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Tutorial: A Firewall for Linux with IPchains

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You may already have what you need for a firewall.
This tutorial will cover using a linux computer as a gateway between a private network and the internet. Any internet connection whether it be a dial-up PPP, DSL, cable modem or a T1 line can be used. In the case of most dial-up PPP connections and cable modem connections, only a single IP address is issued allowing only one computer to connect to the internet at a time. Using Linux and iptables / ipchains one can configure a gateway which will allow all computers on a private network to connect to the internet via the gateway and one external IP address, using a technology called "Network Address Translation" (NAT) or masquerading. Iptables/ipchains can also be configured so that the Linux computer acts as a firewall, providing protection to the internal network.
 read more | mail this link | score:6421 | -Ray, November 25, 2000 (Updated: June 14, 2003)
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