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iptables之state扩展与开启被动模式ftp-liximkuan的博客
source link: http://blog.51cto.com/11975865/2090892
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1.state扩展 该扩展至关重要，正是由于state才实现了连接追踪机制。 连接追踪机制：每一台客户端与本地主机进行通讯时（有可能是通过本地主机去访问其他主机），本地主机都会在内存的一段空间中存储源IP、源端口、目标IP、目标端口的信息（每条记录都有生存时间）。当客户端下次再与本地主机进行通讯时，就可以通过查找之前存储的信息来追踪该客户端是否与本地主机
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