linux6.0修改防火墙设置？

改Linux系统防火墙配置需要修改 /etc/sysconfig/iptables 这个文件

vim /etc/sysconfig/iptables

在vim编辑器，会看到下面的内容

# Firewall configuration written by system-config-firewall

# Manual customization of this file is not recommended.

*filter

:INPUT ACCEPT

:FORWARD ACCEPT

:OUTPUT ACCEPT

-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

-A INPUT -m state –state NEW -m tcp -p tcp –dport 8080 -j ACCEPT

-A INPUT -m state –state NEW -m tcp -p tcp –dport 3306 -j ACCEPT

-A INPUT -m state –state NEW -m tcp -p tcp –dport 2181 -j ACCEPT

-A INPUT -j REJECT –reject-with icmp-host-prohibited

-A FORWARD -j REJECT –reject-with icmp-host-prohibited

COMMIT

需要开放端口，请在里面添加一条一下内容即可:

-A RH-Firewall-1-INPUT -m state –state NEW -m tcp -p tcp –dport 1521 -j ACCEPT

其中 1521 是要开放的端口号，然后重新启动linux的防火墙服务。

Linux下停止/启动防火墙服务的命令(root用户使用)：

service iptables stop –停止

service iptables start –启动

写在最后:

#永久性生效，重启后不会复原

chkconfig iptables on #开启

chkconfig iptables off #关闭

#即时生效，重启后复原

service iptables start #开启

service iptables stop #关闭