Today, we released version 4.3.3 of the authoritative DNS nameserver NSD.
This release contains the DNS Flag Day 2020 fixes. This sets the default EDNS buffer size to 1232, that should reduce fragmentation. https://dnsflagday.net/2020/
There is a new feature where it is possible to list an interface by name. This pulls in the IP addresses associated with the interface at server start.
You can get source packages of this version from the downloads page.