[address-policy-wg] IXP pool lower boundary of assignments

On Tue, Nov 1, 2022 at 10:31 AM Wolfgang Tremmel <
wolfgang.tremmel at de-cix.net> wrote:

> No. But renumbering an IX is *pain*. A lot of pain. You want to avoid that
> if possible.
> A /26 allows (given that the IX uses about 2-4 IPs itself) about 60
> customers.
>
> So according to the numbers, for 70% of the IXes this will never fill up,
> so no need for renumbering.
> Depending on how quickly it filled up, you then go either for a /25 or a
> /24.
>
> To sum up:
> - if you start with a /26 ==> 30% has to renumber
> - if you start with a /29 ==> 75% has to renumber ---> more pain!
>

I think maybe we want something in between; what do /27 and /28 look like?

/29 could be forcing too much pain into the system, and /26 probably isn't
enough pain in the system.

Furthermore, /29 seems a little too small for a reasonable growth cycle
before having to renumber. 50% fill of a /29 would be 3 of 6 usable
addresses. Meaning many IXes could almost immediately qualify for a larger
subnet, and they would have very much time to implement a renumbering
process.

Whereas with a /28, 50% fill would be 7 of 14 usable addresses. That seems
like it would allow for reasonable growth before having to renumber and
some runway to actually accomplish the renumbering process.

Basically, a /29 is probably too small to be practical.

Thanks


> > Am 1. Nov 2022 um 15:48 schrieb Tore Anderson <tore at fud.no>:
> >
> > If not, how exactly would a default
> > /29 policy «cripple» an IX from growing past 6 members, or a default
> > /28 «cripple» it from growing past 14 members for that matter?
>
> --
> Wolfgang Tremmel
>
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