I have 2 buildings tied together with a wireless bridge, with both buildings on the same subnet. Main building has an RV042 with VPN's running to remote offices. I have a DSL available in the second building. I loose connectivity on the Wireless Bridge for upwards of 5 minutes, do to delivery trucks blocking line of sight, and we are restricted on height for antennas. Can Anyone recommend hardware, that would allow the 2nd building to drop to a VPN on the slower DSL when the bridge is offline?