Technical Summary
Global IPv6 deployment was slower than originally expected. As IPv4
address exhaustion approaches, the IPv4 to IPv6 transition issues
become more critical and less tractable. Host-based transition
mechanisms used in dual stack environments are not able to meet the
transition requirements. Most end users are not sufficiently expert
to configure or maintain host-based transition mechanisms. Carrier-
Grade NAT (CGN) devices with integrated transition mechanisms can
reduce the operational change required during the IPv4 to IPv6
migration or coexistence period.
This document proposes an incremental CGN approach for IPv6
transition. It can provide IPv6 access services for IPv6-enabled
hosts and IPv4 access services for IPv4 hosts while leaving much of a
legacy IPv4 ISP network unchanged. It is suitable for the initial
stage of IPv4 to IPv6 migration. Unlike NAT444 based CGN alone,
Incremental CGN also supports and encourages transition towards dual-
stack or IPv6-only ISP networks. A smooth transition to IPv6
deployment is also described in this document.
An integrated configurable CGN device and an adaptive Home Gateway
(HG) device are introduced. Both HG and CGN are re-usable devices
during different transition periods. It avoids potential multiple
upgrades. It enables IPv6 migration to be incrementally achieved
according to the real user requirements.
Working Group Summary
draft-ietf-v6ops-incremental-cgn-00, was accepted as v6ops WG
document, 2009-11-17. Working Group Last Call completed on v6ops
10/27/10. draft 02 was was released to address grammar issues and
idnits in document shepherd review.
Document Quality
Cross-area review from participants on the internet and transport
areas has been a solicited and provided in the course of document
socialization. Solicitation of directed reviews (particularly from
OPS directorate) should probably be part of the post-last-call
process.
Personel
Fred Baker is shepherd.