Individual Submission G. Huston Internet-Draft APNIC Expires: August 1, 2005 January 31, 2005 Proposed changes to the format of the IANA IPv6 Registry draft-huston-ip6-iana-registry-05.txt Status of this Memo This document is an Internet-Draft and is subject to all provisions of section 3 of RFC 3667. By submitting this Internet-Draft, each author represents that any applicable patent or other IPR claims of which he or she is aware have been or will be disclosed, and any of which he or she become aware will be disclosed, in accordance with RFC 3668. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet-Drafts. 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." The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt. The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. This Internet-Draft will expire on August 1, 2005. Copyright Notice Copyright (C) The Internet Society (2005). Abstract This document proposes a revised format for the IANA IPv6 address registries. Rather than a formal definition of the format, it is described by giving examples of the (current as of publication of this document) contents of the registries in the proposed format. The proposed format would bring the IANA IPv6 address registries into alignment with the current IPv6 Address Architecture specification, as well as updating it to a more useful and generally accepted format. Huston Expires August 1, 2005 [Page 1] Internet-Draft IANA IPv6 Registry January 2005 1. Introduction This document proposes a revised format for the IANA IPv6 address registries. The proposed format would bring the IANA IPv6 address registries into alignment with the current IPv6 Address Architecture specification, as well as updating it to a more useful and generally accepted format. The current (as of publication of this document) IANA IPv6 registries [iana-ipv6-registry][iana-ipv6-tla] are based on a now-deprecated address architecture that used the concept of Top Level Aggregation Identifiers (TLAs) and sub-TLAs. The current IPv6 Address Architecture [RFC3513] uses the terminology of Global Identifiers instead of TLAs and sub-TLAs. 2. IPv6 Address Registry The proposed registry format for the IPv6 address registry is indicated by example, using the registry state current as of preparation of this document, in Figure 1. The registry explicitly notes which entity is placing a reservation on an address block and notes the defining RFC document for each allocation. The proposed format of the registry is a title line, the date of the last change to the registry, the registry in a tabular format, notes and references. The table uses 4 columns. Within the table, the first column is an IPv6 address prefix, using a hexadecimal notation of the address prefix and a prefix length. There are no overlapping address blocks in the first column, and the set of address blocks in the registry span the entire IPv6 address space. The second column denotes the current disposition of each address block, using notation as derived from the defining RFC document. The third column is a reference to the RFC that describes the current disposition of the address block. The fourth column uses numeric footnote notation to reference any additional text associated with the address block. The notes in the registry may include a summary of previous disposition status values associated with an address block, as this summary is specifically not included in the registry table. The notes are numbered sequentially. The reference section uses a conventional citation format. The references include documents referenced in the registry table and documents referenced in the notes. ----------------------------------------------------- Huston Expires August 1, 2005 [Page 2] Internet-Draft IANA IPv6 Registry January 2005 INTERNET PROTOCOL VERSION 6 ADDRESS SPACE [last updated 13 January 2005] IPv6 Prefix Allocation Reference Note ----------- ---------- --------- ---- 0000::/8 Reserved by IETF RFC3513 [1] 0100::/8 Reserved by IETF RFC3513 0200::/7 Reserved by IETF RFCxxxx [2] 0400::/6 Reserved by IETF RFC3513 0800::/5 Reserved by IETF RFC3513 1000::/4 Reserved by IETF RFC3513 2000::/3 Global Unicast RFC3513 [3] 4000::/3 Reserved by IETF RFC3513 6000::/3 Reserved by IETF RFC3513 8000::/3 Reserved by IETF RFC3513 A000::/3 Reserved by IETF RFC3513 C000::/3 Reserved by IETF RFC3513 E000::/4 Reserved by IETF RFC3513 F000::/5 Reserved by IETF RFC3513 F800::/6 Reserved by IETF RFC3513 FA00::/7 Reserved by IETF RFC3513 FC00::/7 