Common 23 solutions for slowing down the network speed

The following are common problems that cause the network to be slow, and some common network problems are solved here.

First, the network itself problem

The server you want to connect to is located on the server with insufficient bandwidth or overload. The solution is very simple, please change the time period or change the target website.

Second, the network cable problem causes the network speed to slow down

We know that the twisted pair is tightly twisted together by four pairs of lines according to strict regulations, used to reduce crosstalk and background. The impact of noise. At the same time, only the 1, 2, and 3, and 6 lines of the twisted pair are used in the T568A standard and the T568B standard, where 1, 2 is used for transmission, 3, 6 is used for reception, and 1, 2 must be from a winding. Yes, 3, 6 must come from a pair. Only in this way can crosstalk be avoided to the maximum extent and data transmission is guaranteed. In practice, I found that the network cable that is not made according to the correct standard (T586A, T586B) has great hidden dangers. The performance is as follows: in one case, the network speed is very slow when it is first used; in another case, the network speed is normal, but after a while, the network speed is slow. The latter case is very obvious on a desktop computer, but the network speed is normal when checked with a laptop. For this problem, I have found through many years of practice that the slowdown of the network speed caused by the network cable not produced according to the correct standard is also related to the quality of the network card. Generally, the performance of a network card of a desktop computer is not as good as that of a notebook computer. Therefore, when using the exchange method to troubleshoot, the use of a laptop computer to detect the normal network speed does not preclude the problem that the network cable is not manufactured according to standards. We are now required to press the T586A, T586B standard to suppress the network cable, in the detection of failure can not always use a laptop instead of a desktop computer.

Third, the existence of loops in the network causes the network speed to slow

When the number of nodes involved in the network is not many, the structure is not very complicated, this phenomenon is rarely rare. However, in some more complicated networks, there are often redundant backup lines, such as loops when inadvertently connected. For example, the network cable is connected to the computer room from the network center, and then the computer room is connected to the computer room. At the same time, there is another backup line from the network center directly connected to the second room of the computer. If these lines are connected at the same time, it constitutes a loop, and the data packet will continuously send and verify data, thereby affecting the overall network speed. This situation is difficult to find. In order to avoid this, we must develop good habits when laying the network cable: the network cable is marked with obvious labels, and the place with spare lines should be recorded. When such a failure is suspected, the method of stepwise segmentation is generally adopted.

Fourth, network equipment hardware failure caused by broadcast storms and slow network speed

As the main means of discovering unknown devices, broadcasting plays a very important role in the network. However, as the number of computers in the network increases, the number of broadcast packets will increase dramatically. When the number of broadcast packets reaches 30%, the transmission efficiency of the network will be significantly reduced. When the network card or network device is damaged, the broadcast packet will be sent continuously, which will cause a broadcast storm and paralyze the network communication. Therefore, when the network device hardware is faulty, the network speed will also be slowed down. When such a failure is suspected, the replacement method can be used to replace the hub or switch to eliminate the fault of the hub device. If these devices are not faulty, after turning off the power of the hub or switch, use the “Ping” command in DOS to test the computers involved one by one, find the computer with the faulty network card, and replace the new network card to restore the network speed. NICs, hubs, and switches are the most prone to failures that cause slower network speeds.

V. A port in the network has formed a bottleneck and the network speed is slower.

In fact, the router WAN port and LAN port, switch port, hub port and server network card may become networks. bottleneck. When the network speed is slow, we can use the network management software to check the data traffic of routers, switches, and server ports during peak network usage. Netstat commands can also be used to collect data traffic of each port. Based on this, confirm the location of the network data flow bottleneck and try to increase its bandwidth. There are many specific methods, such as replacing the server network card with 100M or 1000M, installing multiple network cards, dividing multiple VLANs, changing router configuration to increase bandwidth, etc., all of which can effectively alleviate network bottlenecks and maximize data transmission speed.

Sixth, the impact of worms causes the network speed to slow

The worm spread by E-mail has an increasingly serious impact on network speed and is extremely harmful. The virus causes the infected user to send emails as long as they are on the Internet. The virus selects a random document in the user's personal computer and attaches it to the random address of the user's address book for mail transmission. Hundreds of such spam messages were sent out in teams, and some were returned in batches in batches on the server. As a result, the individual backbone Internet has obvious congestion, and the network speed has become significantly slower, making the local area network close to the embarrassment. Therefore, we must upgrade the anti-virus software used in time; the computer should also be upgraded in time, install system patches, uninstall unnecessary services, and close unnecessary ports to improve system security and reliability.

VII, excessive use of the firewall

The excessive use of the firewall can also cause the network speed to slow down, the handling method need not say more, uninstall the unnecessary firewall only retains a powerful sufficient.

Eight, insufficient system resources

You may have loaded too many applications running in the background, please load the software reasonably or delete useless programs and files, free resources to reach Improve the speed of the network.

