Shulou(Shulou.com)06/01 Report--

The following network failure occurred in this school.

Network topology diagram:

The school is connected to the education network and Unicom at the same time, and the gateway of the computer is on the core switch.

Information provided by users: Internet access sometimes pauses, PING extranet URLs or firewall gateways sometimes packet loss, sometimes very slow.

Preliminary judgment: This problem requires logging on to the firewall to look at the logs and configurations to further determine where the problem exists.

Log in firewall found a lot of up,down information on the external network port, which happens almost every hour recently. The problem first occurred three months ago.

Ask the user if the network has changed at that point in time, and the answer is yes. The photoelectric converter was replaced with a new one.

Then continue to observe for two or three hours, found that this problem continues to exist, network traffic is not large, should not be caused by large traffic. Replace the external network port with another physical port of the firewall, and the problem continues.

Let the user connect the firewall external network port to a computer, and then PING this computer from the intranet. There is no firewall interface up,down within 1.5 hours.

Let the user change a photoelectric converter to try, after changing everything is normal.

In the process of replacement, users are skeptical, and this photoelectric converter is provided by Unicom, which is extremely reluctant to replace it. Finally tell users that photoelectric converters are cheap and easy to handle. If it is a firewall problem, I will try to deal with the firewall problem for you as soon as possible. End users insist on replacement of photoelectric converters by Unicom.

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