Reserved by IETF RFC3513 FE00::/9 Reserved by IETF RFC3513 FE80::/10 Link Local Unicast RFC3513 FEC0::/10 Reserved by IETF RFC3879 [4] FF00::/8 Multicast RFC3513 Notes: [0] The IPv6 address management function was formally delegated to IANA in December 1995 [RFC1881]. [1] The "unspecified address", the "loopback address", and the IPv6 Addresses with Embedded IPv4 Addresses are assigned out of the 0000::/8 address block. [2] 0200::/7 was previously defined as an OSI NSAP-mapped prefix set [RFC1888]. This definition has been deprecated as of December 2004 [RFCxxxx]. [3] The IPv6 Unicast space encompasses the entire IPv6 address range with the exception of FF00::/8. [RFC3513] IANA unicast address assignments are currently limited to the IPv6 unicast address range of 2000::/3. IANA assignments from this block are registered in the IANA registry: iana-ipv6-unicast-address-assignments Huston Expires August 1, 2005 [Page 3] Internet-Draft IANA IPv6 Registry January 2005 [4] FEC0::/10 was previously defined as a Site-Local scoped address prefix. This definition has been deprecated as of September 2004 [RFC3879]. References: [RFC1881] The IAB and IESG, "IPv6 Address Allocation Management", RFC1881, December 1995. [RFC1888] J. Bound et al, "OSI NSAPs and IPv6", RFC1888, August 1996. [RFC3513] R. Hinden and S. Deering, "IP Version 6 Addressing Architecture", RFC 3513, April 2003. [RFC3879] C. Huitema and B. Carpenter, "Deprecating Site Local Addresses", RFC 3879, September 2004. [RFCxxxx] B. Carpenter, "RFC1888 is obsolete", RFC xxxx (work in progress: draft-carpenter-obsolete-1888-01.txt). ----------------------------------------------------- Figure 1 2.1 Notes on Proposed Format Changes to the Registry o The textual preamble at the start of the registry has been removed, in deference to the use of standard IPv6 prefix notation in the registry. o Binary prefix notation has been replaced by standard IPv6 prefix hexadecimal notation, and the fraction of address space column has been replaced with the reference to the relevant RFC that defines the disposition of the address block. Footnote references are also displayed in a consistent fashion. o The terminology "Unassigned" has been replaced by the more precise phrase "Reserved by IETF", indicating the body that has the token to permit reassignment of the status of this address block. o The "Formerly Site-Local" entry in the body of the registry has been replaced with an explicit reference to deprecation. A similar treatment is proposed for 0200::/8, although the RFC number for the deprecation document has yet to be assigned. There is a distinction drawn between the current status of a registry and the set of registry actions that have lead to the current Huston Expires August 1, 2005 [Page 4] Internet-Draft IANA IPv6 Registry January 2005 state. The registry table describes the current status of the registry, while the text footnotes are used to describe the set of transactions leading to the current state, including any former states. o Annotations that are references to footnotes are included in the registry in its own column o The text commentary on unicast, multicast and anycast addresses has been removed as there is no distinction between anycast and unicast addresses and multicast addresses are explicitly flagged in the registry. o A note and a corresponding reference to RFC1881 was added to record the formal delegation of the IPv6 address management function to IANA. 3. Global Unicast IPv6 Address Registry The proposed registry format for Global Unicast IPv6 address block allocations is indicated by example, using the registry state current as of preparation of this document, in Figure 2. The registry notes the current allocations, and does not include any notation of intended future allocations or reservations. All address space not listed in this registry forms the IANA unallocated address pool, to be allocated by IANA as per the prevailing address allocation policies. The proposed format of the registry is a title line, the date of the last change to the registry, the registry in a tabular format, notes and references. The table uses 4 columns. Within the table, the first column is an IPv6 address prefix, using a hexadecimal notation of the address prefix and a prefix length. There are no overlapping address blocks in the first column. The entries here describe only IANA allocations of address blocks. Temporary IANA reservations for future allocations, allocation expansion windows