Lightweight 4over6: An Extension to the Dual-Stack Lite Architecture
RFC 7596, “Lightweight 4over6: An Extension to the Dual-Stack Lite Architecture”, is a Proposed Standard document published in July 2015 by Y. Cui, Q. Sun, M. Boucadair, T. Tsou, Y. Lee, I. Farrer. The canonical text is published by the RFC Editor.
Abstract
Dual-Stack Lite (DS-Lite) (RFC 6333) 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 and Port Translation (NAPT) function from the centralized DS-Lite tunnel concentrator to the tunnel client located in the Customer Premises Equipment (CPE). This removes the requirement for a Carrier Grade NAT function in the tunnel concentrator and 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 CPEs.
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
The canonical text of RFC 7596 is hosted at rfc-editor.org. Available in TXT,HTML.
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