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Netfilter简介

阅读更多
一 什么是Netfilter
Netfilter是Linux操作系统核心层内部的一个数据处理模块。
 
二 什么是Hook point
数据包在Netfilter中的挂载点。
(PRE_ROUTING、INPUT、OUTPUT、FORWARD、POST_ROUTING)
 
三 Netfilter与iptables的关系


 
 
四 iptables的规则组成
组成部分:四张表(filter表、nat表、mangle表、raw表)+五条链(PRE_ROUTING、INPUT、OUTPUT、FORWARD、POST_ROUTING)+规则
filter表:访问控制、规则匹配
nat表:地址转发
 
五 数据包在规则表、链匹配流程


 
 
 
 

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>

 
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