Does anyone know of a tool to help uncover network bottlenecks? Our system is set up with all XP Pro clients, 1 Win2K3 server (DC and print server), 1 SuSE Linux Enterprise server (DHCP and file server) with a NAS attached to it. The servers are on the 1st floor of the building and most of the clients are on the 4th. The switch (1st floor) is connected to a glass fibre channel converter through to the 3rd floor to another switch and then to another converter to the 4th floor and from there to the patch panel and the rest of the network (all 3 switches are gigabit). The people on the 1st floor have a relatively fast connection to the data (they can open network shares and files very quickly) but the poor sods on the 4th floor take longer to open a share and forever to open any data file. As you can imagine this does not make it very easy for the people to work and no-one is happy with the situation seeing as it was supposed to turn out just the opposite (faster connections and better performance). Any help would be appreciated.