#/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。 (责任编辑:IT) |