Given the changes, I would not think a denial-of-service attack is likely. macOS Windows 10 Windows 11 Important For Windows 11 devices, there is an issue between the Windows 11 client and the Windows VPNv2 CSP. If a node is not behind the firewall, is it fast? Is the Sonicwall firewall meant for the bandwidth that you are putting through it? Are people using streaming video from the Internet? There are multiple potential causes. Are they flashing green or amber? Are they solid red? Each port has two lights. I would look at lights in the back of individual ports on routers. It would be interesting to see if stateful packet inspection or an intrusion detection system is slowing down performance. You could compare the speed test results in Windows machines to Mac machines. You may want to use to see if everything behind the firewall is slow. I would try to identify which nodes have the best Internet performance. Collisions can cause serious performance problems. Looking at individual devices (hubs, wireless routers, or firewalls) with Cacti can help. Can you deploy configure Cacti? Solar Winds is another network monitoring device that could help you visualize traffic and potentially pinpoint the problem.
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