Not tried the Superhub in Modem Mode myself, but if it's andything like a standalone modem you need to power it off and back on everytime you change the device directly connected to it.
Superhub LAN Port #1 (must be this port, nearest the VM feed cable connector) connect the the Linksys WAN (internet) port.
Linksys LAN port (any one) can connect to your computer).
http://help.virginmedia.com/system/s...MER_TYPE=Cable