I've been having an issue with the internet at our school for quite some time now and I have not been able to find the cause of the problem.

When a full class (20 users) tries to access the internet, the pages crash and do not load, and the internet becomes extremely slow. This issue has been regular for a couple of months, but was not present before that. When a full class is not using the internet, the internet works brilliantly.

I am trying to find out the source of the problem, and I'm not sure what it can be. At first, I thought it was the switch, as we had a 100Mbps switch, so I swapped that for a Giga switch. I also tried replacing the router for a similar Netgear one and had the same problem. The service provider has said the connection is fine from their side. I also tried using different DNS servers. How can I get to the bottom of this? Are there any tools I can use to diagnose this?

Any help would be much appreciated.






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