RFC 2529 (rfc2529) - Page 1 of 10

Transmission of IPv6 over IPv4 Domains without Explicit Tunnels

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Network Working Group                                       B. Carpenter
Request for Comments: 2529                                           IBM
Category: Standards Track                                        C. Jung
                                                                    3Com
                                                              March 1999


    Transmission of IPv6 over IPv4 Domains without Explicit Tunnels

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) The Internet Society (1999).  All Rights Reserved.

Abstract

   This memo specifies the frame format for transmission of IPv6 [IPV6]
   packets and the method of forming IPv6 link-local addresses over IPv4
   domains.  It also specifies the content of the Source/Target Link-
   layer Address option used in the Router Solicitation, Router
   Advertisement, Neighbor Solicitation, and Neighbor Advertisement and
   Redirect messages, when those messages are transmitted on an IPv4
   multicast network.

   The motivation for this method is to allow isolated IPv6 hosts,
   located on a physical link which has no directly connected IPv6
   router, to become fully functional IPv6 hosts by using an IPv4 domain
   that supports IPv4 multicast as their virtual local link. It uses
   IPv4 multicast as a "virtual Ethernet".

Table of Contents

   1. Introduction....................................................2
   2. Maximum Transmission Unit.......................................2
   3. Frame Format....................................................3
   4. Stateless Autoconfiguration and Link-Local Addresses............3
   5. Address Mapping -- Unicast......................................4
   6. Address Mapping -- Multicast....................................4
   7. Scaling and Transition Isues....................................5
   8. IANA Considerations.............................................6
   9. Security Considerations.........................................6



Carpenter & Jung            Standards Track
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