When I use an Ethernet cable to connect an additional wireless router to my Speedport Smart router (provided by Telekom), it doesn't work.  I can connect to the additional (added) router, but with no internet connectivity.  The Speedport Smart router doesn't seem to want to provide internet connectivity to any additional router hooked up via Ethernet cable.  Why is this?  Is there a certain configuration that is needed for either router to make this work?