v6 DNSSEC fail, was Buying IPv4 blocks

John Levine johnl at iecc.com
Fri Oct 5 01:07:21 UTC 2018

In article <60afb948-5f6d-8ea8-00c9-6d4d92ff0269 at forfun.net>,
Marco Davids via NANOG <mdavids at forfun.net> wrote:
>> Even if you do have v6, some things like DNSSEC don't work very well
>> if you can't do them over v4.
>Is that so?

Yeah, V6 UDP fragmentation and anycast are bad news.  You can sort of
fix it by doing all your v6 DNSSEC DNS queries over TCP but it's a lot
easier to stick to v4.

Geoff Huston has written about this a lot and it's a well known problem
in the DNS community.  I'm surprised if it's news to anyone here.


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