[ Thanks to Nemilar
for this link. ]
“One of the great features included in Linux is the IPtables
firewall. Unfortunately, its command-line use is rather complex,
and it can be intimidating for even experienced Linux users to
configure it. Firestarter is a friendly graphical interface that
allows you to configure a software firewall in Linux using the
built-in IPtables/IPchains utilities.“Installing Firestarter is simple; it’s contained in most
distribution’s repositories…”