Network neighbor is not equal to network card normal

Several TCL-branded PC machines in the school classroom are more than four years old): the main board is integrated with network cards, video cards, sound cards, and the operating system is Windows 98. Recently, a strange network fault has emerged: if you can access a computer in a neighboring network but cannot access the Internet through the proxy server, the proxy server uses the IP address specified by winmtr 5.23 to access the Internet.) When you open the IE browser and enter the website addresses, the browser displays the "this page cannot be displayed, the page you want to view is currently unavailable. ......" Or occasionally, you can access the home pages of major portals, but other computers of the same type in the classroom can access the Internet normally.
These computers can access all the computers in the network's neighbors, which indicates that the network connection is certainly correct. I tried to change the IP addresses of these computers and clear the Cache and logs in the proxy server Wingate. The fault still persists. At that time, I thought it was probably because there was a problem with IE or a virus in the system? I immediately upgraded IE from 5.0 to 6.0 and installed patches. After the restart, I started IE and still couldn't access the internet. I used the latest KV3000 and rising 2005 to eliminate viruses. Is there a problem with Windows 98? First test one of them: After the registry is repaired and SFC is run, the fault still exists. There is no way to try cloning: After cloning the system of a normal computer, I did not expect the fault to remain the same. The last hard drive re-partitioning thoroughly reinstalls Windows 98, which is still the same fault. This is really a problem with the hacker.
The system is normal, the network connection is normal, and the proxy server is normal, but these computers cannot access the Internet normally, while other computers of the same type are normal. Can't you find the root cause of the problem? I suddenly wanted to try it with the ping command to see if I could find some trace ......, Ping 192.168.1.2 proxy server address) No problem. Try to ping 192.168.1.2-l 65500 but find the problem. Four Request times out in a row, the packet loss rate reaches 100%, and then the Sent bytes value is gradually reduced, finally, we found that, whether these computers are pinged to other computers or other computers, the packet loss rate of Sent over 1500 bytes is 100%. Then, replace the ports of these computers on the vswitch and restart the vswitch to test whether the packet loss rate of Sent over 1500 bytes is also higher than 100%. Vrouters are not used in the network. This network fault must be caused by the aging of the NIC integrated with the motherboard. A new D-Link DEF530TX Nic is installed immediately, DISABLE the onboard network block in COMS. After Entering Windows 98, install the D-Link DEF530TX NIC Driver and set it. Then run the ping 192.168.1.2-l 65500 test. Everything is normal, and can also access the Internet normally. After the new Nic is installed on the remaining computers, the problem is solved.

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