[[email protected] uums]# vi /etc/sysconfig/iptables

# Firewall configuration written by system-config-firewall
# Manual customization of this file is not recommended.
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
 

-A INPUT -i lo -j ACCEPT
-A INPUT -m state --state NEW -m udp -p udp --dport 111 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 8984 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 3889 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT
-A INPUT -j REJECT
 
 --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT

比如放開埠20，就加上
-A INPUT -m state –state NEW -m tcp -p tcp –dport 20 -j ACCEPT
然後重啟防火牆即可生效
啟動防火牆的命令：service iptables start
關閉防火牆的命令：service iptables stop
注意：有的機器需要同時設定ip6tables，同上設定即可