CentOS切換為iptables防火墻

切換到iptables首先應該關掉默認的firewalld，然後安裝iptables服務。

1、關閉firewall：

service firewalld stop
systemctl disable firewalld.service #禁止firewall開機啟動

2、安裝iptables防火墻

yum install iptables-services #安裝

3、編輯iptables防火墻配置

vi /etc/sysconfig/iptables #編輯防火墻配置文件

下邊是一個完整的配置文件：

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   #開放端口，復制一條改對應的端口就可以了

 
-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

:wq! #保存退出

service iptables start #開啟
systemctl enable iptables.service #設置防火墻開機啟動
 

CentOS切換為iptables防火墻並進行相關配置