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华为防火墙安全策略的详细介绍-栗子老师的博客
source link: https://blog.51cto.com/13817711/2484181
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安全策略包过滤能够通过报文的源MAC地址、目的MAC地址、源IP地址、目的IP地址、源端口号、目的端口号、上层协议等信息组合定义网络中的数据流，其中源IP地址、目的IP地址、源端口号、目的端口号、上层协议就是在状态检测防火墙中经常所提到的五无组，统防火墙根据五元组的包过滤规则来控制流量在安全区域间的转发下一代防火墙的安全策略不仅可以完全替代包过滤的功能，还进一步实现了基于用户和应用的流量转发控
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