Okay..this is driving me nuts... I am getting irregular ping requests.. Here it is Nortel Baystack 450-24T switch Computer A can ping the router and the switch Computer A recieves irregular (up and down replies) from Computer B Switch that homes Computer B is pingable all day long from Computer A Switch can ping Computer B all day long Computer A can ping all other computers on switch all day long no prob... Only one computer with this problem I feel you can pretty much take the router out of the equation here, but not sure... I have tried connecting to switch and re-entering IP, subnet and gateway information (just to do it) I have disabled and re-enabled the port - no go I have switched ports - no go All same behavior...ping replies up and down Computer B is gathering data for the application running on the machine correctly...but just not pingable from Computer A - or other computers on Computer A's side - so not just location of Computer A as the problem... Sorry if this is confusing... Anyone have any suggestions??