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Transition Mechanisms for IPv6 Hosts and Routers (RFC1933)

IP.com Disclosure Number: IPCOM000004239D
Original Publication Date: 1996-Apr-01
Included in the Prior Art Database: 2000-Sep-13
Document File: 18 page(s) / 44K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

R. Gilligan & E. Nordmark: AUTHOR

Abstract

This document specifies IPv4 compatibility mechanisms that can be implemented by IPv6 hosts and routers. These mechanisms include providing complete implementations of both versions of the Internet Protocol (IPv4 and IPv6), and tunneling IPv6 packets over IPv4 routing infrastructures. They are designed to allow IPv6 nodes to maintain complete compatibility with IPv4, which should greatly simplify the deployment of IPv6 in the Internet, and facilitate the eventual transition of the entire Internet to IPv6.

This text was extracted from a ASCII document.
This is the abbreviated version, containing approximately 6% of the total text.

Network Working Group R. Gilligan

Request for Comments: 1933 E. Nordmark

Category: Standards Track Sun Microsystems, Inc.

April 1996

Transition Mechanisms for IPv6 Hosts and Routers

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.

Abstract

This document specifies IPv4 compatibility mechanisms that can be

implemented by IPv6 hosts and routers. These mechanisms include

providing complete implementations of both versions of the Internet

Protocol (IPv4 and IPv6), and tunneling IPv6 packets over IPv4

routing infrastructures. They are designed to allow IPv6 nodes to

maintain complete compatibility with IPv4, which should greatly

simplify the deployment of IPv6 in the Internet, and facilitate the

eventual transition of the entire Internet to IPv6.

1. Introduction

The key to a successful IPv6 transition is compatibility with the

large installed base of IPv4 hosts and routers. Maintaining

compatibility with IPv4 while deploying IPv6 will streamline the task

of transitioning the Internet to IPv6. This specification defines a

set of mechanisms that IPv6 hosts and routers may implement in order

to be compatible with IPv4 hosts and routers.

The mechanisms in this document are designed to be employed by IPv6

hosts and routers that need to interoperate with IPv4 hosts and

utilize IPv4 routing infrastructures. We expect that most nodes in

the Internet will need such compatibility for a long time to come,

and perhaps even indefinitely.

However, IPv6 may be used in some environments where interoperability

with IPv4 is not required. IPv6 nodes that are designed to be used

in such environments need not use or even implement these mechanisms.

The mechanisms specified here include:

- Dual IP layer. Providing complete support for both IPv4 and

IPv6 in hosts and routers.

- IPv6 over IPv4 tunneling. Encapsulating IPv6 packets within

IPv4 headers to carry them over IPv4 routing infrastructures.

Two types of tunneling are employed: configured and automatic.

Additional transition and compatibility mechanisms may be developed

in the future. These will be specified in other documents.