NAT offload extension to Dual-Stack lite

Document Type Expired Internet-Draft (individual)
Last updated 2012-05-03 (latest revision 2011-10-31)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


Dual-Stack Lite, combining IPv4-in-IPv6 tunnel and Carrier Grade NAT technologies, provides an approach that offers IPv4 service via IPv6 network by sharing IPv4 addresses among customers during IPv6 transition period. Dual-stack lite, however, requires CGN to maintain active NAT sessions, which means processing performance, memory size and log abilities for NAT sessions should scale with number of sessions of subscribers; Hence increasing in CAPEX for operators would be resulted in when traffic increase. This document propose the NAT offload extensions to DS-Lite, which allows offloading NAT translation function from centralized network side (AFTR) to distributed customer equipments (B4), thereby offering a trade-off between CAPEX (e.g. less performance requirements on AFTR device) and OPEX (e.g., easy and fast deployment of Dual-Stack Lite) for operators. The ability of easily co-deploying with basic Dual- Stack Lite is essential to NAT offload extension to DS-Lite.


Cathy Zhou (
Mohamed Boucadair (
Xiaohong Deng (

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