Softwire Problem Statement
RFC 4925
Network Working Group X. Li, Ed.
Request for Comments: 4925 CERNET
Category: Informational S. Dawkins, Ed.
Huawei
D. Ward, Ed.
Cisco Systems
A. Durand, Ed.
Comcast
July 2007
Softwire Problem Statement
Status of This Memo
This memo provides information for the Internet community. It does
not specify an Internet standard of any kind. Distribution of this
memo is unlimited.
Copyright Notice
Copyright (C) The IETF Trust (2007).
Abstract
This document captures the problem statement for the Softwires
Working Group, which is developing standards for the discovery,
control, and encapsulation methods for connecting IPv4 networks
across IPv6-only networks as well as IPv6 networks across IPv4-only
networks. The standards will encourage multiple, inter-operable
vendor implementations by identifying, and extending where necessary,
existing standard protocols to resolve a selected set of "IPv4/IPv6"
and "IPv6/IPv4" transition problems. This document describes the
specific problems ("Hubs and Spokes" and "Mesh") that will be solved
by the standards developed by the Softwires Working Group. Some
requirements (and non-requirements) are also identified to better
describe the specific problem scope.
Li, et al. Informational [Page 1]
RFC 4925 Softwire Problem Statement July 2007
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 4
2. Hubs and Spokes Problem . . . . . . . . . . . . . . . . . . . 6
2.1. Description . . . . . . . . . . . . . . . . . . . . . . . 8
2.2. Non-Upgradable CPE Router . . . . . . . . . . . . . . . . 9
2.3. Network Address Translation (NAT) and Port Address
Translation (PAT) . . . . . . . . . . . . . . . . . . . . 10
2.4. Static Prefix Delegation . . . . . . . . . . . . . . . . . 10
2.5. Softwire Initiator . . . . . . . . . . . . . . . . . . . . 11
2.6. Softwire Concentrator . . . . . . . . . . . . . . . . . . 11
2.7. Softwire Concentrator Discovery . . . . . . . . . . . . . 12
2.8. Scaling . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.9. Routing . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.10. Multicast . . . . . . . . . . . . . . . . . . . . . . . . 12
2.11. Security . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.11.1. Authentication, Authorization, and Accounting
(AAA) . . . . . . . . . . . . . . . . . . . . . . . . 12
2.11.2. Privacy, Integrity, and Replay Protection . . . . . . 13
2.12. Operations and Management (OAM) . . . . . . . . . . . . . 13
2.13. Encapsulations . . . . . . . . . . . . . . . . . . . . . . 13
3. Mesh Problem . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.1. Description . . . . . . . . . . . . . . . . . . . . . . . 14
3.2. Scaling . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.3. Persistence, Discovery, and Setup Time . . . . . . . . . . 16
3.4. Multicast . . . . . . . . . . . . . . . . . . . . . . . . 17
3.5. Softwire Encapsulation . . . . . . . . . . . . . . . . . . 17
3.6. Security . . . . . . . . . . . . . . . . . . . . . . . . . 17
4. Security Considerations . . . . . . . . . . . . . . . . . . . 18
5. Principal Authors . . . . . . . . . . . . . . . . . . . . . . 18
6. Contributors . . . . . . . . . . . . . . . . . . . . . . . . . 19
7. References . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7.1. Normative References . . . . . . . . . . . . . . . . . . . 20
7.2. Informative References . . . . . . . . . . . . . . . . . . 20
Li, et al. Informational [Page 2]
RFC 4925 Softwire Problem Statement July 2007
1. Introduction
The Softwires Working Group is specifying the standardization of
discovery, control, and encapsulation methods for connecting IPv4
networks across IPv6-only networks and IPv6 networks across IPv4-only
networks in a way that will encourage multiple, inter-operable vendor
implementations. This document describes the specific problems
("Hubs and Spokes" and "Mesh") that will be solved by the standards
developed by the Softwires Working Group. Some requirements (and
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