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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
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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.
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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.
-----------------------------------------------------
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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
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[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
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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
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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:
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[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
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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
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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
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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.
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