IPv6 is Classless
draft-bourbaki-6man-classless-ipv6-00

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Last updated 2017-05-22
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Network Working Group                                            R. Bush
Internet-Draft                                 Internet Initiative Japan
Updates: 4291 (if approved)                                 B. Carpenter
Intended status: Standards Track                       Univ. of Auckland
Expires: November 23, 2017                                       F. Gont
                                                  SI6 Networks / UTN-FRH
                                                             N. Hilliard
                                                                    INEX
                                                               G. Huston
                                                                   APNIC
                                                               C. Morrow
                                                                    GOOG
                                                             J. Snijders
                                                                     NTT
                                                            May 22, 2017

                           IPv6 is Classless
                 draft-bourbaki-6man-classless-ipv6-00

Abstract

   Over the history of IPv6, various classful address models have been
   proposed, none of which has withstood the test of time.  The last
   remnant of IPv6 classful addressing is a rigid network interface
   identifier boundary at /64.  This document removes the fixed position
   of that boundary for interface addressing.

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 http://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 November 23, 2017.

Bush, et al.            Expires November 23, 2017               [Page 1]
Internet-Draft              IPv6 is Classless                   May 2017

Copyright Notice

   Copyright (c) 2017 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
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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   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.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Suggested Reading . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Identifier and Subnet Length Statements . . . . . . . . . . .   3
   4.  Recommendations . . . . . . . . . . . . . . . . . . . . . . .   4
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   5
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   Over the history of the IPv6 protocol, several classful addressing
   models have been proposed.  The most notable example recommended Top-
   Level Aggregation (TLA) and Next-Level Aggregation (NLA) Identifiers
   [RFC2450], but was obsoleted by [RFC3587], leaving a single remnant
   of classful addressing in IPv6: a rigid network interface identifier
   boundary at /64.  This document removes the fixed position of that
   boundary for interface addressing.

   Recent proposed changes to the IP Version 6 Addressing Architecture
   specification [RFC4291] have caused controversy.  While link prefixes
   of varied lengths, e.g.  /127, /126, /124, /120, ...  /64 have been
   successfully deployed for many years, glaring mismatches between a
   formal specification and long-standing field deployment practices are
   never wise, not least because of the strong risk of mis-
   implementation, which can easily result in serious operational
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