How to solve the problem of slow transmission speed of LAN

Failure analysis is tied to the following possibilities:

1. Hacker attack or Medium worm virus

2. Line fault

3. Switch overload

4. Network adapter failure

5. Connectivity issues

Troubleshooting methods:

1. Select a few workstations, check its network configuration, correct. Can ping the server, response time <1ms, belong to the normal range, that is, connectivity is not a problem. A windump was installed on one of the computers to obtain the packet, resulting in no problem, eliminating the possibility of hacking or a worm virus.

2. In the elimination of line failures, we know that all computers appear in the network computer transmission speed is slow problem, so the biggest possible only 6 types of wiring pass rate problem. To know whether the wiring problem of the 6 type of line is very simple, as long as a line of 5 lines to replace 6 lines can be, if the network speed of the computer transmission faster, it indicates that 6 types of lines have problems, but the network computer transmission speed is slow, indicating that 6 types of lines have problems this situation is unlikely.

3. To see if the switch overload failure problem, as long as the switch to see if the network computer transmission speed is not faster; but it is useless here, so eliminate the possibility of overloading the switch.

4. Check the network card status of several workstations, found that the network card of these computers are in Half-duplex state. and removed some unused network protocols, the failure is still there.

5. Finally, when you are not able to use the Web management method to log on to the switch, see the error status of each port is not a problem, but accidentally found that each port of the switch is forced to set a full-duplex state; We recall that the workstation's network card is in Half-duplex state, is not the port mode mismatch caused by slow speed, Therefore, the switch port to the adaptive state, the failure to resolve.

(Note: In the case of slow speed, and check no problem, it is best to see if the port mode mismatch caused the problem)