Skip to main content

IPv4 Residual Deployment across IPv6-Service networks (4rd) ISP-NAT's made optional

Document Type Expired Internet-Draft (individual)
Authors Remi Despres , Satoru Matsushima , Tetsuya Murakami , Ole Trøan
Last updated 2011-03-14
Stream (None)
Intended RFC status (None)
Expired & archived
Stream Stream state (No stream defined)
Consensus boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Expired
Telechat date (None)
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


This document specifies an automatic tunneling mechanism for providing IPv4 connectivity service to end users over a service provider's IPv6 network. During the long transition period from IPv4 to IPv6-only, a service provider's network will have to support IPv6, but will also have to maintain some IPv4 connectivity for a number of customers, for both outgoing and incoming connections, and for both exclusive and shared IPv4 addresses. The 4rd solution (IPv4 Residual Deployment) is designed as a lightweight solution for this. In some scenarios, 4rd can dispense ISPs from supporting any NAT in their networks. In some others it can be used in parallel with NAT- based solutions such as DS-lite and/or NAT64/DNS4.


Remi Despres
Satoru Matsushima
Tetsuya Murakami
Ole Trøan

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)