everything, including Joeys, are all connected via ethernet
after s213 firmware update, you should only have one hopper connected. Joeys no longer need to be ethernet connected at all. They added new bridging functionality to the hopper itself. Having more than one device connected may cause issues like the joeys not linking properly.
you can see the discussion here: http://www.satelliteguys.us/hopper-zone/287210-hopper-s213-feedback-issues.html