其中两个配置私有 IP 地址，另一个配置公共 IP 地址。

Two with private IP address and one with public IP address. As shown in the image below, enter the relevant fields for en0 (which you will configure for a public IP address).

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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。

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

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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。

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

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