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To have the tap(4) module automatically loaded at boot time, add the
following to /etc/lkm.conf:

${PREFIX}/lkm/tap.o - - ${PREFIX}/sbin/tap_postinstall - -

And then add 'lkm=YES' to /etc/rc.conf.  Refer to lkm.conf(5) for
additional details.

The script ${PREFIX}/sbin/tap_postinstall creates the relevant device
nodes in /dev, and can be used independently.
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