.Nm
is built into your kernel, the network interfaces cannot be removed).
.Pp
On older systems without
.Xr devfs 5
support,
.Xr MAKEDEV 8
should be used to create the initial control devices and the task
of locating an unused device is left up to the opener (a
device is usually obtained by attempting to open
.Pa /dev/tap0 ,
and if that fails
.Pa /dev/tap1
etc., until an
.Va errno
of
.Er EBUSY
is not received).
On systems with