having problems with network bandwith. My internet connection is DSL and clocks in around 1300kbps on most days, except sometimes it bogs down to about 15kbps. I work at a school with 32 computers connected: about 20 use an ethernet cable to connect to the network and about 10 are using wireless. The network topology is a daisy chain and When I disconnect one portion of the network by unplugging the cable to a switch (dlink) everything runs fast again. I've replaced the switch with a new one but the problem returns eventually. I've checked the comptuers connected on the network segement that's bad and nothing out of the ordinary seems to be causing the lag (i.e. no peer to peer networking software, or video streaming is happening). Is there a network monitor that can track the source of the problem? Or are there any basic tests that can be done while its happening to track down the source. Is it a bad network device, or a computer issue. All the comptuers have WindowsXP except one has Windows Vista.