Andrey V. Elsukov wrote: > On 20.12.2019 19:22, Victor Sudakov wrote: > >> What's the root of the problem? ESP packets cannot get fragmented or > >> what? > > > > Wireshark has shown that the "Don't Fragment" flag is set on all ESP > > (protocol 50) packets. Who does this, why, and how can I switch it off > > globally? > > Hi, > > I think this DF flag is originally from TCP packet.
You are probably right. I did not think of this. > ESP xform for transport mode just replaces protocol in IP header and > adds some info to the end of a packet. It is rather easy to verify your theory. If you are right, then disabling net.inet.tcp.path_mtu_discovery globally should remove the DF flags from the ESP packets too, right? Of course, net.inet.tcp.path_mtu_discovery=0 is not a solution, it's just a way to check the origin of the DF flag. And if you are right, what does it mean to us? Did you see https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242744 already ? My ultimate wish is to make transport mode work out of the box, without any workarounds like additional host routes or firewall rules. -- Victor Sudakov, VAS4-RIPE, VAS47-RIPN 2:5005/49@fidonet http://vas.tomsk.ru/
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