daemons to the same multicast address, this will very likely cause routing loops.
Also note that this can cause decrypted VPN packets to be sent out on a real network if misconfigured.
.It fd
-Use a file descriptor.
+Use a file descriptor, given directly as an integer or passed through a unix domain socket.
+On Linux, an abstract socket address can be specified by using "@" as a prefix.
All packets are read from this interface.
Packets received for the local node are written to it.
.It uml Pq not compiled in by default