Well I Can't get my superhub to work in modem mode so I've fallen before Ive started.
First try was with my good router set with a cloned MAC. I got nothing, no IP info or anything on the status page for my router and no access to 192.168.100.1 to configure the superhub.
Second try was with a standard MAC for my router. Status page was full of all sorts of IP info (And a different WAN IP

) but still no internet access or access to 192.168.100.1.
Third try was with My PC connected straight into the superhub and again I got nothing, Windows 7 reported it as an unidentified network.
All of the above was preceded by switching off everything, then powering up the superhub, then router, then PC one at a time only starting the next after the previous was showing ready status lights.
Connection was also in the correct socket on the superhub, its the only one that lights up when in modem mode anyway. and have tried several different ethernet cables.
Finally I did a pinhole reset and I even have my good IP back which is bizarre, I aways thought it was lost forever even if you switch back to the same MAC?
So I'm a bit at a loss now, My router works fine piggybacked on the superhub when modem mode is disabled. This is in the same socket as for modem mode so no faulty sockets.