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Centos 7的Firewalld防火墙基础-：努力变好
source link: https://blog.51cto.com/14156658/2453907
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一、Linux防火墙的基础Linux的防火墙体系主要工作在网络层，针对TCP/IP数据包实时过滤和限制，属于典型的包过滤防火墙（或称为网络层防火墙）。Linux系统的防火墙体系基于内核共存：firewalld、iptables、ebtables，默认使用firewalld来管理netfilter子系统。netfilter：指的是Linux内核中实现包过滤防火墙的内部结构，不以程序或文件的形式存在，
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