Click the internet connection in the notification area and select open network and sharing center, select change adapter setting on the left and right click Local Area Connection. Select Create a Shortcut, then you will get a bewildering notification from Windows saying it can't create a short cut here but would you like it on your desktop? Select yes.
Now you have the LAN icon on the desktop just right-click it and select disable. To enable again then right-click and select enable.