Analysis of Algorithms For Deriving Port Sets
draft-tsou-softwire-port-set-algorithms-analysis-04
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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
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
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Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on November 18, 2013.
Copyright Notice
Copyright (c) 2013 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
Tsou, et al. Expires November 18, 2013 [Page 1]
Internet-Draft Port Set Algorithm Analysis May 2013
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
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]
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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
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