GNU/Linux Desktop Survival Guide by Graham Williams
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Firewalls

THIS IS OLD. USE IPTABLES NOW.

Debian Packages: bastille

A firewall can be set up on a machine connected to the Internet and can then relay network traffic to machines connected on a local network.

The bastille package provides both a firewall and Network Address Translation (NAT—also referred to as IP Masquerading). When installing the package use the defaults and all should be just fine.