6RENUM B. Carpenter Internet-Draft Univ. of Auckland Intended status: Informational S. Jiang Expires: May 13, 2013 Huawei Technologies Co., Ltd November 9, 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. 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 May 13, 2013. Copyright Notice Copyright (c) 2012 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 & Jiang Expires May 13, 2013 [Page 1] Internet-Draft Next steps for 6renum November 2012 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Advice to the community . . . . . . . . . . . . . . . . . . . . 3 3. IETF work items . . . . . . . . . . . . . . . . . . . . . . . . 4 4. Security Considerations . . . . . . . . . . . . . . . . . . . . 4 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 4 6. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 5 7. Change log [RFC Editor: Please remove] . . . . . . . . . . . . 5 8. Informative References . . . . . . . . . . . . . . . . . . . . 5 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 6 Carpenter & Jiang Expires May 13, 2013 [Page 2] Internet-Draft Next steps for 6renum November 2012 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). Carpenter & Jiang Expires May 13, 2013 [Page 3] Internet-Draft Next steps for 6renum November 2012 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. * The DHCPv6 and ND state machines inside a host influence each other. * What should a DHCPv6-configured host do when it receives RA messages containing a new prefix? Current implementations just configure the new prefix. Is this OK? * What should a SLAAC-configured host do when it receives RA messages with "M" set? * See analysis in [I-D.liu-6renum-dhcpv6-slaac-switching]. 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. Carpenter & Jiang Expires May 13, 2013 [Page 4] Internet-Draft Next steps for 6renum November 2012 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 [I-D.baker-6renum-oss-renumbering] Baker, F., "Renumbering using an Operational Support System", draft-baker-6renum-oss-renumbering-00 (work in progress), November 2012. [I-D.ietf-6renum-enterprise] Jiang, S., Liu, B., and B. Carpenter, "IPv6 Enterprise Network Renumbering Scenarios and Guidelines", draft-ietf-6renum-enterprise-03 (work in progress), October 2012. [I-D.ietf-6renum-gap-analysis] Liu, B., Jiang, S., Carpenter, B., and S. Venaas, "IPv6 Site Renumbering Gap Analysis", draft-ietf-6renum-gap-analysis-04 (work in progress), October 2012. [I-D.ietf-6renum-static-problem] Carpenter, B. and S. Jiang, "Problem Statement for Renumbering IPv6 Hosts with Static Addresses", draft-ietf-6renum-static-problem-02 (work in progress), September 2012. [I-D.liu-6renum-dhcpv6-slaac-switching] Liu, B., Wang, W., and X. Gong, "DHCPv6/SLAAC Address Configuration Switching for Host Renumbering", draft-liu-6renum-dhcpv6-slaac-switching-01 (work in progress), July 2012. [RFC2407] Piper, D., "The Internet IP Security Domain of Interpretation for ISAKMP", RFC 2407, November 1998. [RFC2629] Rose, M., "Writing I-Ds and RFCs using XML", RFC 2629, Carpenter & Jiang Expires May 13, 2013 [Page 5] Internet-Draft Next steps for 6renum November 2012 June 1999. [RFC2894] Crawford, M., "Router Renumbering for IPv6", RFC 2894, August 2000. [RFC3007] Wellington, B., "Secure Domain Name System (DNS) Dynamic Update", RFC 3007, November 2000. [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. [RFC4192] Baker, F., Lear, E., and R. Droms, "Procedures for Renumbering an IPv6 Network without a Flag Day", RFC 4192, September 2005. [RFC5887] Carpenter, B., Atkinson, R., and H. Flinck, "Renumbering Still Needs Work", RFC 5887, May 2010. 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 Carpenter & Jiang Expires May 13, 2013 [Page 6]