Install Firewall on CentOs

[Albert.Nawaro]

Install Firewall on CentOs

The very first first step on securing a server is installing a firewall (atleast IP tables based) to close all unused or unwanted ports. Once the firewall is installed it is often considered 50% of work done. You can install CSF firewall or APF firewall. Often BFD (brute force detection) utilities comes with firewall.

We will install CSF (Config security firewall) as it is easy to install with plenty of features and easily integrated to CPanel (if you are running)

PHP Code:

PHP Code:

wget http://www.configserver.com/free/csf.tgz
    tar zxf csf.tar.gz
    sh /csf/install.sh 


Follow the installer and once installed, you can start the firewall.
PHP Code:

PHP Code:

csf -s
    // start the firewall
    csf -r
    // restart the firewall
    csf -f 


// flush the rules or stop the firewall.