[sig-policy] prop-058-v001: Proposal to create IPv4 shared use address s

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  • Subject: [sig-policy] prop-058-v001: Proposal to create IPv4 shared use address space, among LIRs
  • From: Randy Bush <randy at psg dot com>
  • Date: Mon, 28 Jan 2008 13:23:34 +0900
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    • [ posted by co-chair as chair is a co-author ]
      Dear SIG members
      The proposed policy 'Proposal to create IPv4 shared use address space
      among LIRs' has been sent to the Policy SIG for review. It will be
      presented during the Policy SIG sessions at APNIC 25 in Taipei, Taiwan,
      25-29 February 2008.
      The proposal's history can be found at:
      We invite you to review and comment on the proposal on the mailing list
      before the meeting.
      The comment period on the mailing list before an APNIC meeting is an
      important part of the policy development process. We encourage you to:
            - Ask the proposer questions if anything in the proposal is
            - Point out advantages and disadvantages you see in the proposal
            - State whether you support or oppose the proposal
      Mailing list discussions will be taken into account when the proposal
      is discussed at the upcoming APNIC meeting. So please make sure you have
      your say.
      APNIC Policy SIG Chairs
      Toshiyuki Hosaka
      Randy Bush
      Jian Zhang
      prop-058-v001: Proposal to create IPv4 shared use address space
                     among LIRs
      Author:      Shirou Niinobe <nin at syce dot net>
      Co-authors:  Takeshi TOMOCHIKA
                   Jiro YAMAGUCHI
                   Dai NISHINO
                   Hiroyuki ASHIDA
                   Akira NAKAGAWA
                   Toshiyuki HOSAKA
      Version:     1
      Date:        28 January 2008
      1.  Introduction
      This proposal is to create IPv4 shared use address space among LIRs
      in AP region, for the effective use of the IPv4 address space.
      2.  Summary of current problem
      LIRs providing firewall and IP connectivity services behind NATs using
      RFC 1918 address space face potential address space collisions between
      end user networks that are using the same RFC 1918 address ranges.
      This is preventing LIRs and their end users from benefitting from the
      security and efficient IPv4 address use that firewalls and NATs can
      Instead, some LIRs are applying (and receiving) global IPv4 address
      allocations to providing firewall and IP connectivity services.
      Furthermore, if LIRs assign only IPv6 addresses to end users, they
      cannot communicate with non-IPv6 ready site.
      By having IPv4 shared use address space as an alternative to RFC 1918
      address ranges, LIRs would not need to request global IPv4 allocations
      to achieve their aims. Therefore LIRs can continue to provide IP
      connectivity after IPv4 free pool exhaustion.
      3.   Situation in other RIRs
      No RIR currently has address space for this purpose.
      On 3 August 2007, the following Internet Draft was submitted to the
          - Redesignation of 240/4 from "Future Use" to "Limited Use for
            Large Private Internets"
      4.   Details of the proposal
      4.1. It is proposed that:
           - APNIC create IPv4 shared use address space for use by LIRs in
             the AP region
           - APNIC reserve one /8 for this purpose
      4.2. Conditions for use of this shared use address space are:
          - All LIRs in the AP region can use the address space
          - LIRs can choose a range within the shared space for their use
            without needing to apply to APNIC or NIRs
          - LIRs do not need to register use of their chosen shared use
          - Global/regional address uniqueness is not guaranteed
          - End-users cannot use this proposed address space and should
            continue to use the existing RFC 1918 address ranges.
          - LIRs are free to assign this shared use addresses to their
          - Use of shared use address space will not be included when
            calculating APNIC fees
      5.   Advantages and disadvantages of the proposal
          - It promotes effective use of global IPv4 address space, as the
            largest LIRs will use this proposed address space rather than
            global addresses
          - By using this shared use address space, LIRs can continue to
            provide IPv4 connectivity even after the IPv4 address exhaustion
          - LIRs can provide IPv4 connectivity by dual-stacking shared use
            addresses with IPv6 addresses. This is important as we currently
            do not have high-throughput IPv6-IPv4 translators for commercial
          - Concerns may be raised that global IPv4 addresses that can be
            allocated to LIRs diminishes by one /8 (however, in the long run,
            this proposal will save more address than that space)
      6.   Effect on APNIC members
      APNIC members will have the option of both IPv4 global address space
      and shared use address space
      7.   Effect on NIRs
      NIRs are expected to adopt the same policy at their discretion.