监视网络连接与断开，特殊情况下可能有点用，两个VBS脚本均来自微软官网  

监视网络连接：

复制代码 代码如下:
strComputer = "."

Set objWMIService = GetObject("winmgmts:" & strComputer & "rootwmi")
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：

复制代码 代码如下:

strComputer = "."

Set objWMIService = GetObject("winmgmts:" & strComputer & "rootwmi")
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