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Article: Using Linux as a firewall. (Linux).
- Article from:
- Australian PC World
- Article date:
- June 1, 2002
- Author:
CopyrightCOPYRIGHT 2002 IDG Communications Pty. Ltd - Australia. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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This month we discuss how to secure an Internet gateway (or any Linux computer connected to the Internet, for that matter) using a firewall. A firewall is essentially a barrier between a computer and the network to which it is connected: it inspects data travelling in both directions and only permits certain data to pass, according to a set of rules given to the firewall when it is set up.
The most basic firewall strategy, and the one we will implement in this article, is to deny all connections from the outside network, while allowing the local computer to access the outside network without restriction. With this configuration we can access the Internet as we ...