Any Wi-Fi experts in the house? Stupidly having wasted my weekly AskMefi question on how to cook a steak, I now need your help. →[More:]

My system is fairly simple, I guess. Living in a locality that has changed little since the dark ages, I still only have dial-up internet. I also have a laptop with wireless, and as of this afternoon, the PC that I usually dial up to the internet with also has a wireless card.

Now, I've enabled Internet Connection Sharing between these two computers over Ethernet before and it's worked fine. I assumed, that if I created an ad-hoc wireless network, the same situation would apply. Well, the ad-hoc wireless network did work great, for general windows file sharing between the two computers, but the laptop ain't getting through to the internet. Indeed, looking at the ipconfig output, when the laptop is on the wireless network, it has a strange IP address (not the 192.168.0.x you might expect) and no Default Gateway defined, which would explain a lot.

Any ideas? Is what I'm trying to do possible? (Sharing a dial-up internet connection over ad-hoc wireless) this page at Microsoft would seem to suggest so, and I've followed it to the letter, but it ain't happening. My dreams of contributing to Metafilter from a banana lounge in my backyard are looking shaky.