Yuri: Worm? Virus? Broken network switch? Server down? Rodents chewed cat5 cable? Okay, I give up. What _did_ happen?
Nick Rout: script kiddies in the typing exam? 20 kids in the same room typing ping -f LOL Steve Holdoway: Someone stood on a cable? Derek Smithies: Give me ethereal, and a dump of the network. The answer is that someone had plugged a flylead back into the next socket. That's all. One would have thought the switch, or the upstream switch would have partitioned one or other ports off.... But nope. Instead the entire network went to shite. Give it a try, see what happens on your networks :-)
