I like to put some servers behind that scheme.

2601::443:xxxx for https servers

2601::25:xxxx for MTA servers.

2601::993:xxxx for IMAP

It gives a quick note of what is that ip even though it’s ipv6 and usually non-human readable.

Not sure what kind of scheme is use by medium/big ISP.

Do you go by zip code of the area covered or some kind of logical to help people know what is behind that ipv6 network?

Jean

From: NANOG <nanog-bounces+jean=ddostest.me@nanog.org> On Behalf Of Baldur Norddahl
Sent: November 28, 2021 8:22 AM
To: NANOG <nanog@nanog.org>
Subject: Re: IPv6 and CDN's

søn. 28. nov. 2021 13.59 skrev Masataka Ohta <mohta@necom830.hpcl.titech.ac.jp>:

But, with manually configured IP addresses, it is trivially easy
to have a rule to assign lower part of IP addresses within a subnet
for hosts and upper part for routers, which is enough to troubleshoot
most network failures.

99% if not 100% of our subnets have either only routers or only hosts + a gateway. So that would be a strange rule to follow. Also very expensive if we are talking public addressing.

I find that 10.x.y.z is not much if you want to have a system in your subnet numbering. With ipv6 there is much more space to enable systematic numbering schemes.