So this is what I think is happening.
My router machine, running 3.10, has generic-receive-offload set on its
LAN port.
It happily sticks together five 1354 byte segments to make one nice
tasty 6670 byte segment.
Which then gets routed to a tun device, going to OpenVPN, so the fat
6670 byte segment gets split up into five 1354 byte segments.
But those segments don't have a valid checksum, so when the fall out of
the other end of the OpenVPN connection nobody will pay any attention to
them.
How sad.
What is to be done?
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