@node Network
@section Network transport

You can use either UDP or TCP underlying network transport protocols.

TCP consumes more traffic: two additional bytes per packet. Also it is
has more complex and slightly slower code. Moreover because of packet
loss and TCP reliability it can lead to "meltdown" effect: significant
performance decrease of underlying TCP connections. So generally TCP is
not advisable for VPNs, but it can help with some nasty firewalls.