The client connects to the primary database using the public network using a virtual IP address.

客户端使用一个虚拟ip地址，通过公共网络连接到主系统数据库。

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Now, add the NAT rule. Right click, and select Map your private address name to your public address name, and select the line name of your physical network adapter.

将私有地址名称映射到公共地址名称，并选择物理网络适配器的线路名称。

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NAT technology maps an external public IP address to an internal IP address within the Amazon EC2 network.

NAT 技术将外部公共 IP 地址映射到 Amazon EC2 网络中的内部 IP 地址。

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Each instance belongs to a single network and any communication between instances in different networks must be through a public IP address.

FORBES: Google Announces Cloud Infrastructure Service: Google Compute Engine