NAT 仅转换在内部和外部网络之间被指定需要被转换的流量。
NAT only translates traffic which travel between the inside and outside network and is specified to be translated.
近年来，内部网络和外部网络的边界变得模糊。
The boundary between the internal and external network has blurred over the years.
这是为了让虚拟以太网设备能够访问物理以太网适配器和外部网络。
This is required in order for the virtual Ethernet devices to access the physical Ethernet adapter and the external network.
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