yum install iptables-services
iptables -F
iptables-save | sudo tee /etc/sysconfig/iptables
Все правила, ну например:
iptables -A INPUT -p tcp --tcp-flags ALL NONE -j DROP
...
iptables -L -n
iptables-save | sudo tee /etc/sysconfig/iptables
service iptables restart
