What Is Bandwidth Throttling?

Generally refers to the speed limit for uploading and downloading when you use the computer / mobile phone to access the Internet. The speed limit is to limit your bandwidth transmission rate, the uplink rate is the rate at which you access the browser, and the downlink rate is the download rate.

Internet speed limit

First, caused by the virus

This situation often manifests when opening IE, in the lower left box of the IE interface, it prompts: The web page is being opened, but it does not respond for a long time. Check the process in the task manager, (enter the method, put the mouse on the taskbar, right-click-task manager-process) to see how the CPU usage rate, if it is 100%, it is certain that it is infected with a virus, At this time you want to run other programs is simply suffering. This is to find out which process is greedily taking up CPU resources.

After you find it, it is best to record the name, and then click End. If you can't end, you need to start in safe mode to delete the Dongdong, and also enter the registry, (Method: Start-Run, enter regedit) in the registration In the table dialog box, click Edit-Find, enter the name of the program, find it, right-click to delete it, and then perform several searches, which can often delete it completely. There are many viruses, and when antivirus software is powerless, the only way is to remove them manually.

Related to setting up a proxy server

For some packages, for some reasons, a proxy server is set in the browser (Control Panel-Internet Options-Connections-LAN Settings-Use a proxy server for the LAN). Setting a proxy server does not affect QQ networking, because QQ The port 4000 is used, and the port 80 or 8080 is used to access the Internet. This is why many people do nt understand why QQ can be uploaded and the webpage cannot be opened. The proxy server is generally not very stable, sometimes it can be used, sometimes it can't. If so, please cancel the proxy.

DNS server interpretation error

The so-called DNS, or Domain Name Server, translates domain names into IP addresses that computers can recognize, such as the window of Shenzhen. The corresponding IP address is 219.133.46.54, and the corresponding IP address of the Shenzhen hotline is 202.96.154.6. If there is an error in the DNS server, the domain name cannot be interpreted and the Internet cannot be accessed.

If this is the case, sometimes it is the problem of the network service access provider, that is, the ISP, you can call to consult the ISP; sometimes it is the problem of the router or network card that cannot connect with the ISP's DNS service.

In this case, you can turn the router off and on again, or reset the router. Or the network card cannot automatically find the DNS server address, you can try to use the specified DNS server address. In the properties of the network, (Control Panel-Network and Dial-up Connection-Local Connection-Right-click Properties-TCP / IP Protocol-Properties-Use the following DNS server address). Different ISPs have different DNS addresses, such as 202.96.134.133 (primary) and 202.96.128.68 (spare) commonly used by telecommunications. It's also a good idea to update the driver of the network card or replace the network card.

IE optimization

The interface optimization of IE is basically the same as that of the explorer, which reduces the function bar as much as possible, leaving only the address bar. However, there are many fun things in the tools-internet option. Normal-blank pages for the homepage that can be changed, no need to load any webpage when opening, fast speed-multimedia, remove "Enable automatic image resizing", directly display the entire image, reduce the workload of IE. Browse and remove "Enable offline items to synchronize according to plan". What is the use of offline when broadband subscriptions are so popular today? Remove "Use smooth scrolling" and let the left navigation bar to quickly turn pages in the normal page up / down mode. Remove "Send notification after download is complete", it will do more if you still notice anything after download. Remove the "show go button in the address bar", we are not very useful. Remove "Automatically check for Internet Explorer updates". Manual updates are always faster than automatic updates, and you don't need to keep IE constantly aware of whether updates are needed.

Xiao Wang is a network administrator of a unit. The unit has recently leased an exclusive 10MB broadband optical fiber line from the local telecommunications department, enabling the unit's local area network to directly connect to the Internet. In the beginning, no matter which workstation on the local area network was used to access web content or download information, the speed was very fast; however, with the gradual expansion of the unit size, the number of workstations in each department is increasing, plus some Unconscious employees use professional tools such as BT to download movies or video information at random during work, making the Internet speed of the entire unit's LAN very slow, and often the embarrassing phenomenon of waiting for a few minutes to open a simple web page often occurs. Unit leaders attached great importance to this phenomenon, and asked Xiao Wang, who is a network administrator, to quickly take measures to resolve the phenomenon that the unit's LAN speed is slow.

