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Years ago, my employer was light on funds so we cobbled together plugs to use as a loopback when testing and identifying network jacks. It worked great. Insert

Years ago, my employer was light on funds so we cobbled together plugs to use as a loopback when testing and identifying network jacks. It worked great. Insert the plugs in cubilces then test the open ports in the wiring closet. Worked great many times until one day we plugged it in and went to lunch. When we came back, we were told the network had slowed to a crawl and captures showed floods. This was during the days of primitive DoS via broadcast floods. Well, this flood was self induced. The loopback plug was inserted into a jack that had a connection back to the network hub. It dutifully retransmitted everything it saw back onto the network. Whoops.

shyn3 5y ago
Exact same scenario but it was connected to the on premise data center. I was imaging devices and figured why not use a switch and provision 4 at a time. Started seeing everything go down figured the network team was doing things. Checked my images and they had stopped, unplug a cord and everything is working. I don't think anything of it and plug it back in and went back to waiting for the images to deploy but the storm started. After about 5 hours customers started receiving their electricity after the network team found my device.