Is the default IP address when in router mode 192.168.0.1? Look in the User Manual to check. Make sure your connected PC is set up for obtaining a IP address from this unit or a host router if this device is connected to a different router. If this unit is connected to a different router, you'll need to find out what or if the DVG has a different IP address assigned from the main host router.
Let us know if you were able to resolve this.