I did that, but nothing happened.  HOWEVER I did a soft "reset" of the system (kept data, reloaded the base software, etc.) and everything worked.  Looks like a failure on the Realtek audio driver may have caused an issue with the Realtek network card(s).  SO now everything for this issue is good.   Now off to the next one. Thanks! -Sam 
I have a new XPS 9710 that I am connecting to a WD-19S dock and it works great, except it remains on the wireless network.  I have looked in the specs and setup and see where there are 2 Ethernet configurations in the network lists, but nothing is connecting.  I would like to have the unit pick up on the faster wired network when it is docked as upgrades and such are much faster than the wireless connection.   I am going to check the BIOS setting, once the current upgrade process finishes.. hopefully by tonight.   AND NO, this is not connected to a dial up modem,  I am updating some development tools and they have to validate conflicts in support packages, which makes a lot of external calls... Thanks in advance! -Sam 
how to get new 9710 to swap to hardwire network when docked...