The following options are currently supported:
.RS
-.IP "\fBport=\fIportno\fR"
-Specifies \fIportno\fR (a number between 1 and 255) as the port number
-at which \fInetdev\fR will be attached. By default, \fBadd\-if\fR
-automatically selects the lowest available port number.
-
.IP "\fBinternal\fR"
Instead of attaching an existing \fInetdev\fR, creates an internal
port (analogous to the local port) with that name.