Enabling iptables On CentOS 7

It is possible to go back to a more classic iptables setup. First, stop and mask the firewalld service:

systemctl stop firewalld
systemctl mask firewalld
Then, install the iptables-services package:

yum install iptables-services
Enable the service at boot-time:

systemctl enable iptables
Managing the service

systemctl [stop|start|restart] iptables
Saving your firewall rules can be done as follows:

service iptables save
or

/usr/libexec/iptables/iptables.init save