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After upgrading my internet connection to 50mbit it was time for a new wifi router as my old Linksys capped out at 3MB/s (although 54g). So I bought a shiny Airport Extreme for super 5ghz hi-speed wifi fun. Everything worked perfectly. Everything but my old iPod touch 1G that I'm using for development to test for low-end compatibility.

I have my Airport Extreme running in dual band mode (5Ghz N for my macs and 2.4Ghz b/g for the small stuff). The problem was always the same: My old iPod Touch logged into the 2.4ghz network and lost its connection few seconds later.

Logs stated:

Associated with station 00:1d:4f:xx:xx:xx
Installed unicast CCMP key for supplicant 00:1d:4f:xx:xx:xx
Rotated CCMP group key.
Deauthenticating with station 00:1d:4f:xx:xx:xx (reserved 2).
Disassociated with station 00:1d:4f:xx:xx:xx


After searching for possible solutions on the net and tinkering with the Airport (I was just about installing my old Linksys for a 2nd wifi network for the iPod) I found the solution: Just turn off automatic radio channel selection and set a static radio channel. Seems like the Airport switches the channels too fast for the little iPod

You can do it in the Airport Utility.app (manual setup -> wireless):