"IPTables scripts really are little programs, and style is as
important in these scripts as it is when working in any other
programming language. The scripts should be logical and human
readable. In this spirit, the first thing we are going to do is
improve the flow of our firewall, even though it will not change
its functionality at all. We are going to create our own custom
chain and direct all the services we want to allow through it."
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