Generally speaking, there are only two main methods to improve the access speed of broadband networks. One method is to increase the size of the exit bandwidth of the LAN network so that the Internet access channel can cope with the work access requirements for greater traffic. The other method is to maintain the existing network. The bandwidth is set from the internal optimization of the local area network to improve the network's exit access efficiency. Because expanding the capacity of the exit bandwidth requires the unit to pay a higher communication fee, it is clear that this method does not have much practical significance, so Xiao Wang decided to use the second solution to properly optimize the unit LAN network. Considering that the Internet access speed of the LAN has dropped, it is mainly caused by employees' unconscious use of professional tools such as BT to download large-capacity information, and P2P download applications are often difficult to directly block and block. Therefore, the network administrator Xiao Wang went online After searching for relevant materials, and after much deliberation, it was decided to adopt a method of limiting the bandwidth for each workstation user in the LAN to ensure that the limited exit bandwidth resources of the unit LAN are not exhausted.

Under normal circumstances, when limiting the Internet bandwidth of a LAN workstation, we have two options. One option is to install a professional network management tool, SyGate, in the proxy server of the LAN. With the help of this professional tool, we can The maximum transmission speed of different subnets in the local area network is limited or specified. It is also possible to set a speed limit for a workstation with a specific IP address. Another option is to directly limit the transmission speed of a specific switching port in a manageable switch. Considering that the workstations in the local area network are scattered and installed at different locations in many different departments, experts from My Network think that if a proxy server is directly configured to limit the workstation's Internet bandwidth, not only is the cost higher, but all workstations in the LAN pass through the proxy server When transferring to the Internet, the proxy server will face considerable traffic pressure, and the LAN speed of the LAN will not be substantially improved. After repeated considerations, the network administrator Xiao Wang decided to use the manageable function of the unit LAN switch to connect the switch to the port. The speed is limited to achieve the purpose of restricting employees to use BT tools at will to illegally consume Internet bandwidth resources.

After repeated consideration and selection of the specific implementation plan, the network administrator Xiao Wang decided to start limiting the Internet access speed of the LAN. Because Xiao Wang has a network topology structure diagram of the unit LAN, through careful comparison of the drawings, Xiao Wang quickly figured out which subnet or workstation in the LAN corresponds to which switching port in the unit core switch; After pinpointing the target, Xiao Wang immediately entered the background management interface of the switch with system administrator rights, and used the bandwidth command of the switch system to properly limit the maximum transmission speed of each switching port. For example, if workstation A in the LAN is connected to port 2 of the switch, we now hope that the maximum transmission speed of port 2 of the switch can only be limited to less than 2MB; to achieve this speed limit, we can first enter Go to the background management interface of the switch, and then enter the configuration mode of port 2 and enter the string command "bandwidth 2000" in the command line in this state. After you press Enter, the maximum transmission speed of port 2 of the switch will be changed. If the limit is less than 2MB, then the maximum speed of workstation A connected to this port when accessing the Internet will not exceed 2MB. Here, we need to remind you that the unit used for "2000" here is KB. 2000KB is actually 2MB. In the same way, we can appropriately limit the connection speed of other subnets in the local area network or the Internet access speed of other workstations. In this way, the bandwidth resources of the entire unit's LAN exit will not be occupied by a particular subnet or a workstation "Occupy", then the Internet speed of the LAN is guaranteed.

When the number of workstations is not large, setting the switch ports one by one can indeed quickly limit the Internet speed of the workstations. However, with the gradual expansion of the LAN of the unit, if we still adopt the sequential setting of a single switching port, the workload of the network administrator will be very large, and it will not be conducive to improving the efficiency of LAN maintenance. Consider this , The network administrator Xiao Wang decided to put all workstations in the same department into the same virtual subnet, so that workstations in different departments are basically located in different virtual subnets, and then Xiao Wang pairs the switches connected to the virtual subnet. Internet speed limit on the port. For example, if we want the maximum transmission speed of virtual subnet 1 to be 2MB, then we only need to enter the switch background management interface as the system administrator, and then enter the configuration mode state of virtual subnet 1 and stay in this state. Enter the string command "bandwidth 2000" in the command line of the command line. After you press the Enter key, the maximum transmission speed of the port connected to the virtual subnet 1 in the switch will be limited to less than 2MB. The maximum speed when accessing will not exceed 2MB.

By limiting the speed of the switch port connected to the virtual subnet or workstation, we can very easily limit the LAN exit speed of the entire unit, so as to ensure that limited bandwidth resources will not be used up by very few users. This speed limit solution does not need to add any new equipment, no new costs, and does not need to adjust the existing network topology of the local area network. Therefore, this solution is used cleverly to limit the speed of the LAN workstations. It can quickly solve the problem that the overall Internet speed of the local area network is slow. Of course, for larger enterprise LANs, this solution still has some regrets; but at present, this solution is still very suitable for small and medium-sized enterprise LANs!