Re: [knot-dns-users] forcing minimal fragment size for IPv6 datagrams

If it were me, I would instead use the "max-udp-payload" option, set to 1280, so that Knot emits responses with TC set. This may cause some clients to retry over TCP. But one missing feature in Knot is that it doesn't allow tuning of the EDNS payload separately for IPv4 and IPv6. It might be useful to have "max-udp-payload-ipv4" and "max-udp-payload-ipv6" options for setting this separately, because IPv4 and IPv6 behaviours are different.