How install a Firewall on Linux and block IP’s that bruteforce your system

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Whenever I setup a Linux VPS, the first thing I do is install a firewall. I have noticed an increase in attacks on my servers, especially from China. I use
Config Server Firewall (CFG) and Login Failure deamon (LFD) because they are easy to set up and provide additional features like suspicious file reporting and system monitoring.

http://techarena51.com/index.php/how-to-configure-and-install-config-server-firewall-login-failure-daemon/