InfoWorld: Make sure that those back doors stay locked by using Linux-based... [pmfirewall]Apr 28, 2000, 20:50 (0 Talkback[s])
(Other stories by Nicholas Petreley)
"Pmfirewall is a free program that automatically configures a Linux system as a firewall. For the most part, it just asks a series of simple questions, such as whether or not you want people to access an FTP server inside your firewall, and then creates a firewall configuration script based on the answers."
"Most people construct a firewall by using a utility called ipchains to create a set of rules for how your server should direct network traffic. Pmfirewall uses but doesn't replace ipchains. It simply relieves you of the tedious task of writing up the ipchains' firewall rules manually. And, because pmfirewall does such an excellent job of that, I used it to replace the set of ipchains' rules that I had already created the hard way."
"...because pmfirewall is released under the GNU GPL (General Public License), you can examine the source code for yourself to be sure it doesn't create a back door opening to your network."