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.
在清单3的示例包中，192.168.1.104正是运行Snort的机器的IP地址，而192.168.1.1则是该机器的网络通往外部网络的路由器的地址。
In the example packet from Listing 3, 192.168.1.104 happens to be the IP address of the machine running Snort, and 192.168.1.1 is the router that machine's network USES to get to the outside world.
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