[arin-ppml] Draft Policy ARIN-2024-8: Restrict the Largest Initial IPv6 Allocation to /20

[Scott Leibrand]

Why is this policy needed if "only a single IPv6 allocation exceeds a /20
in size"?

If we're about 10 years into serious use of IPv6, and have used one /16,
then we have about 80,000 years before this becomes an urgent issue for
ARIN, and 650,000 years before we'll run out. Yes, those extrapolations are
dumb, but so is arguing over how many millennia of runway we have.

-Scott

On Tue, Jun 25, 2024 at 11:32 AM ARIN <info at arin.net> wrote:

> On 20 June 2024, the ARIN Advisory Council (AC) accepted “ARIN-prop-335:
> Restrict the Largest Initial IPv6 Allocation to /20” as a Draft Policy.
>
> Draft Policy ARIN-2024-8 is below and can be found at:
>
> https://www.arin.net/participate/policy/drafts/2024_8/
>
> You are encouraged to discuss all Draft Policies on PPML. The AC will
> evaluate the discussion to assess the conformance of this draft policy with
> ARIN's Principles of Internet number resource policy as stated in the
> Policy Development Process (PDP). Specifically, these principles are:
>
> * Enabling Fair and Impartial Number Resource Administration
> * Technically Sound
> * Supported by the Community
>
> The PDP can be found at:
>
> https://www.arin.net/participate/policy/pdp/
>
> Draft Policies and Proposals under discussion can be found at:
> https://www.arin.net/participate/policy/drafts/
>
>
> Regards,
>
> Eddie Diego
> Policy Analyst
> American Registry for Internet Numbers (ARIN)
>
>
> Draft Policy ARIN-2024-8: Restrict the Largest Initial IPv6 Allocation to
> /20
>
> Problem Statement:
>
> In order to promote aggregation, the NRPM currently allows initial
> allocations up to a /16. However, the entire IPv6 address space only
> contains 65536 /16s, and the space allocated to IANA for globally routable
> purposes only contains 8192 /16s. Therefore, a /16 is a sufficiently large
> portion of the IPv6 address space that the goal of conservation starts to
> outweigh the goal of aggregation.
>
> Policy statement:
>
> 6.5.2.1b: Replace "In no case shall an ISP receive more than a /16 initial
> allocation." with "In no case shall a LIR receive more than a /20 initial
> allocation."
>
> Comments:
>
> A quick look at ARIN's stats shows that only a single IPv6 allocation
> exceeds a /20 in size:
>
> grep "ipv6" delegated-arin-extended-latest  | grep allocated | cut -d '|'
> -f 5 | sort | uniq -c
>       1 16
>       8 20
>      22 22
>      39 24
>       2 27
>     127 28
>      15 29
>       6 30
>      21 31
>    4236 32
>       1 33
>       2 35
>    1401 36
>       1 37
>       1 38
>    1050 40
>      11 41
>      13 42
>       9 43
>     851 44
>      16 45
>      15 46
>      26 47
>    1754 48
>
> Timetable for implementation: Immediate
>
>
>
>
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