I've then tried to set-up a static route so that I can "see" the modem behind the router using the following settings:
Destination IP: 192.168.1.1
Gateway IP: 10.0.0.1
Subnet mask: 255.255.255.255
..... which the router accepts and reports the static route as active.
The problem is though, that I can't access the V120 web config page from a browser with the address 192.168.1.1.
Can anyone please advise where I'm going wrong here. Is it in the settings or the browser address I'm using, or both?