How to configure firewall on CentOS cPanel server to use IPSET

This will improve your firewall's  performance

Install IPSET using:

yum install ipset ipset-devel -y

Update configuration file /etc/csf/csf.conf. Value for LF_IPSET needs to be set to 1 to get it enabled

Once its done go ahead and increase DENY_IP_LIMIT and DENY_TEMP_IP_LIMIT values for example up to 3000

You may use the following sed command for that

sed -i -e 's/LF_IPSET = "0"/LF_IPSET = "1"/g' /etc/csf/csf.conf
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