Analysis of common faults in network maintenance
What is the most embarrassing situation in the process of surfing the Internet? I think it is a sudden drop, and everything that is going on has to come back again. It’s really maddening. Since the home is online, if you encounter frequent offline calls, it will affect your mood very much. Therefore, the author has prepared for the first time. A list of dozens of common situations that can easily lead to dropped calls, you can check the number of your own network, and it is worthwhile to prepare in advance for the smooth network.
1, poor heat dissipation
Now that it is summer, you should first consider the heat dissipation problem of the wireless router. When the wireless product works, it will inevitably generate a certain amount of heat. Therefore, whether the heat can be timely is an important indicator for the quality inspection of wireless products. This is related to the design structure of wireless products. Working power, heat dissipation characteristics, and heat dissipation materials are closely related.
Some wireless products use a lot of materials and structures with poor heat dissipation because of the one-sided pursuit of beauty and low cost. This will cause wireless products to overheat for a long time, which will affect the connection speed and even damage the hardware.
Therefore, users should pay attention to selecting brands that are produced by Dachang and have good quality assurance when purchasing wireless products. They should not pursue low prices on one side, and pay attention not to stack them on the placement of products, and try to choose places with good ventilation. .
2, the load is too large
Although in theory, a wireless router can load 254 computers in a WLAN at the same time, but the current hardware performance of most home wireless routers, the optimal load is generally about 3 to 5 units. If there are too many computers connected, and the network application of each machine user is relatively frequent, it is likely that the wireless router will not be able to do so and frequently drop the line.
In response to this problem, in the process of product purchase, users should pay attention to their number of connected machines. Currently, APs on the market are basically divided into two types: simple APs and extended APs. In addition to the basic AP functions, the extended AP may also have several functions such as Ethernet switch port, routing, NAT, DHCP, and printer server. If you consider the number of accesses alone, there are still more simple AP accesses. If the number of accesses is large, the AP's burden will be too large, causing the situation of dropped calls.
3. Exceeding coverage
The wireless network card is too far away from the wireless AP or the wireless router, and exceeds the coverage of the wireless network. When the wireless signal reaches the wireless network card, it is already very weak, so that the wireless client cannot perform normal connection.
Today's wireless devices are nominally indoor 50M outdoor 300M, but this is only an ideal state, which is often not achieved in practical practical applications. Therefore, for users with a large home area, consider installing an external antenna for the wireless AP or wireless network card. To enhance the strength of wireless signals and extend the coverage of wireless networks.
4, signal interference
The distance between wireless devices is too far or there are many obstacles, which causes poor wireless signals, which is also an important cause of dropped calls. In this regard, you can check the strength of the wireless signal in the system. If it is found to be too low, you can adjust the antenna or device position and angle to see if the signal is improved. If necessary, you can move the computer to avoid some metal obstructions, especially Reinforced concrete walls that have a great impact on wireless transmission. If there is no improvement, the user needs to transmit wirelessly over a long distance. It can be solved by using a high-gain antenna, such as replacing the 1~2dBi antenna that is standard on most devices with the 3-8dBi antenna.
5, the device is not compatible
Everyone usually thinks that wireless AP is more important, so it is very important in the choice, and the attention of the other end of the receiving device - wireless network card is generally reduced. In fact, the wireless network card on the market is varied, both famous brands and Bulk workers, and wireless APs also have a large number of brands, after the purchase, the compatibility between the equipment and the equipment will inevitably have problems.
When purchasing a wireless network card, we should proceed from our own actual situation. Notebook users should be able to choose PCMCIA types of network cards, which have excellent performance in terms of signal quality and compatibility. Some desktop users can choose USB. Type of network card, you should pay attention to the location problem when using it. If you put the USB wireless network card in the back of the chassis, the signal may be affected, and use the included USB extension cable to place the wireless network card on the desktop or higher. The local effect will be very good.
6, hybrid wireless network
In theory, the IEEE 802.11n protocol is backward compatible with the 802.11b/g/a protocol. However, it should be noted that if there is a network card using the IEEE 802.11g protocol in the network, the connection speed of the entire network will be Dropped to 54Mb/s (the transmission speed of the IEEE 802.11g protocol).
Therefore, when users mix wireless devices such as IEEE 802.11n and IEEE 802.11g, they must set the wireless AP to the hybrid (MIXED) mode. With this mode, several modes can be compatible at the same time.
7, the IP address is wrong
If the IP address of the wireless AP or the wireless router has been assigned, and the IP address manually set by the user and the IP address of the wireless AP are not in the same network segment, both of these situations will cause the wireless network to drop frequently.
At this time, you can solve this problem by increasing the address range of the wireless AP or wireless router, or setting the correct IP address for the wireless network card to ensure that it is in the same network segment as the wireless AP's IP address.
8, the network environment changes
When the network environment used changes, such as when you return home from the office, forget to change the SSID configuration or the IP address is not automatically assigned, you will find that you cannot connect to the wireless network.
In this case, the user needs to be careful. When accessing the new wireless network, the client's SSID setting is changed in time; and the IP address automatically assigned by the wireless AP is used by default. If you want to use a static IP address, you must ensure that the static IP address and the IP address of the wireless AP are on the same network segment.
9, MAC address filtering
If the network administrator sets MAC address filtering for the wireless AP, only the specified MAC address is allowed to access the wireless network, and the unauthorized users are rejected to ensure the security of the wireless network. In this case, you need to contact the administrator to add the MAC address of your wireless network card to the list of allowed MAC addresses.
10, bandwidth is occupied
Of course, you can't ignore the drop caused by P2P download software such as BT. Fake your wireless network is a shared wireless LAN with multiple people. You need to find out whether there are users in the network who are doing high-bandwidth Internet applications such as BT download during the offline period. If yes, it is recommended that the user reduce such applications during the peak hours of the Internet or manually set the software speed limit to limit the bandwidth usage to achieve the average bandwidth allocation.
11, the driver BUG
The wireless router's firmware (firmware, also known as firmware) has a bug, or the wireless network card driver has compatibility problems, which may cause the wireless network to drop the cable for unknown reasons. The best solution is to update the firmware of the wireless router, and to download the latest driver update from the Internet to download the wireless network card (replace the operating system if necessary).
12, put a small tip
First, shorten the distance between the wireless network card device and the wireless AP as much as possible, minimize the obstacles between them, or use the antenna properly to effectively enhance the coverage of the wireless network.
Secondly, let microwave ovens, Bluetooth devices, wireless speakers and mobile phones capable of wireless Internet access be away from wireless AP devices or wireless routers, because these devices will interfere with the working stability of wireless APs or wireless routers when working, resulting in frequent wireless networks. Dropped cable failure. In addition, some devices may work at the same frequency as wireless APs or wireless routers. At this time, mutual interference may occur between them, which may cause a wireless network to be dropped.
Therefore, before we can make a wireless network connection, we must check whether there are any interference sources nearby. If we find these interference sources, we must remove them in time. If we encounter special phenomena with the same working frequency, we may wish to enter the wireless AP or wireless. The background management interface of the router, and adjust their working frequency in it to eliminate the influence of mutual interference.
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