centos添加防火墙规则
2014-01-04 16:19:00   来源:   浏览: 次

导读:CentOS防火墙默认是打开的,设置CentOS防火墙开放端口方法如下: 打开iptables的配置文件: vi etc sysconfig iptables 修改CentOS防火墙

CentOS防火墙默认是打开的,设置CentOS防火墙开放端口方法如下:

打开iptables的配置文件:
vi /etc/sysconfig/iptables
修改CentOS防火墙时注意:一定要给自己留好后路,留VNC一个管理端口和SSh的管理端口

下面是一个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防火墙需要注意的是,你必须根据自己服务器的情况来修改这个文件。

举例来说,如果你不希望开放80端口提供web服务,那么应该相应的删除这一行:
-A RH-Firewall-1-INPUT -m state –state NEW -m tcp -p tcp –dport 80 -j ACCEPT

全部修改完之后重启iptables:
service iptables restart

你可以验证一下是否规则都已经生效:iptables -L

这样,我们就完成了CentOS防火墙的设置修改。