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How to do it...

We begin with installing Shorewall on our system using the apt-get command:

Once the installation is complete, try to start Shorewall. You will get an error message as shown here:

This means we need to first configure Shorewall before it can start running.

To configure Shorewall, edit the /etc/default/shorewall file in the editor of your choice. Look for the line that reads startup=0 and change its value to 1:

Next, edit ...

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