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The wireless AP device is used to centrally connect all wireless nodes and perform centralized management. Of course, a typical wireless AP also provides a wired Ethernet interface for connection to wired networks, workstations, and routing devices. A wireless AP plays a vital role in a wireless network. It is equivalent to a relay that connects all nodes. Below we will introduce 10 ways to quickly troubleshoot wireless APs.
1. The wireless connection rate is reduced. The wireless network device can intelligently adjust the transmission rate to adapt to changes in the wireless signal strength and ensure the smoothness of the wireless network. However, if the network connection speed is lower than 2Mb/s for a continuous period of time, it indicates that the network may be faulty. You can perform the following operations to restore the original transmission rate:
2.1) Check if the power saving mode of the wireless network card is enabled. When the power saving mode is adopted, the transmission power of the wireless network card will be greatly reduced, resulting in a weakening of the wireless signal, thereby affecting the transmission rate of the wireless network.
2) Check if there is an obstruction between the wireless devices. If there is an obstruction between the wireless network card, or between the wireless network card and the wireless AP, especially the metal obstruction, the transmission of the wireless signal will be seriously affected. It is recommended to place the wireless AP in a higher position in the room to make it visible to the wireless network card.
3) Check if there are other interference devices. Devices such as microwave ovens and cordless phones that have similar frequencies to wireless networks can cause large interference to wireless transmissions, resulting in a decrease in communication rate. Most microwave ovens use 7 to 11 of the 14 channels in the 2.4 GHz band, so for wireless devices using the 802.11b protocol, simply fix the communication channel to 14 (the last channel).
2, the wireless network can not receive data
If everything is normal when the wireless AP is connected to the wireless router, the Internet connection sharing of the wireless network can be realized, indicating that there is no problem with the hardware and settings of the wireless AP. Since the data cannot be received, it indicates that the connection to the network is not properly established, and the cause of the failure may occur in the connection between the wireless AP and the switch. If the switch supports smart ports, you can determine the devices connected to the peer end and automatically complete the port mode switch. Otherwise, you should use the specified jumper to connect the wireless AP to the switch. In general, connections between network devices should use cross lines. Therefore, it is recommended to use a crossover cable to connect the wireless AP to the switch to test whether the fault is resolved.
3, wireless AP cannot connect too many devices
Although in theory, a wireless AP or wireless router can support 256 Wi-Fi connections at the same time. However, from a practical point of view, once more than 10 clients are using the same access point, their performance will quickly diminish. Wireless APs and wireless routers are very similar in some sense to hubs, and bandwidth is shared by all access users. Therefore, as the number of access users increases, the available bandwidth is rapidly reduced, resulting in a significant drop in network transmission rate. In addition, the performance of wireless APs and wireless routing is limited, and the latency will become very large when concurrently handling concurrent access by multiple users. The following methods can be used to solve:
1) Configure a wireless AP, set the two APs to different channels (such as one using channel 1 and one using channel 5), and connect them directly using crossover lines, or interconnect them by means of switches.
2) Lock each NIC to the specified access point. After configuring a wireless AP, it will form a wireless roaming network. The wireless network card roams from one access point to another and then locks on the access point with the strongest signal strength. If there are multiple access points in an environment and there are more than two comparable signal strengths, then the wireless network card will switch back and forth between different access points, greatly reducing network performance. Locking the wireless network card to a fixed access point eliminates the need to switch back and forth between access points; increases security, prevents unauthorized wireless cards from using wireless APs; prevents a wireless AP from connecting too many wireless devices Client.
4. The computer cannot communicate with the wireless network. If the wireless network card displays normal operation, but the data reception and transmission value is 0, the following methods can be adopted:
1) Check all cables of the wireless AP
And make sure the power indicator is green.
2) Verify that all wireless network property settings are correct.
3) Make sure the computer receives a good signal from the access point.
5, the wireless network transmission rate is unstable
If the wireless network is installed, the network communication is basically normal, but the data transmission speed is fast and slow. This is because the wireless devices are closely related to the environment such as distance and interference. They can automatically adjust the speed according to the environment, so the speed change is normal. The simplest, the distance is far, the transmission speed will be reduced. Generally, the wireless access device AP can be placed in the center of the wireless local area network device group so that all wireless terminals are not too far away.
6. Wireless network card display only sends and does not receive
If the wireless AP is set up correctly, other people in the office can receive it via wireless, and the computer can access the Internet through the wired network, but the data received through the wireless network is always 0. Check the wireless network properties and find that the IP address and subnet mask are not normal values. This indicates that the network card is not connected to the wireless network and does not obtain IP address information from the wireless AP.
The cause of the failure is related to the wireless network settings. Different wireless networks use different SSID and WEP encryption. Therefore, the problem may be due to modifications to the network settings. The solution is to refresh and set up the wireless AP and modify the WEP encryption.
7, the notebook can not access the wireless network
Use the SVA wireless AP and wireless network card to build a wireless network. The SVA wireless client can access the wireless network normally, and the built-in wireless network card of the IBM notebook cannot establish a wireless connection.
This is because the default SSID and WEP encryption of the same manufacturer's wireless products are exactly the same, and the SSIDs of different vendors are not the same. Therefore, in addition to Windows XP, other operating systems must install a wireless client and modify the SSID (note the case) and WEP password of the IBM wireless network. It should be noted that the SSID and wireless connection mode of the wireless network card should also be checked in the Device Manager.
8. Low communication rate between wireless APs
The farthest distance of the wireless AP bridge is about 150m, and the two APs often have a connection failure at this distance. It can usually be solved by setting up an external gain antenna, but the cost is higher. Another method is to mount two wireless APs to an outdoor wall, using two walls as reflectors to enhance the front radiated waves. The protection of the basin-shaped container with the aluminum-plastic panel between the wireless AP and the wall surface is both beautiful and solves the problem of waterproofing and sun-proofing, and also plays a good reflection role. The connection rate after processing can be as high as 11Mb/s, and there will be no more dropped lines.
9, the wireless AP location is not right, can not access the Internet
If the company's office building is 6 stories, use two wireless APs, one on the first floor and the third floor respectively. Measures can be taken to place two wireless APs on the second and fourth floors to achieve wireless coverage of the entire office building. Two APs are connected to the switch through a wired network and then connected to the Internet through a broadband router.
10. The wireless signal is weakened after the wireless AP moves.
When the office's functioning wireless AP is moved to the side of the file cabinet, the wireless signal is much weakened and the transmission rate is greatly reduced. The cause of this failure is the multipath (MulTIpath) problem. When watching TV with a horn antenna, some channels have some ghost images on the screen. These ghost images are called multiple channels. Similarly, after the wireless signal is bounced by nearby objects, it arrives at the receiver at different points in time, resulting in multiple paths. For example, put a wireless client in a room and have an access point in this room. When the access point sends a signal, the signal will spread out from all directions and reach the wireless client. But the wireless signal will also bounce off other objects and then travel to the wireless client through the steering path. This means that the wireless client actually received two or more signals. It is almost impossible for a wireless network to eliminate multiple signals, so it is only possible to reduce the multipath phenomenon as much as possible. Try not to place metal objects near the access point or wireless client.
