Lightweight 4over6: An Extension to the DS-Lite Architecture

Document Type Replaced Internet-Draft (softwire WG)
Last updated 2013-04-16 (latest revision 2013-02-25)
Replaced by draft-ietf-softwire-lw4over6
Stream IETF
Intended RFC status (None)
Expired & archived
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Stream WG state Adopted by a WG
Document shepherd No shepherd assigned
IESG IESG state Replaced by draft-ietf-softwire-lw4over6
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


DS-Lite [RFC6333] describes an architecture for transporting IPv4 packets over an IPv6 network. This document specifies an extension to DS-Lite called Lightweight 4over6 which moves the Network Address Translation function from the DS-Lite AFTR to the B4, removing the requirement for a Carrier Grade NAT function in the AFTR. This reduces the amount of centralized state that must be held to a per- subscriber level. In order to delegate the NAPT function and make IPv4 Address sharing possible, port-restricted IPv4 addresses are allocated to the B4s.


Yong Cui (
Qiong (
Mohamed Boucadair (
Tina Tsou (
Yiu Lee (
Ian Farrer (

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