The author's unit set up the company's internal LAN last year because of work needs. Because I know some computer and network technology, I was appointed as a part-time network manager by the company's leadership, although the company's leadership is mainly due to this. The purpose of saving capital is that I can get the approval of the leader. I feel quite complacent over a period of time. It is only after the establishment of the local area network that there has been no problem, so I have no chance to show my skills. After a while, everyone seems to have forgotten the existence of my network administrator (part time).
One day, the network has been blocked for many times, and this phenomenon has appeared for several consecutive days, which has brought a lot of trouble to the company's work and seriously affected the work efficiency. At this time, the company's leaders and colleagues finally remembered that I had this network administrator. Everyone asked me to troubleshoot as soon as possible to ensure the normal work of the company.
Finally, there is a chance to show your face. Although you can't get a salary for part-time job, Bijing will let me have the attention of the leader. If there is a laid-off "opportunity", then this special leader will definitely not give priority. I am. Gossip less, let's work hard!
First open the management information base of the router, that is, the MIB library, during working hours. The information on the MIB library shows that the average traffic of the network does not exceed 50%, and only a small part of the data collision occurs, which indicates that most of the devices in the current network structure It is intact and the fault may be caused by a workstation. In order to accurately understand the fault point, the network multimeter was found to be connected to the network for testing. When the network was blocked, the network traffic measured by the network multimeter was very high, reaching 80% or more, and the data frames in which the collision occurred accounted for the vast majority. After questioning, it was found that half of the workstations received or sent data during the blockage. Three of the workstations were in the state of data transmission and reception during the network congestion. It seems that the problem is likely to occur on these three workstations. The packet traffic during the network congestion test and analysis shows that the data packet traffic of one workstation is large and outrageous, and the competition is more than ten times the sum of the traffic of other workstations. The root of the fault should be on this workstation.
The following work is to determine the location of this workstation in the LAN, by opening the backup of the MAC address of each workstation's network card, and looking up the MAC address found in the network multimeter, the location and user of the suspected workstation are identified. .
Next, when I visited the suspected workstation, I found a strange phenomenon. When the network was blocked, the workstation user did not use the computer, and connected the network tester to the workstation network card. It seemed to send traffic and found data collision. It has increased dramatically with the increase in traffic. From the above phenomenon, it can be judged that there is a fault in the connection of the network card, and then the network card and the network cable of the workstation are tested. The result shows that the currently used crystal heads are of three types instead of five types, so that the crosstalk at the near end of the link is more than the difference.
After talking with the users of this workstation, the user of this workstation lacks certain network common sense. In the case of damaged crystal head, I just found a three-type crystal head and then downloaded some compression on the Internet. Dynamic files that can be transferred in real time over the network. When the user decompresses the downloaded dynamic file and sends it to other users, the traffic of the network packet will increase sharply, so that the packet will be lost during transmission, and the data will be retransmitted repeatedly, because all the LANs are The workstation is in a network segment, and the working status of one workstation affects the transmission quality of the entire network, causing the entire network to be blocked.
The fault is eliminated. The praise of the leader's praise of the colleague is indispensable. The key is that this troubleshooting has gained a lot of experience.