Well tbh its self explanatory, not just to you but to others this is a savior! Think about it, if we left the Secondary input all Zero's as it comes standard on all Zero's, then the WiiU will detect that as no DNS entry so if the Primary goes wrong, it reverts to the Secondary slot standard cause thats what its there for back up, reads it as all Zero's and then thinks Argh no DNS has been entered so I will revert back to my original internet settings which in turn, turns the DNS off the WiiU then has full access to updating which it will do and update asap while your systems on standby, which you would not know this has ever even gone on because you thought entering>107.211.140.065 in just the Primary Field will be OK and very safe but your very wrong..