Also have a question on lp tables. What are they, are they automatically installed in linux, if not how do I install and use them?
Basically, iptables is a utility that lets you control your linux firewall. I believe they are installed by default and can be controlled either by editing the rules in /etc/sysconfig/iptables (fedora, centos) or through a GUI application:
there's a nice tutorial on iptables
Which distro are you using?
btw, firestarter is just another GUI utility to control iptables