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Firstly, create a basic Linux shell script that includes commands to completely secure the firewall, disallowing all remote connections to, and through the firewall.

Another important element of a firewall is the logging of activity that allows for easy troubleshooting. Once this has been accomplished it is time to open up the firewall for the protocols and ports that are needed.

In this regard there are a number of policies that require particular attention. These would be the OUTPUT, INPUT and FORWARD policies.

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