1. First, the device of the single-receiver operator, such as the optical cat, pings the gateway or DNS server address of the operator, and gets a value;
2. Connect the router again (unplug other network lines) and ping again;
3. Then connect to other computers for normal use before ping;
Get 3 values, which is too big or has lost a packet is where the problem is, the first time is the operator line bad, the second time is the router has Problem. The third time an exception indicates a problem with the LAN.