6RENUM B. E. Carpenter
Internet-Draft Univ. of Auckland
Intended status: Informational S. Jiang
Expires: May 13, 2013 Huawei Technologies Co., Ltd
November 09, 2012

Next Steps for Renumbering IPv6 Sites
draft-carpenter-6renum-next-steps-00

Abstract

This document summarises for the record the next steps proposed following the completion of chartered work in the 6RENUM WG. It is not expected to become an RFC.

Status of This Memo

This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79.

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This Internet-Draft will expire on May 13, 2013.

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Table of Contents

1. Introduction

The IPv6 Site Renumbering (6RENUM) working group completed its chartered set of documents by November 2012. The present document summarises for the record the next steps proposed and discussed in the final WG meeting. It is posted as a draft for convenience but is not expected to become an RFC.

The next steps are divided into two categories, after analysis of the gap analysis documents in particular [I-D.ietf-6renum-gap-analysis], [I-D.ietf-6renum-static-problem]. Firstly, there are items that have been identified as needed for site renumbering but are either not widely implemented or not widely used. These items need to be documented in the form of advice to the community, but do not appear to require specification work in the IETF. Secondly, there are items that may be useful for site renumbering, and which need specification work of some kind. The two following sections address these two areas.

2. Advice to the community

The following items could form part of one or more informational (or possibly BCP) documents.

  1. The long-standing advice that names, rather than numeric addresses, should be used whenever possible is reiterated. In general that means DNS names, but in some circumstances it might mean some other form of parametric name. A specific case is that IPsec security associations should use names, as allowed since [RFC2407], whenever possible.
  2. Some form of name-based service discovery should be used wherever possible, rather than configuring service addresses. This could be DNS-based, mDNS-based or even SLP.
  3. Addresses used for internal traffic could be stabilised by deploying a ULA prefix (as well as a globally routed prefix).
  4. Sites should use some sort of configuration management tool. This could be described as an IP address management (IPAM) tool, an asset management tool, or more generally as an operational support system (OSS). Its role is to populate DNS, reverse DNS, DHCPv6, and router configurations. The tool should use DNS names or parametric names in configuration files. See [I-D.baker-6renum-oss-renumbering].
  5. Include servers in DHCPv6 to avoid manual configuration.
  6. Use Secure Dynamic DNS Update [RFC3007] where appropriate (requires key management in the management tool).
  7. Plan a renumbering procedure as part of the IPv6 network design. Handy references include [RFC4192], [RFC5887], [I-D.ietf-6renum-enterprise], [I-D.ietf-6renum-gap-analysis], [I-D.ietf-6renum-static-problem].
  8. Avoid software license systems that rely on IP addresses.

Finally, it is noted that the management tool mentioned above might be able to take advantage of certain features that are defined but apparently not widely used. In particular, these are DHCPv6 RECONFIGURE/RENEW [RFC3315], DHCPv6-PD [RFC3633] and ICMPv6 router renumbering [RFC2894]. There is an open question whether the latter is in fact usable.

3. IETF work items

These are the items identified in the 6RENUM gap analysis that appear to need work in the appropriate IETF WGs.

  1. Reconcile use of DHCPv6 and RA in an enterprise network.
  2. Bulk DHVPv6 RECONFIGURE mechanism.
  3. Clarify how a MIPv6 host rebinds with its home agent if the latter is renumbered while mobile is disconnected.
  4. Review ICMPv6 router renumbering [RFC2894] to see if it needs updating and if it is viable as a solution.

4. Security Considerations

This document defines no protocol, so does not introduce any new security exposures.

5. IANA Considerations

This document requests no action by IANA.

6. Acknowledgements

This document was produced using the xml2rfc tool [RFC2629].

Brian Carpenter was a visitor at the Computer Laboratory, Cambridge University during this work.

7. Change log [RFC Editor: Please remove]

draft-carpenter-6renum-next-steps-00: original version, 2012-11-09.

8. Informative References

[RFC2407] Piper, D., "The Internet IP Security Domain of Interpretation for ISAKMP", RFC 2407, November 1998.
[RFC2629] Rose, M.T., "Writing I-Ds and RFCs using XML", RFC 2629, June 1999.
[RFC4192] Baker, F., Lear, E. and R. Droms, "Procedures for Renumbering an IPv6 Network without a Flag Day", RFC 4192, September 2005.
[RFC3007] Wellington, B., "Secure Domain Name System (DNS) Dynamic Update", RFC 3007, November 2000.
[RFC5887] Carpenter, B., Atkinson, R. and H. Flinck, "Renumbering Still Needs Work", RFC 5887, May 2010.
[RFC3315] Droms, R., Bound, J., Volz, B., Lemon, T., Perkins, C. and M. Carney, "Dynamic Host Configuration Protocol for IPv6 (DHCPv6)", RFC 3315, July 2003.
[RFC3633] Troan, O. and R. Droms, "IPv6 Prefix Options for Dynamic Host Configuration Protocol (DHCP) version 6", RFC 3633, December 2003.
[RFC2894] Crawford, M., "Router Renumbering for IPv6", RFC 2894, August 2000.
[I-D.ietf-6renum-enterprise] Jiang, S, Liu, B and B Carpenter, "IPv6 Enterprise Network Renumbering Scenarios and Guidelines", Internet-Draft draft-ietf-6renum-enterprise-01, July 2012.
[I-D.ietf-6renum-gap-analysis] Liu, B, Jiang, S, Carpenter, B and S Venaas, "IPv6 Site Renumbering Gap Analysis", Internet-Draft draft-ietf-6renum-gap-analysis-03, September 2012.
[I-D.ietf-6renum-static-problem] Carpenter, B and S Jiang, "Problem Statement for Renumbering IPv6 Hosts with Static Addresses", Internet-Draft draft-ietf-6renum-static-problem-00, July 2012.
[I-D.baker-6renum-oss-renumbering] Baker, F, "Renumbering using an Operational Support System", Internet-Draft draft-baker-6renum-oss-renumbering-00, November 2012.
[I-D.liu-6renum-dhcpv6-slaac-switching] Liu, B, Wang, W and X Gong, "DHCPv6/SLAAC Address Configuration Switching for Host Renumbering", Internet-Draft draft-liu-6renum-dhcpv6-slaac-switching-01, July 2012.

Authors' Addresses

Brian Carpenter Department of Computer Science University of Auckland PB 92019 Auckland, 1142 New Zealand EMail: brian.e.carpenter@gmail.com
Sheng Jiang Huawei Technologies Co., Ltd Q14, Huawei Campus No.156 Beiqing Road Hai-Dian District, Beijing, 100095 P.R. China EMail: jiangsheng@huawei.com