I had this working before. I have a lousy ActionTec router with weak wifi on one floor. I want to join the express to the ActionTec as if its a wireless client. Then run a cable from the express to a switch for other devices on the floor. One of the devices is the extreme, which I want to simply use as an access point for a new SSID. I could get this working if I double NAT. But I don't want that. The Express connects fine and gets an address. The extreme seems to have gathered a valid IP from the actiontec DHCP. The extreme 'looks' fine. But the iphone will not join the extreme's wifi. Airport utility on the iphone shows the extreme and everything looks normal and I can configure it with the iphone. However, when trying to connect to the extreme wifi, the phone just keeps spinning. I assume its spinning because its not getting a DHCP address. ideas?