MTU#
Disable Path MTU discovery for specify ip/subnet by setting it manually#
ip route add default via 10.0.0.1 mtu 296
In general, it is possible to override PMTU Discovery by setting specific routes. For example, if only a certain subnet is giving problems, this should help:
ip route add 195.96.96.0/24 via 10.0.0.1 mtu 1000