Network Flooding

Just use Network Monitor for NT. You can take a snapshot of all incoming traffic and then filter to find the offending system.
There are lots of other network sniffers but you will find alot of support from Microsoft on the web site if your unfamiliar with it.
Its also free on the resource kit and downloadable from the MS web site.

You can use NT's Network Monitor to monitor traffic however be careful which one you use. The version that comes with SMS inspects all traffic whereas the "other" version will only inspect traffic to your machine. Depending on how your network is configured and how the flooding appears to occurr a simple method is to segment your network when the flooding occurrs, ie: power off hubs, switches and or routers and hopefully isolate it down to a subnet or segment. If that is not possible i found that Net Xray is a useful tool. It gives a graphical representation of the top talkers on the network along with the relevant info.

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