fastd is a secure tunneling daemon with some unique features: - Very small binary - Exchangable crypto methods - Transport over UDP for simple usage behind NAT - Can run in 1:1 and 1:n scenarios - There are no server and client roles defined by the protocol, this is just defined by the usage. - Only one instance of the daemon is needed on each host to create a full mesh If no full mesh is established, a routing protocol is necessary to enable hosts that are not connected directly to reach each other