runs over IPv4,
   and yet can set up both IPv4 and IPv6 tunnels over IPv4.

   The aim is two-fold:

      On one hand, Mobile IPv4 with the present extensions becomes a
      useful transition mechanism, allowing automated but controlled
      tunneling of IPv6 traffic over IPv4 tunnels.  Dual-stack nodes in
      dual-stack home networks can now roam to and from legacy IPv4
      networks, while IPv4 mobile nodes and networks can migrate to IPv6