[ppml] Policy Proposal 2005-8: Proposal to amend ARIN IPv6 assignment and utilisation requirement - revised text

Mon Mar 13 14:15:22 EST 2006

I think I support this proposal, but I have a couple questions about the
change to "the use of a /56 as the unit quantity in the calculation of the
ISP or LIR's end site allocation efficiency."  Specifically, will
assignment of a /48 to a customer automatically count as 256 fully
utilized /56's for these purposes?  What about the allocation of 128
/64's?  Would that count as a fully utilized or fully unutilized /56?  Or
can it be counted as what it is, a half-utilized /56?

I guess I'm just trying to tease out the implications on an ISPs ability
to get more space from using different assignment sizes for different
customers.

Thanks,
Scott

On 03/13/06 at 1:54pm -0500, Member Services <memsvcs at arin.net> wrote:

> Policy Proposal 2005-8: Proposal to amend ARIN IPv6 assignment and
> utilisation requirement has been revised by the authors. This proposal
> is open for discussion on this mailing list and will be on the agenda at
> the upcoming ARIN Public Policy Meeting.
>
> The current policy proposal text is provided below and is also available
> at: http://www.arin.net/policy/proposals/2005_8.html
>
> Regards,
>
> Member Services
> American Registry for Internet Numbers (ARIN)
>
>
> ### * ###
>
>
> Policy Proposal 2005-8: Proposal to amend ARIN IPv6 assignment and
> utilisation requirement
>
> Authors: Lea Roberts and Thomas Narten
>
> Proposal Version: 2 (10-Mar-2006)
>
> Proposal type: modify
>
> Policy term: permanent
>
> Policy statement:
>
> This proposal would amend the IPv6 address allocation policies (ARIN's
> NRPM, section 6) regarding the definition of the default size of End
> Site assignments and the threshold value for End Site allocation
> efficiency, no longer assuming the fixed values for End Site assignments
> established by RFC3177.  Many references to "/48" will need to be
> replaced by "End Site assignment".
>
> for example, section 6.5.4.1 should be replaced as follows:
>
>     6.5.4.1. Assignment address space size
>
>     End Users are assigned an End Site assignment from their LIR or
>     ISP. The exact size of the assignment is a local decision for the
>     LIR or ISP to make, using a minimum value of a /64 (when only one
>     subnet is anticipated for the End Site) up to the normal maximum
>     of /48, except in cases of extra large end sites where a larger
>     assignment can be justified.
>
>     The following guidelines may be useful (but they are only guidelines):
>
>     - /64 when it is known that one and only one subnet is needed
>
>     - /56 for small sites, those expected to need only a few subnets
>       over the next 5 years.
>
>     - /48 for larger sites
>
>     For end sites to whom reverse DNS will be delegated, the LIR/ISP
>     should consider making an assignment on a nibble (4-bit) boundary
>     to simplify reverse lookup delegation.
>
>     RIRs/NIRs are not concerned about which address size an LIR/ISP
>     actually assigns. Accordingly, RIRs/NIRs will not request the
>     detailed information on IPv6 user networks as they did in IPv4,
>     except for the cases described in Section 6.4.4 and for the
>     purposes of measuring utilization as defined in this document.
>
> also, section 6.9 will need to be replaced:
>
>     6.9. IPv6 Reassignments policy
>
>     The size of IPv6 address assignments to End Sites is to be
>     determined by the ISP/LIR.
>
>     ISPs and LIRs may choose whether to make changes to their
>     procedures for assigning address blocks to End Sites. The threshold
>     End Site allocation efficiency level is between 20% to 50% for most
>     ISPs and LIRs when based on a 0.94 HD Ratio. ISPs and LIRs will
>     need to operate address plans according to this target level of End
>     Site allocation efficiency.
>
>
> there's a need to change ARIN NRPM IPv6 Utilization:
>
>     The ARIN NRPM Section 6.7 will be amended so its IPv6 allocation
>     utilization criteria will reflect the use of a /56 as the unit
>     quantity in the calculation of the ISP or LIR's end site allocation
>     efficiency.
>
>     8. Rationale:
>
> The current IPv6 Address Allocation and Assignment Policy (section 6 of
> ARIN's NRPM) indicates that end sites should be allocated a /48 as a
> uniform allocation unit if using more than one host or one subnet.
>
> This proposal alters the existing policy regarding LIR and ISP
> assignments to End Sites to allow the unit of assignment to be an LIR or
> ISP decision.
>
> In assessing the address utilization efficiency for ISPs or LIRs, the
> definition of an End Site for the purposes of the calculation of ISP or
> LIR End Site allocation efficiency, is to be made according to a /56 size.
>
> This measure, if undertaken generally by all RIRs, in conjunction with
> the further measures undertaken by the addressing community regarding
> increasing the HD ratio to 0.94, would increase the anticipated useful
> lifetime of IPv6 to encompass a period in excess of 100 years, in which
> case no further allocation policy changes would be anticipated.
>
>
> A more detailed rationale is available in Geoff Huston's presentation on
> the subject, at RIPE 50, which can be found at:
> http://www.ripe.net/ripe/meetings/ripe-50/presentations/ripe50-plenary-wed-ipv6-roundtable-report.pdf
>
>
> ------------------------------------------------------------------------
>
> Appendix A. References
> This material is not formally part of the Policy Proposal. It is
> included here for informational purposes.
>
> 1. The IPv6 Address Plan - Geoff Huston
> http://www.potaroo.net/ispcol/2005-07/ipv6size.html
>
> 2. Internet Draft: Issues Related to the Management of IPv6 Address
> Space - Thomas Narten
> http://tools.ietf.org/wg/ipv6/draft-narten-iana-rir-ipv6-considerations-00.txt
>
> [unfortunately, the ID expired, so use the URL:
>
> http://www.cs.duke.edu/~narten/ietf/draft-narten-iana-rir-ipv6-considerations-00.txt]
>
>
> 3. Internet Draft: IPv6 Address Allocation to End Sites - Thomas Narten,
> Geoff Huston & Lea Roberts
> http://www.ietf.org/internet-drafts/draft-narten-ipv6-3177bis-48boundary-01.txt
>
>
> Timetable for implementation: upon adoption
>
>
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