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73.fileter表案例，NAT表的应用-雷神闪-51CTO博客
source link: http://blog.51cto.com/sdwaqw/2068777
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fileter表案例要求如下：只针对filter表，预设策略INPUT链DROP，其他两个链ACCEPT，然后针对192.168.204.0/24开通22端口，对所有网段开放80端口，对所有网段开放21端口。这个需求不算复杂，但是因为有多条规则，所以最好写成脚本的形式。脚本内容如下root@zlinux~]#cat/usr/local/sbin//iptables.shcat:/usr/local
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