ConfigServer Firewall (or CSF) is a free and advanced firewall for most Linux distributions. In addition to the basic functionality of a firewall – filtering packets – CSF includes other security features, such as login/intrusion/flood detections. CSF includes UI integration for cPanel, DirectAdmin and Webmin.
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In order to install CSF , login to your server with root user
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Download the CSF installation pack
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The downloaded file is a compressed form of a tar package, and has to be uncompressed and extracted before it can be used. To extract the file use the command and hit enter.
tar -xzf csf.tgz
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Now it is time to execute the CSF’s installer script. Move to the csf directory and execute the installation script as shown below.
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The firewall is now installed, but you should check if the required iptables modules are available. You can check it with below command
perl /usr/local/csf/bin/csftest.pl
The firewall will work if no fatal errors are reported