IX, the system reserves broadband

The professional version of Windows XP retains 20% of the bandwidth by default, in fact, this does not have much effect for our individual users. Instead of being idle, use it as follows: Enter gpedit in Start → Run. Msc, open the Group Policy Editor. Locate "Computer Configuration → Administrative Templates → Network → QoS Packet Scheduler", select "Limitable Retainable Bandwidth" on the right, select "Properties" to open the Restricted Bandwidth Properties dialog box, select "Enable", and change the value. Is 0. After this reset, you can release the reserved 20% of the bandwidth.

Ten, too many protocols for network card binding

This situation is very common among LAN users. If there are many protocols bound to the network card, when the data passes through the network card, the computer will spend a lot of time to determine which protocol to use for the data to transmit, and the user will feel slow. The solution is: use a network card to bind only the PPPoE protocol to connect to ADSL, provide external connection for the Internet, and use another network card to bind other protocols of the LAN, so as to perform their duties and improve performance, so that the client's Internet access speed will increase. .

XI, ADSL equipment heat dissipation

ADSL equipment work when the heat is relatively large, usually pay attention to heat. Many users put ADSL equipment and routers, hubs, etc. in a cabinet, which is not conducive to heat dissipation and has an impact on the normal operation of ADSL. ADSL and other equipment should not be placed in the cabinet. They should be placed separately. There should be ventilation and heat dissipation channels between the equipment. The equipment room should be kept at a constant temperature. The general ambient temperature should be controlled at 10-30 °C.

Twelve, access to the Internet interface error

This is caused by the Internet connection wizard of the Windows system to the IE specified access to the Internet interface error. EnterNet 300 (virtual dialing software) uses LAN type virtual dialing, while IE uses normal dialing by default. When browsing, IE first looks for the dial-up interface. If you can't find the dial-up, you can find the proxy server in the LAN. Finally, you will find the interface of EnterNet 300, so it will be very slow. Just re-run the Internet Connection Wizard, select the LAN mode, and cancel the automatic search proxy server to solve.

Thirteen, can not bind TCP /IP protocol

Can not bind TCP /IP mostly for the network card driver is not properly installed, network card quality problems and PCI slot is bad. The NIC driver in the device manager should be deleted first, and the driver should be installed after rebooting; if it is not good, then change the NIC to a PCI slot; it is still not good to change a NIC.

XIV. Poor quality of telephone lines

ADSL technology requires high quality of telephone lines. The current ADSL is a kind of RADSL (rate adaptive DSL). If the telephone line between the telecommunication office and the user is interfered by external factors for a certain period of time, RADSL will dynamically adjust the access speed of the user according to the quality of the line and the distance of the transmission distance. If you are visiting a foreign site, the speed will be affected by factors such as the export bandwidth and the route of the other site and the configuration of the device. The line problem mainly includes the quality hazard left by the construction standard when the construction is not followed. If the plastic casing is not added, the mouse bites the line; the patch panel or other material quality problems cause the jumper to be in poor contact; the user is darkly covered during the decoration. Line damage, etc.

Fifteen, QQ can't connect to the network?

Need to make some settings for it. Select the "System Parameters" command from the QQ panel, click the "Network Settings" tab, and change the original "Dial-up Internet" to "LAN Access to the Internet".

XVI, computer hardware software problems

Hardware failure is mainly manifested in bad or not properly installed network card; the computer motherboard and network card are not compatible; low computer configuration, especially low memory, resulting in slow operation. The software failure is mainly due to the user not knowing the computer knowledge, misuse during the use process, resulting in operating system error or damage to the dial-up software and unable to access the Internet; after the user browses some web pages, the system has problems, and the backup dial-up software is accidentally handled during processing. Deleted; after the computer reinstalled the system, no dial-up software was installed. These software failures can be eliminated by simply reinstalling the dial-up software.

Seventeen, a website can not open for a long time?

The reason is that during the peak period of the Internet, many users visit the same hotspot website, because the website server can't handle it, or the bandwidth If the network speed is slow and the webpage cannot be opened for a long time, please avoid going online during the peak hours or changing to other sites.

18, due to Internet node failure

The network system automatically performs routing and routing, resulting in slow network speed. Please be patient and wait for the system to recover.

XIX. Due to the quality problems of "cats", the Internet speed is slow. Please replace the quality "cat".

Twenty, the electrical indicators of the telephone line are too low, causing the Internet to be slow, please replace the high-quality line.

Twenty-one, the connection rate between the "cat" and the host is low, and the Internet speed is slow. Please re-set the interface parameters.

Twenty-two, running an advanced operating system on a low-end machine, causing slow Internet access, please re-select the operating system and browser for your computer.

Twenty-three, due to improper settings of the browser, the Internet speed is slow, please reset the number of days of webpage retention, set the browser's cache directory to the hard disk with the highest transfer rate, and increase it appropriately. capacity.

At present, most dial-up users use Windows systems. Many times they hear users complaining about slow Internet access, but we found that there is a situation: when it is slow, it is actually disconnected. However, the icon of the Internet still exists at this time, which creates the illusion of still surfing the Internet. If you have a phone around you to pick up the phone to identify, you can also drag the mouse to the icon on the Internet, right click and select "Status" to see if you have received the data, such as if no data has been received for a period of time. The line has been disconnected and can only be redialed.