Thanks everyone for your suggestions. I haven't had much opportunity yet to dig into this, but will be this weekend. As a first step, I'm going to try moving the WAN connection from an output on the router to the output from the cable modem. Then, I'm going to connect my laptop to the LAN port, and confirm that I can log onto the local web portal. I'll check out DNS settings and attempt to access external sites. If that works, then I'll swap the LAN connection over to the input on the router, and see what happens. :-)