I have a k12 school network giving me fits. All user connections will drop off multiple times a day. The outages only last between 18-22 seconds, about 4-6 request timed outs (very consistently). The servers are all in one switch, and never lose connection to each other. All users eventually connect to a single switch upstream from the server switch (no errors on any managed switches). I believe it is a bad device or faulty port on a switch somewhere causing the problem. Increased network activity triggers the outages. The failures come about the time 30 + users login, and occasionally after that (16 times yesterday). I isolated a comp lab, in hopes of verifying it was causing or contributing to the problem. Ntop shows the network is only running at 5% load. The outages are very random, and so brief, that I have not been able to run anything like wireshark, etc.., to help identify the problem. There are a ton of unmanaged 5-8 port switches in the building, which complicates things further. Is there something I can run, or do that will help figure out what is going on here?