Hi,Out of interest, I'd like to let you know a specific use of OpenBSD with PF, in virtualbox, 2 virtual network card Bridged to physical NIC, and building up a subnet with NAT and hence running Packet Filter as the machine's firewall.
That's the firewall I use under Win7, OpenBSD running in a VM, out of pure interest into running BSD and let it purify the network access to desktop (without need for additional hardware).
Works well, love it. Jean-François