ferm - 2.5.1-1.1 main

ferm is a frontend for iptables. It reads the rules from a
structured configuration file and calls iptables(8) to insert them
into the running kernel.
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ferm's goal is to make firewall rules easy to write and easy to
read. It tries to reduce the tedious task of writing down rules, thus
enabling the firewall administrator to spend more time on developing
good rules than the proper implementation of the rule.
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To achieve this, ferm uses a simple but powerful configuration
language, which allows variables, functions, arrays, blocks. It also
allows you to include other files, allowing you to create libraries
of commonly used structures and functions.
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ferm, pronounced "firm", stands for "For Easy Rule Making".