Lightweight 4over6: An Extension to the DS-Lite Architecture
draft-ietf-softwire-lw4over6-00
Softwire Working Group Y. Cui
Internet-Draft Tsinghua University
Intended status: Standards Track Q. Sun
Expires: October 12, 2013 China Telecom
M. Boucadair
France Telecom
T. Tsou
Huawei Technologies
Y. Lee
Comcast
I. Farrer
Deutsche Telekom AG
April 10, 2013
Lightweight 4over6: An Extension to the DS-Lite Architecture
draft-ietf-softwire-lw4over6-00
Abstract
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.
Status of this Memo
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provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on October 12, 2013.
Copyright Notice
Cui, et al. Expires October 12, 2013 [Page 1]
Internet-Draft B4-translated DS-Lite April 2013
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Conventions . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4
4. Lightweight 4over6 Architecture . . . . . . . . . . . . . . . 5
5. Lightweight B4 Behavior . . . . . . . . . . . . . . . . . . . 7
5.1. Lightweight B4 Provisioning . . . . . . . . . . . . . . . 7
5.2. Lightweight B4 Data Plane Behavior . . . . . . . . . . . . 8
6. Lightweight AFTR Behavior . . . . . . . . . . . . . . . . . . 9
6.1. Binding Table Maintenance . . . . . . . . . . . . . . . . 9
6.2. lwAFTR Data Plane Behavior . . . . . . . . . . . . . . . . 10
7. Provisioning of IPv4 address and Port Set . . . . . . . . . . 11
8. ICMP Processing . . . . . . . . . . . . . . . . . . . . . . . 12
9. Security Considerations . . . . . . . . . . . . . . . . . . . 13
10. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 13
11. Author List . . . . . . . . . . . . . . . . . . . . . . . . . 13
12. Acknowledgement . . . . . . . . . . . . . . . . . . . . . . . 16
13. References . . . . . . . . . . . . . . . . . . . . . . . . . . 16
13.1. Normative References . . . . . . . . . . . . . . . . . . . 16
13.2. Informative References . . . . . . . . . . . . . . . . . . 17
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 18
Cui, et al. Expires October 12, 2013 [Page 2]
Internet-Draft B4-translated DS-Lite April 2013
1. Introduction
Dual-Stack Lite (DS-Lite, [RFC6333]) defines a model for providing
IPv4 access over an IPv6 network using two well-known technologies:
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