当一台在存根域 (网络) 中被分配了内部本地地址的计算机想要和外部网络通信时，数据包就会像通常一样被路由到其默认网关，此时网管充当 NAT 路由器功能。
When a computer on the stub domain that has an inside local address wants to communicate outside the network, the packet goes to one of the NAT routers by way of normal routing to the default-gateway.
这台计算机接收来自路由器的数据包，并且只要这台计算和外部网络通信，此过程就会重复执行。
The computer receives the packet from the router and the process repeats as long as the computer is communicating with the external system.
这是Snort最基本的功能，以包的形式检测和观察网络通信量是所有其他功能的基础。
This is probably Snort's most basic function, and everything else it does depends on this ability to detect and observe network traffic in a packet form.
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