and any other internal IANA states are not described in this registry. The second column describes the current disposition of the address block, either by noting the RIR to whom the address block was assigned, or the intended use of the address block. The third column is the date of the IANA allocation, including the day of the month. The fourth column uses numeric footnote notation to reference any additional text associated with the address block. The notes in the registry may include a summary of previous disposition status values associated with an address block, as this Huston Expires August 1, 2005 [Page 5] Internet-Draft IANA IPv6 Registry January 2005 summary is specifically not included in the registry table. The notes are numbered sequentially. The reference section uses a conventional citation format. The references include documents referenced in the registry table and documents referenced in the notes. ----------------------------------------------------- IPV6 GLOBAL UNICAST ADDRESS ASSIGNMENTS [last updated 13 January 2005] Global Unicast Prefix Assignment Date Note --------------------- ---------- ------ ---- 2001:0000::/23 IANA 01 Jul 99 [1] 2001:0200::/23 APNIC 01 Jul 99 2001:0400::/23 ARIN 01 Jul 99 2001:0600::/23 RIPE NCC 01 Jul 99 2001:0800::/23 RIPE NCC 01 May 02 2001:0A00::/23 RIPE NCC 02 Nov 02 2001:0C00::/23 APNIC 01 May 02 [2] 2001:0E00::/23 APNIC 01 Jan 03 2001:1200::/23 LACNIC 01 Nov 02 2001:1400::/23 RIPE NCC 01 Feb 03 2001:1600::/23 RIPE NCC 01 Jul 03 2001:1800::/23 ARIN 01 Apr 03 2001:1A00::/23 RIPE NCC 01 Jan 04 2001:1C00::/22 RIPE NCC 01 May 04 2001:2000::/20 RIPE NCC 01 May 04 2001:3000::/21 RIPE NCC 01 May 04 2001:3800::/22 RIPE NCC 01 May 04 2001:4000::/23 RIPE NCC 11 Jun 04 2001:4200::/23 ARIN 01 Jun 04 2001:4400::/23 APNIC 11 Jun 04 2001:4600::/23 RIPE NCC 17 Aug 04 2001:4800::/23 ARIN 24 Aug 04 2001:4A00::/23 RIPE NCC 15 Oct 04 2001:4C00::/23 RIPE NCC 17 Dec 04 2001:5000::/20 RIPE NCC 10 Sep 04 2001:8000::/19 APNIC 30 Nov 04 2001:A000::/20 APNIC 30 Nov 04 2002::/16 6to4 01 Feb 01 [3] 2003:0000::/18 RIPE NCC 12 Jan 05 3FFE::/16 6BONE 01 Dec 98 [4] Notes: Huston Expires August 1, 2005 [Page 6] Internet-Draft IANA IPv6 Registry January 2005 [0] The assignable Global Unicast Address space is defined in [RFC3513] as being the address block defined by the prefix 2000::/3. All address space in this block not listed in the table above is reserved by IANA for future allocation. [1] The prefix assigned to the IANA, 2001:0000::/23, is for assignment for testing, experimental and trial usage by IANA [RFC2928]. [2] 2001:0DB8::/32 has been assigned as a NON-ROUTABLE range to be used for documentation purpose [RFC3849]. [3] 2002::/16 is reserved for use in 6to4 deployments [RFC3056] [4] 3FFE::/16 is an experimental allocation to the 6BONE [RFC2471]. This prefix will be returned to the unassigned address pool on the 6th June 2006 [RFC3701]. References: [RFC2471] Hinden, R., R. Fink, J. Postel, "IPv6 Testing Address Allocation", RFC2471, December 1998. [RFC2928] Hinden, R., Deering, S., Fink, R., Hain, T., , "Initial IPv6 Sub-TLA ID Assignments", RFC2928, September 2000. [RFC3056] Carpenter, B., K. Moore, "Connection of IPv6 Domains via IPv4 Clouds without Explicit Tunnels", RFC 3056, February 2001. [RFC3513] Hinden, R., "IP Version 6 Addressing Architecture", RFC3513, April 2003. [RFC3701] Fink, R., "6Bone (IPv6 Testing Address Allocation) Phaseout", RFC 3701, March 2004. [RFC3849] Huston, G., A. Lord, P. Smith, "IPv6 Address Prefix Reserved for Documentation", RFC 3849, July 2004. ----------------------------------------------------- Figure 2 Huston Expires August 1, 2005 [Page 7] Internet-Draft IANA IPv6 Registry January 2005 3.1 Notes on Proposed Format Changes to the Registry o The current registry name "iana-ipv6-tla-assignments" should be renamed to "iana-ipv6-unicast-address-assignments". o The title of the registry has been altered to remove the reference to "TOP LEVEL AGGREGATION IDENTIFIER". o The TLA and Sub-TLA identifier assignments have been rolled into a single set of address prefixes and their assignment. o The text commentary at the start of the registry contents has been removed. o Binary value notation of the address prefixes has been removed. o Further commentary on assignments, such as the planned phase out of the 6BONE, is placed in a footnote. o The registry continuation lines using ellipsis notation have been removed. o Only assigned addresses are listed. All unassigned addresses, marked in the original IANA registry with the assignment note of "(future assignment)" have been removed, as has the entry marked as "reserved *)". o Address assignments are listed using prefix size notation of the actual allocation, rather than reporting the allocation in sub-units of /23 prefixes. o The date of the IANA action includes the day of the month as well as the month and year. 4. IANA Considerations IANA is advised to adopt these formats for the IPv6 address registry and the IPv6 Global Unicast address registry. 