本节描述配置ssh客户机(本例中为PuTTY)的步骤，使之可以将本地主机的通信量转发到远程机器的目标端口。

This section describes the steps needed to configure SSH client (PuTTY, in this example) so that it can forward the traffic of localhost to the destined port on remote machine.

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映射之后，本地端口指定的所有通信量通过一个安全的SSH隧道转发到远程计算机上的映射端口上。

Once mapped, all the traffic destined for the local port is forwarded to the remote machine on the mapped port within a secured tunnel of SSH.

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客户机连接到端口 10000 后，被转发到远程主机的 PostgreSQL 服务器，后者正在侦听端口 5432：ssh -L 10000:localhost:5432 192.168.2.100。

The client, upon connecting to port 10000, is forwarded to the remote host's PostgreSQL server, which is listening on port 5432: ssh -L 10000:localhost:5432 192.168.2.100.

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