Sign in
Version 5.13.0, 2015-03-25
Report a bug

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

Document type: Replaced Internet-Draft (softwire WG)
Document stream: IETF
Last updated: 2013-04-16 (latest revision 2013-02-25)
Intended RFC status: Unknown
Other versions: (expired, archived): plain text, pdf, html

IETF State: Adopted by a WG
Document shepherd: No shepherd assigned

IESG State: Replaced by draft-ietf-softwire-lw4over6
Responsible AD: (None)
Send notices to: No addresses provided

This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found here:


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)