3 @cindex Network transport
6 @subsection Network transport
8 You can use either UDP or TCP underlying network transport protocols.
10 TCP is more resource hungry. Moreover because of packet loss and TCP
11 reliability it can lead to "meltdown" effect: significant performance
12 loss of underlying TCP connections. Generally TCP is not advisable for
13 VPNs, but it can help with some nasty firewalls.