Fault set of Wireless LAN

The development of network technology drives economic prosperity. In such a high-frequency wireless network technology, how should we eliminate and solve network faults? Here we will introduce it. When a wireless network is faulty, you should first troubleshoot several key issues. Some hardware problems may cause network errors and incorrect configuration may also cause the network to fail. In this article, we will introduce some methods and techniques for troubleshooting wireless network errors. This article focuses on basic wireless networks rather than special wireless networks.

Hardware troubleshooting for wireless LAN faults

When there is a connection problem with only one access point and one wireless client, we may quickly find the client with the problem. However, when the network is very large, it may not be that easy to locate the problem.

In a large wireless network environment, if some users cannot connect to the network, but other customers do not have any problems, it is likely that one of the many access points has a fault. Generally, by looking at the physical location of the client with network problems, you can probably determine which access point has a problem.

When all customers cannot connect to the network, the problem may come from many aspects. If your network only uses one access point, the access point may have hardware problems or incorrect configuration. In addition, it may be due to too much radio interference or a connection problem between the Wireless Access Point and the wired network.

Check the connectivity of access points in the case of a wireless LAN fault

To determine the cause of the network connection failure, first check whether the computer in the network environment can connect to the Wireless Access Point normally. A simple detection method is to enable command line mode on a computer in your wired network, and then ping the IP address of the wireless access point. If the Wireless Access Point responds to the ping command, this proves that the computer in the wired network can connect to the Wireless Access Point normally. If the Wireless Access Point does not respond, it may be due to a problem in the wireless connection between the computer and the wireless access point, or the Wireless Access Point itself has a fault.

To determine what the problem is, you can try to ping the IP address of the wireless access point from the wireless client. If the problem succeeds, the network connection of the computer may be faulty, for example, the network cable is damaged.

If the wireless client cannot ping the wireless access point, the Wireless Access Point itself is abnormal. You can restart it, wait about five minutes, and then use the ping command to view its connectivity through the computer and wireless client in the Wired Network.

If the ping to the wireless access point still does not respond, it indicates that the wireless access point is damaged or the configuration is incorrect. At this time, you can connect this possibly damaged wireless access point to a normal network through an available network cable. You also need to check its TCP/IP configuration. Then, ping the Wireless Access Point again on the wired network client. If the connection still fails, the wireless access point is damaged. Then you should replace the new wireless access point.

Configuration of Wireless LAN faults

The quality of wireless network devices is generally trustworthy. Therefore, the biggest problem is generally caused by the configuration of devices rather than the hardware. With this in mind, let's take a look at several common network connection failures caused by misconfiguration.

Test signal strength of Wireless LAN faults

If you can directly ping the Wireless Access Point through the network cable, but not wirelessly, you can basically identify that the fault of the wireless access point is temporary. If the problem persists after debugging, you can check the signal strength of the Access Point. Although most network administrators do not have a standard method for measuring the signal strength of wireless networks, most network adapter manufacturers will include a mechanism for measuring the signal strength.

How to change the channel when the wireless LAN fails

If you find that the signal strength is weak after testing, but you haven't made any changes recently, you can try to change the channel of the Wireless Access Point and use a wireless terminal to check whether the signal is enhanced. Since modifying the connection channel on all wireless terminals is not a small project, you should first test it on a wireless terminal to prove it is effective before it can be implemented in a large area. Remember, sometimes wireless network failures may suddenly improve because an employee hangs up his cell phone or closes the microwave oven.

SSID verification for wireless LAN faults

Not long ago, I took my notebook to work at a friend's house. I decided to connect to my friend's network because I used wireless networks. When I got home, I didn't use this notebook any more. After two weeks, when I opened my notebook again, I found that it could not connect to my wireless network. Soon I found the root cause of the problem: I forgot to change the Service Identifier (SSID, Service Set Identifier) back to my own network ID. Remember, if your SSID does not specify the network correctly, your laptop will not ping the wireless access point, and it will ignore the existence of the wireless access point, search for the corresponding Access Point Based on the given SSID.

Test WEP Key for wireless LAN faults

Check WEP encryption settings. If WEP is set incorrectly, you cannot ping the wireless access point from the wireless terminal. You must specify different WEP keys for wireless network adapters and Access Points of different vendors. For example, some wireless NICs require you to enter a hexadecimal key, while others require you to enter a decimal key. Similarly, some vendors adopt 40-bit and 64-bit encryption, while others only support 128-bit encryption.

To make WEP work properly, all wireless clients and access points must match correctly. Most of the time, although the wireless client seems to have configured WEP correctly, it still cannot communicate with the wireless access point. In this case, I usually restore the wireless access point to the factory state, re-enter the WEP configuration information, and start the WEP function.