Example: After being infected by a virus, the IPC in the LAN suddenly cannot access the Internet.
Reason analysis: After understanding the relevant situation, when the customer is unable to access the Internet, it is found that if an industrial computer is disconnected during the period, other industrial computers can access the Internet: but as long as the network of this industrial computer is connected, then other industrial computers cannot access the Internet. According to the analysis of the fault phenomenon, the fault may be related to this industrial computer. The main causes of the problem are as follows:
First, viral infection.
Second, the wire contact is poor.
Third, there is a problem with the network protocol.
Fourth, the system file is corrupted.
Fifth, the wire is damaged.
Sixth, there is a problem with the network card.
Seventh, there is a problem with the network settings.
(IPC)
Treatment: Regarding this problem, first check the problem of the network cable, and then check the virus, protocol and other reasons. The repair steps for this defect are as follows:
The first step is to connect the network cable of the faulty industrial computer to other industrial computers for online testing. If it is found that the network cable of the faulty industrial computer can be connected to the Internet, it is indicated that the network cable of the faulty industrial computer and its connection are normal.
The second step is to pay attention to the problems of the industrial computer itself. Antivirus software is then used to detect and kill the virus. As a result, the ARP virus was found on the IPC that presented the problem.
The third step is to test the connection line after the virus is cleared, and find that the network can visit normally, and eliminate the problem.
Lesson learned: For the situation that the industrial computer cannot access the Internet on the local area network, the cause of the virus is also an important aspect. If you admit that the network cable, network card and other equipment are normal, you can rule out the cause of the virus first.
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