Use of Mason
I had heard about a couple of horror stories about folks hooking a Linux box up to Mediaone RoadRunner, and knew I needed a firewall. I had an old Win95 '486 box (24MB RAM, 400MB HD) that I wanted use as the firewall box. I bought a couple of NIC cards (LNE 2000/Linksys), dropped them in the box, and loaded RedHat Linux 6.1. After checking a couple of options, I found Mason. I called Mediaone, changed my MAC address, and brought up Linux on Mediaone. I set the IP_MASQ rule up, and had access to Mediaone from my internal LAN through the new (old) '486.
Not wanting the crackers to get in, I started up Mason, and watched it make a bunch of ipchains rules as I used the various applications from inside my home LAN. I saw a couple of scans from outside boxes, changed those rules from ACCEPT to DENY, and set the default rules policy to DENY on input.
So far, things have been running great. The mason-gui-text user interface is functional, and works fine on the text console. So far, I've been very pleased with Mason (developer version 0.13.0.92), and would recommend it to others. I had heard stories about folks getting their Mediaone access suspended because of crackers using their open Linux box, so this tool definitely helps.
An open, cross-platform journaling program.
A scientific plotting package.