I contacted Apple because I am not able to create any guest Network on my Airport Extreme because I was told that my modem needs to be simple. Per Apple: "The Guest Network feature will not operate correctly unless your "main" AirPort Extreme is connected to a simple modem........not a modem/router (such as the Actiontec MI424WR Rev.1) or gateway type of device that is often furnished by Internet Service Providers to their customers."
So is it possible to make this version of Actiontec a simple modem. Is this even possible or will I need a new modem?
NOTE: I disabled the wireless functionality of the actiontec.