1 ,编辑/etc/sysconfig/iptables文件，如：
-A RH-Firewall-1-INPUT -p tcp -m state -m tcp --dport 53 --state NEW -j ACCEPT
-A RH-Firewall-1-INPUT -p udp -m state -m udp --dport 53 --state NEW -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m state -m tcp --dport 25 --state NEW -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m state -m tcp --dport 80 --state NEW -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m state -m tcp --dport 88 --state NEW -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m state -m tcp --dport 110 --state NEW -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m state -m tcp --dport 143 --state NEW -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m state -m tcp --dport 843 --state NEW -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m state -m tcp --dport 3000 --state NEW -j ACCEP

2,重起iptalbes服务：service iptables restart