vi /etc/rc.local

/bin/kenv net.inet.ip.fw.default_to_accept=1
/sbin/kldload ipfw
/sbin/kldload ipfw_nat
/sbin/kldload ipdivert
/sbin/kldload dummynet
/bin/sh /etc/ipfw.rules

vi /etc/ipfw.rules

/sbin/ipfw -f -q flush
/sbin/ipfw pipe 7 config bw 10512Kbit/s
/sbin/ipfw add pipe 7 ip from any to 192.168.150.0/24 out
#####/sbin/ipfw pipe 8 config bw 10512Kbit/s
#####/sbin/ipfw add pipe 8 ip from 192.168.150.0/24 to any in

reboot