I have a simple local area network where my router is also the DHCP server. It's IP address is 192.168.2.1.

For testing purposes I've been playing with a second DHCP server on the same network running inside VirtualBox - that machine is set to 192.168.2.99 …

This isn't so much of a proper how-to, but mostly notes to self on how to quickly setup IPFW on FreeBSD 9.

To enable IPFW:

Open up /etc/rc.conf and add the following lines:

firewall_enable="YES" #Enables the firewall - the most important line :)
firewall_logging="YES" #optional - enables logging - logs …