• A Linux server with ip/xtables installed and running.
  • Any of the following distributions installed RedHat/CentOS/CloudLinux 5-7, Fedora, openSUSE, Debian, Ubuntu, Slackware.

What is CSF?

CSF is a set of extension scripts to iptables on Linux, that integrates with various control panels and Linux distribution packages to enhance the security standing of your server, for example CSF can detect brute forcing of your SSH server and automatically ban the offending IP’s at the firewall level, thwarting any brute force attacks easily. It also contains some configuration options that make things like traffic limiting very simple

Change to a different folder to keep it neat.

cd /usr/src

Remove any previous versions you’ve downloaded.

rm -fv csf.tgz

Download the latest version of the firewall.


Extract the package.

tar -xzf csf.tgz

Change to the package directory.

cd csf

Run the install script.