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drop 2119 language

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draft-nbourbaki-6man-classless-ipv6.txt
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Network Working Group N. Bourbaki
Internet-Draft The Intertubes
Intended status: Standards Track May 8, 2017
Expires: November 9, 2017
Intended status: Standards Track May 9, 2017
Expires: November 10, 2017
IPv6 is Classless
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document removes that boundary as far as routing and addressing are
concerned.
Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" are to
be interpreted as described in RFC 2119 [RFC2119] only when they
appear in all upper case. They may also appear in lower or mixed
case as English words, without normative meaning.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
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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 9, 2017.
This Internet-Draft will expire on November 10, 2017.
Copyright Notice
Copyright (c) 2017 IETF Trust and the persons identified as the
document authors. All rights reserved.
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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
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carefully, as they describe your rights and restrictions with respect
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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the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
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10. References . . . . . . . . . . . . . . . . . . . . . . . . . 4
10.1. Normative References . . . . . . . . . . . . . . . . . . 4
10.2. Informative References . . . . . . . . . . . . . . . . . 5
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 6
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 5
1. Introduction
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It is also assumed that the reader understands IPv6 [RFC2460], the IP
Version 6 Addressing Architecture [RFC4291], the proposed changes to
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RFC4291 [I-D.hinden-6man-rfc4291bis], and the recent recommendations
for the generation of stable Interface Identifiers [RFC8064].
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[RFC8064]. Therefore their length, previously fixed at 64 bits
[RFC7136], is in fact a free parameter as stated in [RFC4862].
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3. Background
Some confusion has been caused by the IP Version 6 Addressing
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5. Recommendations
For historical reasons, when a prefix is needed on a link, barring
other considerations, a /64 is RECOMMENDED [RFC7136].
other considerations, a /64 is recommended [RFC7136].
The length of the Interface Identifier in Stateless Address
AutoConfiguration [RFC4862] is a parameter; its length SHOULD be
sufficient for effective randomization for privacy reasons. For
example, a /48 might be sufficient. But operationally we RECOMMEND,
example, a /48 might be sufficient. But operationally we recommend,
barring strong considerations to the contrary, using 64-bits for
SLAAC in order not to discover bugs where 64 was hard-coded, and to
favor portability of devices and operating systems.
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None the less, there is no reason in theory why an IPv6 node should
not operate with different interface identfier lengths on different
physical interfaces. Thus a correct implementation of SLAAC must in
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fact allow for any prefix length, with the value being a parameter
per interface. For instance, the Interface Identifier length in the
recommended (see [RFC8064]) algorithm for selecting stable interface
identifiers [RFC7217] is a parameter, rather than a hardcoded value.
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6. Security Considerations
Assumming that nodes employ unpredictable interface identifiers
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10.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC2450] Hinden, R., "Proposed TLA and NLA Assignment Rules",
RFC 2450, December 1998.
[RFC2460] Deering, S. and R. Hinden, "Internet Protocol, Version 6
(IPv6) Specification", RFC 2460, December 1998.
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[RFC4291] Hinden, R. and S. Deering, "IP Version 6 Addressing
Architecture", RFC 4291, February 2006.
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DOI 10.17487/RFC7217, April 2014,
<http://www.rfc-editor.org/info/rfc7217>.
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[RFC8064] Gont, F., Cooper, A., Thaler, D., and W. Liu,
"Recommendation on Stable IPv6 Interface Identifiers",
RFC 8064, DOI 10.17487/RFC8064, February 2017,
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RFC 7721, DOI 10.17487/RFC7721, March 2016,
<http://www.rfc-editor.org/info/rfc7721>.
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Author's Address
Nicolas Bourbaki
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