一、具体的异常现象
1、启动或者关闭防火墙没任何的提示
[root@ethnicity ~]# /etc/init.d/iptables start
[root@ethnicity ~]# /etc/init.d/iptables stop
2、查看防火墙的状态直接提示模块未加载
[root@ethnicity ~]# /etc/init.d/iptables status
iptables: Firewall modules are not loaded.
二、修复的方法
默认的情况下安装防火墙Iptables的Linux服务默认需要加载两个模块
[root@ethnicity ~]# lsmod |grep iptable
iptable_filter 2173 1
ip_tables 9567 1 iptable_filter
很简单加载这两个模块就行了
[root@ethnicity ~]# modprobe ip_tables
[root@ethnicity ~]# modprobe iptable_filter
[root@ethnicity ~]# lsmod |grep iptable
iptable_filter 2173 0
ip_tables 9567 1 iptable_filter
这样就好了
[root@ethnicity ~]# /etc/init.d/iptables restart
iptables: Setting chains to policy ACCEPT: filter [ OK ]
iptables: Flushing firewall rules: [ OK ]
iptables: Unloading modules: [ OK ]
iptables: Applying firewall rules: [ OK ]
原文：http://www.cnblogs.com/bethal/p/5206496.html