CentOS 7.0默认使用的是firewall作为防火墙。

systemctl start firewalld.service#启动firewall
systemctl stop firewalld.service#停止firewall
systemctl disable firewalld.service#禁止firewall开机启动

systemctl start iptables.service#启动iptables

systemctl stop iptables.service#停止iptables

systemctl disable iptables.service#禁止iptables开机启动