The length of the prefix of an IPv6 link-local address ranges from 10 to 127
draft-petrescu-6man-ll-prefix-len-21

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Last updated 2019-06-06
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6MAN Working Group                                           A. Petrescu
Internet-Draft                                                 CEA, LIST
Updates: RFC4291, RFC4007 (if approved)                    L. Velvindron
Intended status: Standards Track                           Cyberstorm.mu
Expires: December 8, 2019                                  N. Kottapalli
                                                           Benu Networks
                                                               G. Mishra
                                        Verizon Communications Inc. (VZ)
                                                               D. Mudric
                                                                   Avaya
                                                            June 6, 2019

The length of the prefix of an IPv6 link-local address ranges from 10 to
                                  127
                  draft-petrescu-6man-ll-prefix-len-21

Abstract

   A rejected Erratum to RFC4291 "IPv6 Addr Archi" on the topic of link-
   local addresses 'would need' a draft.  This draft is an answer to
   that need.

   The length of the prefix of an IPv6 link-local address is variable.
   The minimal value is 10 decimal.  The maximum value is 127 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
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   This Internet-Draft will expire on December 8, 2019.

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Petrescu, et al.        Expires December 8, 2019                [Page 1]
Internet-Draft                IPv6-LL-plen                     June 2019

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Table of Contents

   1.  Definitions and Statements  . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Justification . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Problem Statement . . . . . . . . . . . . . . . . . . . . . .   4
   5.  Kinds of Solutions  . . . . . . . . . . . . . . . . . . . . .   5
   6.  Context of Documents  . . . . . . . . . . . . . . . . . . . .   6
   7.  Context of OS Behaviour . . . . . . . . . . . . . . . . . . .   8
   8.  Historical Note . . . . . . . . . . . . . . . . . . . . . . .   9
   9.  Example of use of LL Prefix Length 32 . . . . . . . . . . . .   9
   10. Use-Cases . . . . . . . . . . . . . . . . . . . . . . . . . .  10
     10.1.  Use-Case Convoy  . . . . . . . . . . . . . . . . . . . .  10
     10.2.  Intuitive Next-Hop . . . . . . . . . . . . . . . . . . .  12
   11. Security Considerations . . . . . . . . . . . . . . . . . . .  12
   12. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
   13. Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  13
   14. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  13
   15. Normative References  . . . . . . . . . . . . . . . . . . . .  13
   Appendix A.  ChangeLog  . . . . . . . . . . . . . . . . . . . . .  13
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  15

1.  Definitions and Statements

   The prefix of an IP address is formed by the n leftmost bits of the
   address.  (in a left-to-right writing system).

   The prefix of an IP address is used for goals such as: identify the
   type of an IPv6 address (link-local, global, others), identify the
   belonging of an IP address to a particular subnetwork, assist the
   forwarding (or not forwarding) decisions, and others.

   The minimal length of the prefix of an IPv6 link-local address (the
   value of n) is equal to 10 decimal.  The maximum is 127.

   The prefix of an IPv6 link-local address is represented textually as
   "fe80::/n", where n MAY be any value between 10 and 127.

Petrescu, et al.        Expires December 8, 2019                [Page 2]
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