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用命令行方式关闭linux防火墙

#/sbin/iptables -I INPUT -p tcp --dport 80 -j ACCEPT  

#/sbin/iptables -I INPUT -p tcp --dport 22 -j ACCEPT  
#/etc/rc.d/init.d/iptables save 
重启计算机后,防火墙默认已经开放了80和22两个端口。
 
临时性的完全关闭防火墙,可以不重启机器:
#/etc/init.d/iptables status                ##查看防火墙状态
#/etc/init.d/iptable stop                   ##本次关闭防火墙
#/etc/init.d/iptable restart                ##重启防火墙
永久性关闭防火墙:
#chkconfig --level 35 iptables off   (注意中间的是两个英式小短线;重启)
 
附:
设置防火墙开放端口的方法如下:
vi /etc/sysconfig/iptables
修改防火墙时注意最好留下VNC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
要根据自己需求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。

用命令行方式关闭linux防火墙