OK, I have not seen it yet, so I'll offer what someone else showed me about firewalling:
http://plonk.sourceforge.net/ I've got a ipchains version of this set to run on startup on a Debian 486. It has very good comments, is easy to customize and tells you what it's doing. It's just the thing for a 486. All I have to do to it is ssh into it and apt-get update and upgrade every now and then. Box has no keyboard, monitor or mouse so it eats little power makes little noise and takes up next to no space. It's 500 meg hard drive has been going strong for more than ten years and I trust it more than a floppy. Heh, what else am I going to do with a 500 meg hard drive? I once dropped a 2 gig hard drive in it and used it as an ftp server but stopped that when the FBI raided 27 cable modem uncappers in Toledo for obtaining cable services without authorization. The site says that there is an ipchains version as well, but I did not look into that. A useful, though somewhat dated book is "Building Linux and OpenBSD Firewalls" by Sonnenreich and Yates.
