(In the process of using the router, there will be various failures. This article will use the H3C router to introduce us how to deal with the failure of the WAN. If the WAN is connected to the network through the router device, then the discovery When the WAN is frequently disconnected, you can quickly log in to the local router's background management interface, and execute the Ping command to send a test packet to the WAN port address connected to the other router's device to see if the other party's WAN connection port can be pinged. Pass.)