strComputer = "."

Set objWMIService = GetObject("winmgmts:\\" & strComputer & "\root\wmi")
Set colMonitoredEvents = objWMIService.ExecNotificationQuery _
("Select * from MSNdis_StatusMediaDisconnect")

Do While True
Set strLatestEvent = colMonitoredEvents.NextEvent
Wscript.Echo "A network connection has been lost:"
WScript.Echo strLatestEvent.InstanceName, Now
Wscript.Echo
Loop

strComputer = "."

Set objWMIService = GetObject("winmgmts:\\" & strComputer & "\root\wmi")
Set colMonitoredEvents = objWMIService.ExecNotificationQuery _
("Select * from MSNdis_StatusMediaConnect")

Do While True
Set strLatestEvent = colMonitoredEvents.NextEvent
Wscript.Echo "A network connection has been made:"
WScript.Echo strLatestEvent.InstanceName, Now
Wscript.Echo
Loop