On Mon, Dec 17, 2012 at 8:24 AM, Raymond Norton <admin at lctn.org> wrote: > What is the best tool to use for diagnostics? Well, sounds like a job for wireshark (packet capture). Alternatively, you can use tcpdump to capture (something like this will write captured packets out to packet.log: $ tcpdump -w packet.log). Once you have a capture, you're going to need to know what to look for, which is something of an art. If you have a loop in your network, you'll likely see thousands and thousands of broadcast messages. During typical network traffic, broadcast packets only account for a small percentage of total traffic, but during a broadcast storm, these packets will comprise the vast majority of packets you'll see. Bummer that your switches are web-only, but hopefully you'll still be able to get some good data out of them. Look for port errors, link up/down messages, etc. Try and narrow down the issue to a certain time, a certain combination of client/server connections, etc. -Erik