Packet loss due to CPU failure?

That's a strange question! Haven't touched it.

In the face of this network failure, many network administrators will use the ping command to test the network connectivity, and the test results show that the data packet loss phenomenon of the network transmission line at this time is very serious, so what factors cause the data packet loss phenomenon to be more serious? Is the connection line contact unstable? Is it a cyber virus?

Or is it something else? After carefully summarizing this kind of phenomenon, we found that the factor that is most likely to cause data packet loss is the network loop, after all, in a slightly larger LAN environment, the network administrator is easy to connect the ports between the switches incorrectly, thus causing the network loop phenomenon, and this phenomenon has a relatively strong concealment, if we are not careful when eliminating this kind of fault, it is easy to take more detours! In order to help you efficiently solve network failures such as serious data packet loss, the author will now contribute a network loop troubleshooting process that I have encountered, and I hope you can benefit from it!

Fault phenomenon: The topology used in the LAN network of the author's unit is a star-type 100 Gigabit Ethernet structure, a Cisco brand Layer 3 routing switch is used as the core switch of the network in the LAN host room, each floor of the five-story building of the unit has a subnet segment, all workstations in each network segment use the ordinary switch of the D-Link brand as the hub equipment, and the ordinary switch in each floor is directly connected to the core switch in the host room through twisted pair cables. And through the core switch direct access to the Internet network.

Multiple servers are installed and configured in the local area network of the organization at the same time, such as a file server that stores important data information of the organization, a web server that provides external web access services, and an FTP server that provides important information. In normal times, all workstations in each subnetwork segment of the organization can access the Internet network normally, and workstations in each subnetwork segment can also access each other. However, one day, users in a certain subnetwork segment reported to the author through their mobile phones that when the subnet workstations they were in accessed the Internet network, sometimes it was normal and sometimes abnormal, and when the workstations in the same subnetwork segment pinged each other, it was found that the data packet loss was very serious. I thought that this kind of fault was only a very rare phenomenon, but who would have thought that it would not take long for many users distributed in multiple network segments to report the situation to the author one after another, and the fault phenomenon described is basically the same.

Continuous fault call for help makes the author can no longer sit still, the author immediately set off to one of the floors, the workstation in the network segment to test the Internet, in the process of surfing the Internet, the author found that the web page opening speed is sometimes very slow, a few minutes can not open a page, sometimes the speed is very fast, as long as the address is entered and hit the enter key, the content of the web page is immediately displayed, and this phenomenon repeatedly.

It is not difficult to find that many network administrators have encountered this problem, the speed of uploading or ** text files to the server is OK, if you transmit some large capacity of more ** information to the server, the speed is very slow, as an Internet café hotspot, this is usually a serious data drop failure problem in Internet cafes. The network administrator tried to perform a ping command test on the server and a ping command test on the server, and the test results found that there was no packet delay and no data packet drop, and the test results were normal. Then the network administrator conducted a ping command test operation in the old computer with a 10M network card installed, and the test results turned out to be normal, and the computer that failed happened to be some new workstations with a 100M network card installed.

The network administrator has repeatedly analyzed this phenomenon to see if there is a matching problem between the transmission speed of the network card of the workstation and the transmission speed of the switch. The network administrator then forced the transmission speed of the 100M network card device to 10M in those faulty computers, and then conducted an access test, and found that the fault phenomenon was actually gone, and it was obvious that the above fault was indeed caused by the speed mismatch. When we encounter the same fault phenomenon, we might as well carefully check whether the transmission speed of the faulty workstation and the switch match, if not, we only need to forcibly modify the transmission speed of the NIC device in the faulty workstation to ensure that the working speed of the NIC device and the switch are matched.

Serious packet loss of data causes the network to be unusable, especially for online game players, which is very slow. The method of solving the serious packet drop fault in the LAN of the Internet café is introduced here, I hope it will be helpful to you.