draft-carpenter-obsolete-1888
Network Working Group
Internet Draft B. Carpenter
Document: draft-carpenter-obsolete-1888-01.txt IBM
Expires: March 2005
September 2004
RFC 1888 is obsolete
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Abstract
This document recommends that RFC 1888, on OSI NSAPs and IPv6, be
reclassified Historic as most of it has no further value, apart from
one section which is faulty.
Table of Contents
1. Introduction 2
2. Recommendation to reclassify RFC 1888 2
3. Security Considerations 2
4. IANA Considerations 3
5. Acknowledgements 3
6. Normative References 3
7. Author's Address 3
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1. Introduction
[RFC 1888] was published as an Experimental RFC in 1996, at an early
stage in the development of IPv6, when it appeared important to
consider usage of Open Systems Interconnection (OSI) addressing for
IPv6. In Sections 3 through 5, it defines mappings of certain OSI
Network Service Access Point (NSAP) addresses inside IPv6 addresses,
and how to carry arbitrary NSAP addresses as IPv6 destination
options. However, it also contains significant "health warnings"
about the difficulty of routing packets in the global Internet using
such addresses. As far as is known to the IETF, these address
mappings have never been seriously used and are not supported by IPv6
implementations. Furthermore, the deployment of OSI solutions is not
sufficiently widespread that any change in this situation can be
expected.
Additionally, Section 6 of [RFC 1888] specifies a mapping of IPv6
addresses inside OSI NSAP addresses. This mapping has recently
aroused some interest, for example to allow IP addresses to be
expressed in an Asynchronous Transfer Mode (ATM) context.
Unfortunately, Section 6 of [RFC 1888] contains two errors in its
usage of OSI Initial Domain Part (IDP) format:
* firstly by referring in the text to the Internet Code Point (ICP)
as a single octet, whereas it is correctly a 16-bit field;
* secondly by stating that "The first three octets are an IDP in
binary format", but [NSAP] states in section A.5.2.1 that "The
abstract syntax for the IDI is decimal digits" and specifies a
preferred binary encoding in section A.5.3 "using a semi-octet to
represent the value of each decimal digit ... , yielding a value in
the range 0000-1001".
2. Recommendation to reclassify RFC 1888
Due to the lack of use of one of the mappings, and the errors in the
documentation of the other one, this document recommends the IESG to
reclassify [RFC 1888] as Historic.
It is assumed that parties who wish to use a mapping of IPv6
addresses inside OSI NSAP addresses will correct, augment, and
resubmit Section 6 of [RFC 1888] as a separate document.
3. Security Considerations
This recommendation has no known impact on the security of the
Internet.
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4. IANA Considerations
IANA is requested to mark the IPv6 address prefix 0000 001, reserved
for NSAP Allocation in [RFC 3513], as simply Reserved.
IANA is requested to hold the registry for ICD codes implied by
Section 6 of [RFC 1888] in abeyance until a replacement for that
Section is approved for publication.
5. Acknowledgements
Scott Brim and Arun Pandey made useful comments on this document.
6. Normative References
[RFC 1888] J. Bound, B. Carpenter, D. Harrington, J. Houldsworth, A.
Lloyd, "OSI NSAPs and IPv6", RFC 1888, August 1996.
[RFC 3513] R. Hinden, S. Deering, "Internet Protocol Version 6 (IPv6)
Addressing Architecture", RFC 3513, April 2003.
[NSAP] International Organization for Standardization, "Information
technology -- Open Systems Interconnection -- Network service
definition", ISO/IEC 8348:2002, 2002.
7. Author's Address
Brian E. Carpenter
IBM Zurich Research Laboratory
Saeumerstrasse 4 / Postfach
8803 Rueschlikon
Switzerland
Email: brc@zurich.ibm.com
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RFC 1888 is obsolete September 2004
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