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Tutorial Basic Detail

a tutorial to UNDERSTANDING and CREATING your own rules

Things are explained very simply here but it WILL give you a good understanding what iptables is and how to begin writing a script.
http://www.tweako.com/iptables_explained_part_1_a_tutorial_to_understanding_and_creating_your_own_rules

Description:

Ok, so you have Linux installed and maybe a few services running like FTP, WWW etc. Now you want to share your Internet connection. Not the easiest but the most efficient way to do so is to use the Linux machine as a firewall/server. Linux comes with a very powerful firewall built in. It is totally scriptable but its not the easiest to understand. What follows is (hopefully) a good yet simple guide to WHAT iptables does and HOW it works.

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