@node MTU
@section MTU

MTU command line argument is maximum allowable size of outgoing GoVPN's
packets. It varies and depends on your environment, so probably has to
be tuned. By default MTU equals to 1452 bytes: 40 bytes per IPv6 and 8
bytes per UDP.

Underlying TAP interface has lower MTU value -- 42 bytes smaller: 26
bytes overhead on transport message and 14 bytes for Ethernet frame.
Client and server will print what MTU value should be used on TAP
interface.