监视网络连接：
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
监视网络断开：
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
Loop
原文：http://www.jb51.net/article/40105.htm