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Internet Connection Sharing
Linux as a broadband router
  Linux has a very powerful IP stack built into the operating system. Linux itself has the capability of routing your lan to the internet with NAT or Network Address Translation (explain NAT). In the Linux world this is often called IP Masquerading. Here is a HowTo at LinuxDoc
My favorite way to use Linux as a router is with a micro-distribution. There are versions of Linux out there that run off of a single floppy disk. Using one of these distributions, you can convert an old, unused computer (even a 486!) into a capable broadband router. Since the software fits on a floppy, you don’t even need a hard drive in the system! Most of the micro-distributions of Linux routers have minimum requirements of a 386 with 16Mb of memory.
My favorite linux router is called Cyote Linux. Cyote Linux has a very cool installation and configuration method. Cyote Linux starts with a Windows program. Run it, and you can actually configure the router in Windows. Next, a program creates a bootable floppy disk that has your fully configured Linux broadband router!
Micro-distribution based broadband router projects
Cyote Linux
Linux Router Project
EDGE Firewal, a Lineo Embedix ThinLinux demonstration of embedded computing products
For NetBSD Fans, The NetBSD/i386 Firewall Project
General Linux Networking Links
Linux Firewall and Security Site
Networking with Linux
IP Masquerading How-To
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