> Commonly, people block ICMP, and over IPv6 this blocks fragments because > ICMP PMTU Discovery ICMP messages need to traverse the firewall. Some > firewalls do not support UDP-connection-tracking with fragmentation on > IPv6 (such as pf). These are random IPv6 hints ... :-) > > Best regards, > Wouter As you mentioned pf specifically I just re-checked some things, it works with a newer version of pf. The older version on my home system seems to drop these packets and it works with pf turned off. So now I know where the real problem is, thank you.