I-D Action:draft-despres-intarea-4rd-00.txt

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	Title           : IPv4 Residual Deployment across IPv6-Service networks (4rd) ISP-NAT's made optional
	Author(s)       : R. Despres, et al.
	Filename        : draft-despres-intarea-4rd-00.txt
	Pages           : 16
	Date            : 2011-03-07

This document specifies an automatic tunneling mechanism for
providing IPv4 connectivity service to end users over a service
provider's IPv6 network infrastructure.  During the long transition
period from IPv4-only to IPv6-only, a service provider's network
infrastructure will have to deploy IPv6.  But it will also have to
maintain some IPv4 connectivity for a number of customers, for both
outgoing and incoming connections, and for both customer-individual
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 infrastructures.  In some others it can be used in parallel
with NAT-based solutions such as DS-lite and/or NAT64/DNS4.

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