I'm trying to help set up a WiFi connection to a house that has just recently got a cable internet connection. Sadly, once Vodafone set you up with a working internet connection via the modem and give you the settings (perhaps set up a single computer by ethernet), they do nothing extra for you.

What I've got here is a Motorola SB5101 SURFboard cable modem. From what I can tell, it is merely just a bridge with no layer 3 functionality what so ever. To connect to the internet the way I am, I am connecting to it directly, and manually setting up the IP address (a WAN one) onto my laptop.

I also have a NetComm ADSL2+ WiFi N300 Gateway. I can set up the WiFi just fine, however I'm having a lot of trouble setting it up with the WAN IP address and then the NAT (this feature of which looks to only handle virtual networks), as well as DHCP. I can't reconnect to this wireless router again once I change the IP address of it.

Is there any way I can get this wireless router to work, or would I be best getting a better (non-ADSL) router instead?