Linux配置防火墙 开启80端口、3306端口的方法

vi /etc/sysconfig/iptables

-a input -m state –state new -m tcp -p tcp –dport 80 -j accept（允许80端口通过防火墙）
-a input -m state –state new -m tcp -p tcp –dport 3306 -j accept（允许3306端口通过防火墙）
特别提示：很多网友把这两条规则添加到防火墙配置的最后一行，导致防火墙启动失败，正确的应该是添加到默认的22端口这条规则的下面

添加好之后防火墙规则如下所示：

复制代码

代码如下:

# 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 tcp -p tcp –dport 22 -j accept
-a input -m state –state new -m tcp -p tcp –dport 80 -j accept
-a input -m state –state new -m tcp -p tcp –dport 3306 -j accept
-a input -j reject –reject-with icmp-host-prohibited
-a forward -j reject –reject-with icmp-host-prohibited
commit

/etc/init.d/iptables restart
#最后重启防火墙使配置生效