To expand on Mark’s post… Could it be (as Mark suggests) that the ethernet setup in the HR21 (and HR20-600??) is in fact an ethernet switch that has not been fully enabled in the software (2nd external port currently disabled). For instance a 3 port switch with the 1st external port being used as the uplink/cascade port, the 2nd external port currently disabled, and a 3rd internal port hardwired for use by the HR21. This would allow the 2nd external port to eventually act as a “pass-through” as suggested in the First Look write-up and would explain the existence of this mysterious rudimentary 2nd external port that has puzzled so many of us. Does anyone have more info on this?