NAT对内网主机的出网数据包进行网络地址变换，内网主机可以使用保留地址上网，外网主机无法直接访问内网主机，从而实现单向通信。
NAT would do network address translation for outbound packet so that inside hosts can use reserved IP addresses and outside hosts can not visit inside ones directly to realize one-way communication.
测试外网通过MAP访问企业内部服务器。
Test outer net passes through MAP to visit enterprise internal server.
测试外网通过MAP访问企业内部服务器。
Test outer net passes through MAP to visit enterprise internal server.
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