THIS IS OLD. USE IPTABLES NOW.
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.
Your donation will support ongoing development and give you access to the PDF version of this book. Desktop Survival Guides include Data Science, GNU/Linux, and MLHub. Books available on Amazon include Data Mining with Rattle and Essentials of Data Science. Popular open source software includes rattle, wajig, and mlhub. Hosted by Togaware, a pioneer of free and open source software since 1984. Copyright © 1995-2021 Graham.Williams@togaware.com Creative Commons Attribution-ShareAlike 4.0.