Stuck in Computer-to-Computer network

Hi,
I know this has been asked here before, but I cannot find a solution or answer: I have a Airport network with DHCP, which is also selected as the preferred network. However, occasionally, my new iMac connects to a computer-to-computer network of the same name, which I never created. Then I cannot connect to the internet and I also cannot switch back to the "real" Airport network. I found a workaround but it's cumbersome: Switch to the "real" network, then turn Airport off and back on once.
This never happened on my previous Mac. Does anybody know how and why this happens?
Thanks,
Arnd

Chris,
maybe I was a bit unclear. It seems my iMac sees my network as a 'computer-to-computer' network, although it isn't. There is no other computer. The Airport menu has two entries by the same name in that case, one being the 'computer-to-computer' netweork. After I did my little trick, the 'computer-to-computer' list entry is gone.
It's just a wild guess but it seems like the iMac connects to itself (there's no other computer here). Also, the IP it then picks is not within the range I defined in my router settings. When I switch manually to the 'real' network, it doesn't assign itself a new IP. Therefore I cannot connect to the internet. Only after I switch Airport off and back on, the iMac assigns itself a new (correct) IP and the internet connection works.
Hope this makes more sense.
Thanks,
Arnd

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Stuck in Computer-to-Computer network

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