Although I will admit, my experience with WHS is limited, I have installed, integrated and supported all other versions of Windows Servers since NT4.0 up to and including Windows Server 2008 r2, the lates release, so as I stated earlier, does the WHS box have multiple NICs, please pick one of the machines that is showing multiples and from an elevated command prompt please type nbtstat -c and examine the information in the netbios cache it should be relatively straight forward and list an individual IP and it's associated netbios name, if you can please post the information in your next post and maybe I can better understand the nature of the issue.