IPv4 Support for Proxy Mobile IPv6
RFC 5844

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Internet Engineering Task Force (IETF)                       R. Wakikawa
Request for Comments: 5844                                    Toyota ITC
Category: Standards Track                                  S. Gundavelli
ISSN: 2070-1721                                                    Cisco
                                                                May 2010

                   IPv4 Support for Proxy Mobile IPv6

Abstract

   This document specifies extensions to the Proxy Mobile IPv6 protocol
   for adding IPv4 protocol support.  The scope of IPv4 protocol support
   is two-fold: 1) enable IPv4 home address mobility support to the
   mobile node, and 2) allow the mobility entities in the Proxy Mobile
   IPv6 domain to exchange signaling messages over an IPv4 transport
   network.

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/rfc5844.

Copyright Notice

   Copyright (c) 2010 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.

Wakikawa & Gundavelli        Standards Track                    [Page 1]
RFC 5844           IPv4 Support for Proxy Mobile IPv6           May 2010

Table of Contents

   1.  Overview . . . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1.  Stated Assumptions . . . . . . . . . . . . . . . . . . . .  4
     1.2.  Relevance to Dual-Stack Mobile IPv6  . . . . . . . . . . .  5
   2.  Conventions and Terminology  . . . . . . . . . . . . . . . . .  6
     2.1.  Conventions  . . . . . . . . . . . . . . . . . . . . . . .  6
     2.2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . .  6
   3.  IPv4 Home Address Mobility Support . . . . . . . . . . . . . .  8
     3.1.  Local Mobility Anchor Considerations . . . . . . . . . . .  9
       3.1.1.  Extensions to Binding Cache Entry  . . . . . . . . . .  9
       3.1.2.  Signaling Considerations . . . . . . . . . . . . . . . 10
       3.1.3.  Routing Considerations for the Local Mobility
               Anchor . . . . . . . . . . . . . . . . . . . . . . . . 15
       3.1.4.  ECN and Payload Fragmentation Considerations . . . . . 16
     3.2.  Mobile Access Gateway Considerations . . . . . . . . . . . 17
       3.2.1.  Extensions to Binding Update List Entry  . . . . . . . 17
       3.2.2.  Extensions to Mobile Node's Policy Profile . . . . . . 17
       3.2.3.  Signaling Considerations . . . . . . . . . . . . . . . 17
       3.2.4.  Routing Considerations for the Mobile Access
               Gateway  . . . . . . . . . . . . . . . . . . . . . . . 21
     3.3.  Mobility Options and Status Codes  . . . . . . . . . . . . 22
       3.3.1.  IPv4 Home Address Request Option . . . . . . . . . . . 22
       3.3.2.  IPv4 Home Address Reply Option . . . . . . . . . . . . 23
       3.3.3.  IPv4 Default-Router Address Option . . . . . . . . . . 25
       3.3.4.  IPv4 DHCP Support Mode Option  . . . . . . . . . . . . 25
       3.3.5.  Status Codes . . . . . . . . . . . . . . . . . . . . . 26
     3.4.  Supporting DHCP-Based Address Configuration  . . . . . . . 27
       3.4.1.  DHCP Server Co-Located with the Mobile Access
               Gateway  . . . . . . . . . . . . . . . . . . . . . . . 28
       3.4.2.  DHCP Relay Agent Co-Located with the Mobile Access
               Gateway  . . . . . . . . . . . . . . . . . . . . . . . 31
       3.4.3.  Common DHCP Considerations . . . . . . . . . . . . . . 33
   4.  IPv4 Transport Support . . . . . . . . . . . . . . . . . . . . 35
     4.1.  Local Mobility Anchor Considerations . . . . . . . . . . . 37
       4.1.1.  Extensions to Binding Cache Entry  . . . . . . . . . . 37
       4.1.2.  Extensions to Mobile Node's Policy Profile . . . . . . 37
       4.1.3.  Signaling Considerations . . . . . . . . . . . . . . . 37
       4.1.4.  Routing Considerations . . . . . . . . . . . . . . . . 39
     4.2.  Mobile Access Gateway Considerations . . . . . . . . . . . 40
       4.2.1.  Extensions to Binding Update List Entry  . . . . . . . 40