Internet DRAFT - draft-despres-softwire-stateless-analysis-tool
draft-despres-softwire-stateless-analysis-tool
Internet Engineering Task Force R. Despres
Internet-Draft RD-IPtech
Intended status: Informational July 16, 2012
Expires: January 17, 2013
Feature Analysis Tool for stateless IPv4/IPv6 (MAP-T, MAP-E, 4rd)
draft-despres-softwire-stateless-analysis-tool-02
Abstract
This document proposes a discussion tool for the Softwire meeting at
IETF 84 in Vancouver.
Significant differentiating features between the MAP approach
(proposed standards MAP-T and MAP-E) and the unified approach
(proposed standard 4rd) are presented in tabular format.
Its purpose is to facilitate decision making, and is therefore
temporary.
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
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material or to cite them other than as "work in progress."
This Internet-Draft will expire on January 17, 2013.
Copyright Notice
Copyright (c) 2012 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
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publication of this document. Please review these documents
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to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
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described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Feature-Comparison Tables . . . . . . . . . . . . . . . . . . . 4
3. Informative References . . . . . . . . . . . . . . . . . . . . 5
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 5
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1. Introduction
Stateless solutions that are proposed for residual IPv4 service
across IPv6-only networks will be discussed at IETF 84 in Vancouver,
July 27 to August 3 2012. This document proposes a tool to
facilitate common understanding during these discussions, and thus
facilitate decision making on what to standardize and why.
It contains tables in which, for each of the major proposed
specifications, MAP-T, MAP-E and 4rd, the most significant
differentiating features are listed:
o Table 1 deals with features that depend on whether IPv4 packets
are twice translated (MAP-T), tunneled with packet encapsulation
(MAP-E), or tunneled with reversible IPv4/IPv6 header translation
(4rd).
o Table 2 deals with features that depend on how IPv6 addresses are
derived from IPv4 addresses, plus ports if applicable. Table 3
deals with miscellaneous features.
Documents used are:
o [I-D.ietf-softwire-map] for MAP-T and MAP-E
o [I-D.ietf-softwire-4rd] for 4rd
Issues identified on the tracker of trac.tools.ietf.org/wg/softwire/
trac/report/1 are referenced by their ticket numbers.
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2. Feature-Comparison Tables
+----+------------------------------+-------+-------+-----+---------+
| | Features that depend on | MAP-T | MAP-E | 4rd | Issue # |
| | header formats | | | | in |
| | | | | | tracker |
+----+------------------------------+-------+-------+-----+---------+
| H1 | IPv6-only ACLs applicable to | Y | N | Y | |
| | IPv4 packets | | | | |
| H2 | Support of DF=1 fragmented | N | Y | Y | #8 |
| | packets (required by | | | | |
| | RFC4821) | | | | |
| H3 | Max performance where | Y | N | Y | #9 |
| | TCP/IPv6 is faster than | | | | |
| | TCP/IPv4/IPv6 | | | | |
| H4 | For shared-address CEs, | N | Y | Y | |
| | support of DCCP, UDP lite, | | | | |
| | and any future protocols | | | | |
| | using port fields and | | | | |
| | checksum algorithm of TCP | | | | |
| H5 | IPv6 congestion | Y | N | Y | |
| | notifications of RFC 3168 | | | | |
| | forwarded in IPv4 | | | | |
| H6 | Null-checksum UDP datagrams | N | Y | Y | #6 |
| | cannot be sent to wrong | | | | |
| | destinations with valid | | | | |
| | checksums | | | | |
+----+------------------------------+-------+-------+-----+---------+
Table 1
+----+-------------------------------------+--------+-----+---------+
| | Features that depend on IPv6 | MAP-T | 4rd | Issue # |
| | address formats | and | | in |
| | | MAP-E | | tracker |
+----+-------------------------------------+--------+-----+---------+
| A1 | Applicability to sites that use | N | Y | #5 |
| | subnet ID = 0 | | | |
| A2 | Applicability to CEs that are | N | Y | |
| | behind third-party CPEs | | | |
| A3 | IPv6 addresses of IPv4 endpoints | N | Y | |
| | are recognizable without knowledge | | | |
| | of Domain mapping rules (for ACLs | | | |
| | etc.) | | | |
+----+-------------------------------------+--------+-----+---------+
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Table 2
+----+----------------------------------+-----+-----+-----+---------+
| | Miscellaneous | MAP | MAP | 4rd | Issue # |
| | | -T | -E | | in |
| | | | | | tracker |
+----+----------------------------------+-----+-----+-----+---------+
| M1 | IPv6 Packet reassembly never | Y | N | Y | #3 |
| | needed in BRs | | | | |
| M3 | BR-CE compatibility guaranteed | N | N | Y | |
| | by the number of mapping rules | | | | |
| | CEs MUST be able to support | | | | |
| M4 | IP header length | 40 | 60 | 40 | |
| | | or | or | or | |
| | | 48 | 68 | 48 | |
+----+----------------------------------+-----+-----+-----+---------+
Table 3
3. Informative References
[I-D.ietf-softwire-4rd]
Despres, R., Penno, R., Lee, Y., Chen, G., S. Jiang, and
M. Chen "IPv4 Residual Deployment via IPv6 - a unified
Stateless Solution (4rd)", draft-ietf-softwire-4rd-03
(work in progress), July 2012.
[I-D.ietf-softwire-map]
Troan, O., Dec, W., Li, X., Bao, C., Zhai, Y., Matsushima,
S., and T. Murakami, "Mapping of Address and Port (MAP)",
draft-ietf-softwire-map-01 (work in progress), June 2012.
Author's Address
Remi Despres
RD-IPtech
3 rue du President Wilson
Levallois,
France
Email: despres.remi@laposte.net
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