When the gateway is disconnected, the first step is to determine whether there is a problem with the internal network. Usually, it can be determined through the jitter ping test internal network gateway. The packet loss rate of the internal network should be 0, with wired ping values generally within 1 ms and wireless ping values between 1 ms and 20 ms.

If there is packet loss, reduce lag, or high ping values, then the problem lies in the internal network. Need to troubleshoot issues with internal network cables, loops, switches, and other equipment.

After troubleshooting the internal network issue, ping the public IP address. If it doesn't work, the problem lies in the router gateway. For a commonly used DNS server, the ping reducer value on the public network is generally between 1ms and 50ms, which is higher than that on the internal network. If the public network can be pinged and the ping value is normal without packet loss, it indicates that the external network is normal. Otherwise, the external network is abnormal, and it is necessary to investigate the router and WAN port circuit issues.

If the external network can be pinged, but still cannot connect to the network, then it is usually a problem with DNS. You can determine this by pinging the domain name.

For a local area network, network disconnection is basically catastrophic, and leaders and colleagues immediately groan and rush to occupy the path. As a network manager, it is inevitable to often encounter network outages. Maintaining a calm mind and quickly identifying the problem is a fundamental skill for a network administrator.