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).
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）。
This paper assumes that there is only one faulty t switch or s module in a basic module, but multiple faults of different types are allowed to occur simultaneously within the faulty switch or module.
本文假设基本模块中只有一个T接线器或S模块有故障，但在此故障的T接线器或S模块范围内允许多种类型、多重故障同时发生。
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