[sig-policy]Address Policy SIG Proposal

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  • Subject: [sig-policy]Address Policy SIG Proposal
  • From: Anne Lord <anne at apnic dot net>
  • Date: Tue, 22 Jul 2003 11:54:37 +1000 (EST)
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      A proposal(P) is submitted below for the forthcoming Address Policy SIG
      in Korea on August 21st. It is a follow up to RIPE-261.
      Your comments and feedback are appreciated and most welcome.
      Best wishes,
      See you at APNIC 16
      Seoul, Korea, 19-22 August 2003          http://www.apnic.net/meetings
      A follow up to RIPE-261: Requesting larger IPv6 allocations from IANA 
      and practicing 'sparse allocations'
      Proposed by: APNIC Secretariat
      Version: 1.0
      Date: 22 July 2003
      1.	Summary
      The document 'IPv6 Address Space Management' (ripe-2611) proposes a model 
      for managing global unicast IPv6 address space through a system of 'sparse 
      allocations' from a global pool. This is different from the current regional 
      approach, which is based on existing IPv4 practices where each RIR receives 
      a separate block of IPv6 address space to manage. The objective of the 
      proposal was to maximise aggregation and to avoid the creation of an 'IPv6 
      swamp' of discontiguous address ranges.
      The proposal has recently been presented at RIR policy meetings(2) and has 
      been circulated on respective RIR policy discussion mailing lists. Feedback 
      received from the community has suggested general support for the aims of 
      the proposal (to maximize aggregation), but has differed on the actual 
      implementation details. There has been some regional consensus(3) in 
      favour of the RIRs receiving larger initial allocations of IPv6 address 
      space from the IANA (Internet Assigned Number Authority), within which 
      'sparse allocations' can be practiced.
      2.	Background and Problem
      The early system of IP address management for IPv4 created what is referred 
      to as the 'swamp' - a series of fragmented address ranges that cannot be 
      combined to form a single CIDR prefix. The existing system of IPv6 Address 
      Space management risks re-creating 'swamp' address space.
      The RIRs receive IPv6 allocations in fixed /23 blocks from IANA. Under the 
      current policy framework, the RIRs make /32 allocations (minimum) with 
      reservations up to a /29 prefix. Allocations are made sequentially, 
      thus no organisation can expect to receive a contiguous allocation once 
      the /29 reservation has been utilised.  In the longer term, the effect 
      of this practice will cause fragmentation of the address ranges, similar 
      to the 'swamp' space described above for IPv4. 
      The system of address space management proposed in 'IPv6 Address Space 
      Management' (ripe-261) specifically addresses this problem by maximising 
      the aggregatable prefixes received by any one ISP through a system of 
      allocations from a central pool of address space.  
      Internet community feedback reached no consensus on ripe-261. Objections 
      raised noted that the proposal, if implemented, would no longer allow 
      filtering on RIR allocations. 
      There is general support for trying to avoid the creation of an IPv6 
      'swamp' space. One approach, which preserves regional integrity but 
      which is conscious of the above, is for the IANA to allocate the RIRs 
      larger allocations. 
      3.	Proposal
      It is proposed that:
      * The IANA allocate IPv6 space to RIRs (including new RIRs) in prefix 
        units no less than /8.
      * The RIRs may practice 'sparse allocations' within the allocated blocks 
        and that the practice of reserving a /29 is discontinued.
      4.	Implementation
      A common consensus across the four RIR regions would be required before 
      any change is made to the existing management framework. If this is reached, 
      it is proposed that the usual three month period allowed for implementation 
      in the APNIC region is waived.
      5.	References
      (1) 'IPv6 Address Space Management' (ripe-261), Paul Wilson, Axel Pawlik, 
      Raymond Plzak. http://www.ripe.net/ripe/docs/ipv6-sparse.html
      (2) URLs of meeting discussions
      * APNIC http://www.apnic.net/meetings/15/sigs/policy
      * ARIN http://www.arin.net/library/minutes/ARIN_XI/ppm.html
      * RIPE NCC http://www2.ripe.net/ripe/wg/lir/r45-minutes.html
      (3)RIPE 45, Barcelona, Spain