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@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?
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