I am not sure if such a tool exists as neither does anyone else I know, but.. does anyone know of any software I can install on a system to see what machine is sucking out all of the internet bandwidth? I am admin of a Windows domain with about 15 - 20 users at any given time and too often it is slow because someone is uploading/downloading something and tracking it down is difficult. Unfortunately the networking hardware is all mostly residential class (the setup predates me, not taking the blame there). My domain controller handles all DHCP and DNS. Anyone know of anything I can add to it to see some real-time statistics?