如果无法到达这个网关，那么从您主机上的网络适配器到网关的物理连接可能有问题（例如交换机端口、线路和网卡有故障）。
If it isn't, there may be a problem with the physical connection from the network adapter on your host to the gateway (for example, a faulty switch port, cable, network card).
每台计算机的网络适配器，也就是网卡都有自己独特的网卡地址。
Each computer 's network adapter card is the card has its own unique address.
每台计算机的网络适配器，也就是网卡都有自己独特的网卡地址。
Each computer 's network adapter card is the card has its own unique address.
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