How to Install Iptables on CentOS 7

Starting with CentOS 7, FirewallD replaces iptables as the default firewall management tool. FirewallD is a complete firewall solution that can be controlled with a command-line utility called firewall-cmd. If you are more comfortable with the Iptables command line syntax, then you can disable FirewallD and go back to the classic iptables setup.