After learning what CSF / LFD module can do, it is time for a small guide on how to install them. The guide is for RHEL type version of Linux which consist of Redhat, Fedora and CentOS. A separate procedure is needed for Debian based Linux which will be added later.
ConfigServer Security & Firewall (CSF) is a stateful packet inspection firewall (SPI), login/intrusion detection, and security application for most Linux distributions and Linux based VPS.
CSF is versatile enough to host more features other than the standard filtering of packets. CSF can give you login detection, brute force detection, system intrusion and flood detection. CSF have a UI integration for cPanel, DirectAdmin and Webmin.
CSF can also detect port scans, SYN flood and can temporarily or permanently block clients who are flagged as an attacker.