Yes, you certainly can. At my last place of employment, I built a custom BSD (packetfilter) based router using the nice multiport gigabit intel NICs. We had s

Yes, you certainly can. At my last place of employment, I built a custom BSD (packetfilter) based router using the nice multiport gigabit intel NICs. We had static IP configuration, which meant all I had to do was put the default_router and standard interface configuration into /etc/rc.conf and, as they say, voila, internets!