Iptables writing method
Iptables-F
Iptables-X
Iptables-An INPUT-m state-- state RELATED,ESTABLISHED-j ACCEPT
Iptables-An INPUT-I lo-j ACCEPT
Iptables-An INPUT-s 192.168.0 ACCEPT 24-j
Iptables-An INPUT-p tcp-- dport 25-j ACCEPT
Iptables-An INPUT-p tcp-- dport 110j ACCEPT
Iptables-An INPUT-p tcp-- dport 80-j ACCEPT
Iptables-An INPUT-j REJECT
Service iptables save
Service iptables restart