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Renumbering Still Needs Work
RFC 5887

Internet Engineering Task Force (IETF)                      B. Carpenter
Request for Comments: 5887                             Univ. of Auckland
Category: Informational                                      R. Atkinson
ISSN: 2070-1721                                         Extreme Networks
                                                               H. Flinck
                                                  Nokia Siemens Networks
                                                                May 2010

                      Renumbering Still Needs Work

Abstract

   This document reviews the existing mechanisms for site renumbering
   for both IPv4 and IPv6, and it identifies operational issues with
   those mechanisms.  It also summarises current technical proposals for
   additional mechanisms.  Finally, there is a gap analysis identifying
   possible areas for future work.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc5887.

Copyright Notice

   Copyright (c) 2010 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
   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.

Carpenter, et al.             Informational                     [Page 1]
RFC 5887              Renumbering Still Needs Work              May 2010

Table of Contents

   1. Introduction ....................................................3
   2. Existing Host-Related Mechanisms ................................5
      2.1. DHCP .......................................................5
      2.2. IPv6 Stateless Address Autoconfiguration ...................6
      2.3. IPv6 ND Router/Prefix Advertisements .......................7
      2.4. PPP ........................................................7
      2.5. DNS Configuration ..........................................8
      2.6. Dynamic Service Discovery ..................................9
   3. Existing Router-Related Mechanisms ..............................9
      3.1. Router Renumbering .........................................9
   4. Existing Multi-Addressing Mechanism for IPv6 ...................10
   5. Operational Issues with Renumbering Today ......................11
      5.1. Host-Related Issues .......................................11
           5.1.1. Network-Layer Issues ...............................11
           5.1.2. Transport-Layer Issues .............................13
           5.1.3. DNS Issues .........................................14
           5.1.4. Application-Layer Issues ...........................14
      5.2. Router-Related Issues .....................................16
      5.3. Other Issues ..............................................17
           5.3.1. NAT State Issues ...................................17
           5.3.2. Mobility Issues ....................................18
           5.3.3. Multicast Issues ...................................18
           5.3.4. Management Issues ..................................19
           5.3.5. Security Issues ....................................21
   6. Proposed Mechanisms ............................................22
      6.1. SHIM6 .....................................................22
      6.2. MANET Proposals ...........................................22
      6.3. Other IETF Work ...........................................23
      6.4. Other Proposals ...........................................23
   7. Gaps ...........................................................24
      7.1. Host-Related Gaps .........................................24
      7.2. Router-Related Gaps .......................................25
      7.3. Operational Gaps ..........................................25

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