Firewall Basics

Motivation

Protecting your Linux from threats on the Internet is ever more important today. For this you should turn off any service that you do not need and also keep your distribution up to date. A firewall also helps to prevent unwanted guests. Using Linux as a firewall to protect your network is also often a good idea. Last but not least: The NAT (Network Address Translation) built into the Linux firewall code is useful if you want a private network behind a Linux router.