for things like IP addresses I would use IceFloor. But I would highly recommend not using any apple device as a firewall. They are very simple in design and do not assist in anything for network troubleshooting. I would recommend anything that runs DD-WRT or any other open WRT firmware. They provide a wide range of abilities and tweaks. Although, doing this on your laptop is a good idea as always when going out to the open world. You want to make sure you are covered not just behind the firewall at home.