Let me preface this with the fact that I'm just a web developer at my company with little networking knowledge.

Earlier today there was a department that lost all of their network connections so I popped open Wireshark and observed the influx of packets to my machine.

There was normal traffic (ARP requests, etc.) coming in at ~50 packets every second. Then all of a sudden the log was flooded with packets arriving ~5000 a second. It looks as though they all contain the same data, just a looped sequence.

We have someone here looking at it but I thought I would ask if anyone had seen anything like this before.

Here's a selection from one of the captures in Wireshark.

http://www.cloudshark.org/captures/06f950725c74