GitLab

(this is still buggy vis-a-vis net30 routing...)

(do this for the same reason as on client side; this would not be
necessary in the real implementation.)

These should be the best way to tell TCP sessions to reduce their window
to the tunnel's effective MTU, and to fragment real-MTU-sized UDP
packets.  This way, we don't need to mess with changing MTU on any of
the tunneled hosts; and hopefully we can still avoid most of the
fragmentation (since most or all of the cross-cluster flows are TCP).

(Won't have to do this in the real thing; their route will already be
the /29 gateway.  Just have to do it here cause we're in Emulab and we
already have a gateway.)

Unfortunately this is static, and must be specified in the main conf
file.  Something dynamic might be nice...