[Docs] [txt|pdf|xml|html] [Tracker] [Email] [Nits]

Versions: 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21

6MAN Working Group                                           A. Petrescu
Internet-Draft                                                 CEA, LIST
Intended status: Standards Track                      September 21, 2018
Expires: March 25, 2019


                The length of the IPv6 link-local prefix
                  draft-petrescu-6man-ll-prefix-len-00

Abstract

   The length of the IPv6 link-local prefix is 64 decimal.

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
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   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 March 25, 2019.

Copyright Notice

   Copyright (c) 2018 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
   (https://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
   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.







Petrescu                 Expires March 25, 2019                 [Page 1]


Internet-Draft                IPv6-LL-plen                September 2018


Table of Contents

   1.  Statement . . . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Security Considerations . . . . . . . . . . . . . . . . . . .   3
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   3
   5.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   3
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   3
   7.  Normative References  . . . . . . . . . . . . . . . . . . . .   3
   Appendix A.  ChangeLog  . . . . . . . . . . . . . . . . . . . . .   3
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   4

1.  Statement

   The length of the IPv6 link-local prefix is 64 decimal.

   The IPv6 link-local prefix is represented textually "fe80::/64".

   The illustration of the IPv6 link-local prefix is:


     |
     |    64 bits, the link-local prefix  |          64 bits           |
     +----------+-------------------------+----------------------------+
     |1111111010000000000000...00000000000|       interface ID         |
     +----------+-------------------------+----------------------------+


                   Figure 1: The IPv6 link-local prefix

2.  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

   prefix: a contiguous string of bits valid for forwarding operations
   and for subnet formation.

   textual representation of a prefix: e.g. fe80::/64.

   n leading bits: the first n bits in a string of bits read from left
   to right in a writing system that is read left-to-right.  E.g. the 10
   leading bits of the fe80::/64 textual representation of the IPv6
   link-local prefix are 1111111010.






Petrescu                 Expires March 25, 2019                 [Page 2]


Internet-Draft                IPv6-LL-plen                September 2018


3.  Security Considerations

   The clarification of the definition of the prefix length of the IPv6
   link-local prefix at IANA is: call it 'leading bits' and not
   'prefix', or state that the IPv6 prefix length of link-local
   addresses is 10 decimal.  This clarification has beneficial impact in
   the algorithm implementation for calculation of the opaque and stable
   Interface Identifiers for IPv6 link-local addresses.  It also
   positively impacts some implementations of IPv6 forwarding.

4.  IANA Considerations

   IANA is requested to change the name of the column head in the table
   that depicts the "Internet Protocol Version 6 Address Space".  The
   name should be "The n leading bits of an address" instead of "IPv6
   Prefix".

   The desired effect of this change is that the IPv6 link-local prefix
   be "fe80::/64" and that the 10 leading bits of this prefix be
   1111111010.  A second effect is that the textual representation
   "fe80::/10" as an IPv6 link-local prefix should disappear from that
   IANA page, because it is wrong.

5.  Contributors

   Listed from 6man WG discussion.

6.  Acknowledgements

   Listed from 6man WG discussion.

7.  Normative References

   [RFC1042]  Postel, J. and J. Reynolds, "Standard for the transmission
              of IP datagrams over IEEE 802 networks", STD 43, RFC 1042,
              DOI 10.17487/RFC1042, February 1988,
              <https://www.rfc-editor.org/info/rfc1042>.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <https://www.rfc-editor.org/info/rfc2119>.

Appendix A.  ChangeLog

   The changes are listed in reverse chronological order, most recent
   changes appearing at the top of the list.




Petrescu                 Expires March 25, 2019                 [Page 3]


Internet-Draft                IPv6-LL-plen                September 2018


Author's Address

   Alexandre Petrescu
   CEA, LIST
   CEA Saclay
   Gif-sur-Yvette , Ile-de-France   91190
   France

   Phone: +33169089223
   Email: Alexandre.Petrescu@cea.fr









































Petrescu                 Expires March 25, 2019                 [Page 4]


Html markup produced by rfcmarkup 1.129c, available from https://tools.ietf.org/tools/rfcmarkup/