在我們使用CentOS系統的時候,CentOS防火牆有時是需要改變設定的。CentOS防火牆預設是打開的,設定CentOS防火牆開放端口方法如下: 打開iptables的配置檔案:vi /etc/sysconfig/iptables 修改CentOS防火牆時注意:一定要給自己留好後路,留VNC一個管理端口和SSh的管理端口 下面是一個iptables的示例: # Firewall configuration written by system-config-securitylevel # Manual customization of this file is not recommended. *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] :RH-Firewall-1-INPUT - [0:0] -A INPUT -j RH-Firewall-1-INPUT -A FORWARD -j RH-Firewall-1-INPUT -A RH-Firewall-1-INPUT -i lo -j ACCEPT -A RH-Firewall-1-INPUT -p icmp –icmp-type any -j ACCEPT -A RH-Firewall-1-INPUT -p 50 -j ACCEPT -A RH-Firewall-1-INPUT -p 51 -j ACCEPT -A RH-Firewall-1-INPUT -m state –state ESTABLISHED,RELATED -j ACCEPT -A RH-Firewall-1-INPUT -m state –state NEW -m tcp -p tcp –dport 53 -j ACCEPT -A RH-Firewall-1-INPUT -m state –state NEW -m udp -p udp –dport 53 -j ACCEPT -A RH-Firewall-1-INPUT -m state –state NEW -m tcp -p tcp –dport 22 -j ACCEPT -A RH-Firewall-1-INPUT -m state –state NEW -m tcp -p tcp –dport 25 -j ACCEPT -A RH-Firewall-1-INPUT -m state –state NEW -m tcp -p tcp –dport 80 -j ACCEPT -A RH-Firewall-1-INPUT -m state –state NEW -m tcp -p tcp –dport 443 -j ACCEPT -A RH-Firewall-1-INPUT -j REJECT –reject-with icmp-host-prohibited COMMIT 修改CentOS防火牆需要注意的是,你必須根據自己伺服器的情況來修改這個檔案。 舉例來說,如果你不希望開放80端口提供web服務,那麼應該相應的删除這一行: 全部修改完之後重新開機iptables:service iptables restart 你可以驗證一下是否規則都已經生效:iptables -L 這樣,我們就完成了CentOS防火牆的設定修改。 =======轉自:================ http://www.linuxdiyf.com/linux/201105/47.html |