5. Security Considerations Security of the Internet's routing system relies on the ability to authenticate an assertion of unique control of an address block. Measures to authenticate such assertions rely on validation that the address block forms part of an existing allocated address block, and that there is a trustable reference from the IANA address registry to the references Regional Internet Registry (RIR), and a trustable reference from the RIR's registry to a Local Internet Registry or end Huston Expires August 1, 2005 [Page 8] Internet-Draft IANA IPv6 Registry January 2005 user Internet Service Provider. The proposed format for the IANA registry is a small step towards the creation of a registry that can be used as a trust point for commencing a chain of address validation. Consideration should be given to IANA registry publication formats that are machine parseable, and also the use of file signatures and associated certificate mechanisms to allow applications to confirm that the registry contents are current, and that they have been published by the IANA. 6. Acknowledgements This document was prepared with the assistance of Kurt Lindqvist, Thomas Narten, Paul Wilson, David Kessens, Bob Hinden and Brian Haberman. Pekka Savola, Brian Carpenter, Christian Huitema and Michael Patton provided helpful review comments. 7. References 7.1 Normative References [RFC3513] Hinden, R. and S. Deering, "Internet Protocol Version 6 (IPv6) Addressing Architecture", RFC 3513, April 2003. 7.2 Informative References [iana-ipv6-registry] IANA, "IANA IPv6 Address Registry", December 2004. [iana-ipv6-tla] IANA, "IANA Registry of IPv6 Top Level Aggregation Identifier Assignments", December 2004. Author's Address Geoff Huston Asia Pacific Network Information Centre EMail: gih@apnic.net URI: http://www.apnic.net Appendix A. Draft Notes [This section not for RFC publication] This memo has been prepared as part of the activities of an ad hoc Huston Expires August 1, 2005 [Page 9] Internet-Draft IANA IPv6 Registry January 2005 advisory committee to advise the IAB on a number of matters relating to IPv6. It is proposed that the note be published as an Internet Standards action for IPv6 as a BCP. As noted in the Security Considerations Section this is a step in the direction of updating the IANA address registry to be a seed trust point in the operation of validating addresses. It is noted that further study is appropriate to determine what forms of additional information and formats should be published to allow systems to use this data in a trustworthy manner. The format provided here could be provided through the use of a base registry format using an XML scheme. Such an XML scheme for IPv6 registry specification is not considered in this document, but is a topic that is recommended for further study. Huston Expires August 1, 2005 [Page 10] Internet-Draft IANA IPv6 Registry January 2005 Intellectual Property Statement The IETF takes no position regarding the validity or scope of any Intellectual Property Rights or other rights that might be claimed to pertain to the implementation or use of the technology described in this document or the extent to which any license under such rights might or might not be available; nor does it represent that it has made any independent effort to identify any such rights. Information on the procedures with respect to rights in RFC documents can be found in BCP 78 and BCP 79. Copies of IPR disclosures made to the IETF Secretariat and any assurances of licenses to be made available, or the result of an attempt made to obtain a general license or permission for the use of such proprietary rights by implementers or users of this specification can be obtained from the IETF on-line IPR repository at http://www.ietf.org/ipr. 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Acknowledgment Funding for the RFC Editor function is currently provided by the Internet Society. Huston Expires August 1, 2005 [Page 11]