.Nm tinc
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.
+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
Create a UNIX socket with the filename specified by
.Va Device ,
If you specified a
.Va Device ,
this variable is almost always already correctly set.
+.It Va InvitationExpire Li = Ar seconds Pq 604800
+This option controls the period invitations are valid.
.It Va KeyExpire Li = Ar seconds Pq 3600
This option controls the period the encryption keys used to encrypt the data are valid.
It is common practice to change keys at regular intervals to make it even harder for crackers,
.Sh SEE ALSO
.Xr tincd 8 ,
.Xr tinc 8 ,
-.Pa http://www.tinc-vpn.org/ ,
+.Pa https://www.tinc-vpn.org/ ,
.Pa http://www.tldp.org/LDP/nag2/ .
.Pp
The full documentation for