Well, the 10.0.x.x was the factory default that Apple sent, and I clearly don't know much about what those numbers really mean or why they would choose that range. FWIW, I didn't have any problem with the DHCP functions of the router for my desktop or any of my peripherals connecting through WiFi. But are you suggesting that this might have been the source of my port forwarding problem?

Unfortunately, I can't test it now. I returned the damn thing. I might buy one again later, or at least try a different brand of 802.11n routers (suggestions?) because I would like the bandwidth for an Apple TV, among other things.

But for now, its welcome back, old friend...