vi /etc/sysconfig/iptables-a input -m state –state new
-m tcp -p tcp –dport 80
-j accept（允許80埠通過防火牆）
-a input -m state –state new
-m tcp -p tcp –dport 3306
-j accept（允許3306埠通過防火牆）
# 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]
-ainput -m state –state established,related -j accept
-ainput -p icmp -j accept
-ainput -i lo -j accept
-ainput -m state –state new -m tcp -p tcp –dport 22 -j accept
-ainput -m state –state new -m tcp -p tcp –dport 80 -j accept
-ainput -m state –state new -m tcp -p tcp –dport 3306 -j accept
-ainput -j reject –reject-with icmp-host-prohibited
-aforward -j reject –reject-with icmp-host-prohibited
commit
/etc/init.d/iptables restart
#最後重啟防火牆使配置生效
-a input -m state –state new
-m tcp -p tcp –dport 3306
-j drop
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