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.

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。

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If a route is not found, the packet is sent to the source host's default gateway, also called a router.

如果找不到路径，数据包就被送往发送端主机的默认网关，有时也称为路由器。

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Internet telephony gateway technology allows data that was previously transmitted in the circuit domain to be transmitted in the packet domain.

该网关技术允许先前在电路域中传输的数据在包域中传输。

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The truly paranoid may elect to use the 2.4 kernels' Netfilter4 facility (adding stateful packet filtering) or a commercial application-level proxy gateway.

CNN: Analysis: Linux security

In a patent app made public this month, RIM's lab geeks describe setting up a proxy server right on the phone that would intercept the browser's web requests and bundle, compress, and send them to a gateway on the other end (BIS, we presume) that would know how to deal with the packet.

ENGADGET: RIM patent app will have you barely browsing the web at incredible speeds