* Thor Spruyt: > Packets: > > $ sudo tcpdump -nn -p host 2a02:348:a1:bd32::1 > 19:33:04.426128 IP6 2a02:1111:1111::1.60034 > 2a02:348:a1:bd32::1.53: 10024 > [1au] DS? www.veilingzaalmelase.be. (53) > 19:33:04.434834 IP6 2a02:348:a1:bd32::1 > 2a02:1111:1111::1: frag (0|1232) 53 > > 60034: 10024*- 0/4/1 (1224) > 19:33:04.434846 IP6 2a02:348:a1:bd32::1 > 2a02:1111:1111::1: frag (1232|66) > > So the server responds with 2 fragments, while there should be no > reason for this.
Proactive fragmentation irrespective of path MTU is required for stateless IPv6 UDP services. Unlike IPv4, the network does not fragment packets. So a UDP service has to conservatively fragment around 1200 or so bytes (to account for tunnel overhead). Or perhaps send a TC response instead, and avoid fragmentation altogether. _______________________________________________ dns-operations mailing list [email protected] https://lists.dns-oarc.net/mailman/listinfo/dns-operations
