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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Tsou, et al. Expires November 18, 2013 [Page 1]Internet-Draft Port Set Algorithm Analysis May 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
Tsou, et al. Expires November 18, 2013 [Page 2]Internet-Draft Port Set Algorithm Analysis May 20131. 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
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