i can comment only using modem mode
if you set the SH in modem mode then you need to connect the cable at lan 4 at SH (the one next of the white coax cable)
then will be able to access 192.168.100.1 and 192...0.1
If you have it at lan 1 of SH will not give access to router either to pcwhen is with modem mode
http://www.cableforum.co.uk/board/35446137-post348.html