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Looking for an app to record network disconnections

I am having problems with an application running over telnet being sporatically disconnected on a certain workstation. This issue is only happening on one workstation and I have replaced the workstation, the drop and the cable. I believe that the workstation is somehow being disconnected for a very brief period of time (500ms or less) but I do not have any way of testing this accurately. I have tried a number of ping utilities and network monitors and none of them are capable of giving me the information that I need. Does anyone know of an application or script that will constantly monitor a network connection and document (event manager, error log, email , etc) if the network connection is broken even for an instant?
1 Solution
You could run a packet trace tool on the workstation itself for example ethereal.  Leave the trace running over a period of time.  If you're concerned with the log file getting too big you could filter the exact traffic you are interested in and also just capture the first 64 bytes of each packet i.e. the packet headers.  Look for TCP disconnects in the trace, you will see which side is sending the disconect and alos the nature of the session teardown.  For example a TCP FIN is a normal disconnect while a TCP RST (Reset) is not normal.

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