OT: Tool to identify Evaluate DNS clients?

Hi there

I seem to be experiencing an extreme amount of outbound DNS requests via my
FIREWALL to my local DNS Servers. I am quite confident that this traffic is
not legitimate and is most likely the source of an *evil* application ;)

Does anyone know if it is at all possible to "query" a Win2K DNS Server to
see which clients are in fact making the DNS requests? I.e. I want to be
able to see which PC is at the top of the list with regards the number of
queries, or at least see which "dodgy" domain names are being requested from
which PC's...

Any ideas?
Thanks
William R.

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