Analysis of Algorithms For Deriving Port Sets
draft-tsou-softwire-port-set-algorithms-analysis-04
Internet Engineering Task Force T. Tsou, Ed.
Internet-Draft Huawei Technologies (USA)
Intended status: Informational T. Murakami
Expires: November 18, 2013 IP Infusion
S. Perreault
Viagenie
May 17, 2013
Analysis of Algorithms For Deriving Port Sets
draft-tsou-softwire-port-set-algorithms-analysis-04
Abstract
This memo analyzes some port set definition algorithms used for
stateless IPv4 to IPv6 transition technologies. The transition
technologies using port set algorithms can be divided into two
categories: fully stateless approach and binding approach. Some
algorithms can work for both approaches.
Status of this Memo
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This Internet-Draft will expire on November 18, 2013.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Various Types of Algorithms . . . . . . . . . . . . . . . . . 4
3.1. Binding Approach Algorithms . . . . . . . . . . . . . . . 4
3.1.1. Mask/Value Algorithm . . . . . . . . . . . . . . . . . 4
3.1.2. Cryptographic Algorithm . . . . . . . . . . . . . . . 7
3.2. Fully Stateless: the Generalized Modulus Algorithm
(GMA) . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2.1. MAP-E . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2.2. 4rd-U . . . . . . . . . . . . . . . . . . . . . . . . 10
3.2.3. MAP-T . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2.4. Evaluation . . . . . . . . . . . . . . . . . . . . . . 11
4. Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 13
6. Security Considerations . . . . . . . . . . . . . . . . . . . 13
7. References . . . . . . . . . . . . . . . . . . . . . . . . . . 13
7.1. Normative References . . . . . . . . . . . . . . . . . . . 13
7.2. Informative References . . . . . . . . . . . . . . . . . . 13
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 14
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1. Introduction
IPv6 transition technologies with address sharing can be divided into
three categories as suggested in [I-D.softwire-unified-cpe]:
o Fully stateful approach, e.g. [RFC6333]. Stateful solutions do
not make use of port sets, and are out of scope for this memo.
o Binding approach, with per-subscriber state, e.g.,
[I-D.softwire-lw4over6]. This type of algorithm does not embed
port set information and IPv4 address in the IPv6 address when
doing translation or encapsulation, so a mapping entry is required
in the border router. This type of solution gives flexibility in
address planning because the IPv4 address is not statically bound
to the IPv6 address. To some extent, the binding approach can
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