man ppp
-direct
This is used for communicating over an already established con-
nection, usually when receiving incoming connections accepted by
getty(8). ppp ignores the ``set device'' line and uses descrip-
tor 0 as the link. ppp will also ignore any configured chat
scripts unless the ``force-scripts'' option has been enabled.
If callback is configured, ppp will use the ``set device'' infor-
mation when dialing back.
или mode поменяй или не майся дурью, а как нормальный человек в rc.conf пропиши маршрут до vpnd, а в /usr/local/etc/rc.d/999.vpn.sh
/usr/local/sbin/pptp 192.168.10.253 1