IP address used by another computer

New to iMac. Keep getting msg that says IP address is being used by another computer. Have read Mr. Bob Timmons posts.  His post are very helpful.  So far, still haven't been able to solve on my own.  I have an AT&T combo modem/router configured to operate as modem only.  This is connected to AEBS.  Old windows machine connected to one of the AEBS ports. Wireless devices are, ipad, iphone, itouch, apple TV, iMac, and printer.
Airport settings are; connect using ethernet; connection sharing off; using DHCP; wireless mode- create a wireless network; wireless security, WPA2 Personal; MAC address access control, not enabled
Any help is greatly appreciated!

Unfortunately, this information confirms that the 2-Wire device is not configured as a "bridge only" modem...which it needs to be.
If it were, you would not even be able to Connect Using = Ethernet on the AirPort Extreme.
Instead, your only way to connect would be to Connect Using = PPPoE on the AirPort Extreme.
But, your second post confirms that it is the 2-Wire device that is supplying the PPPoE service. This again confirms that it is not acting as a bridge mode modem.
Sorry, I don't have a 2-Wire gateway here to try to see if it can even be configured as a bridge modem, but having worked with a number of users on similar subjects in the past with 2-Wire products, I doubt that it can be configured this way....despite what the 2-Wire support folks might say. I think it is likely that the version of the 2-Wire that AT&T offers has limited functionality.
Your best option might be to configure the 2-Wire normally as a gateway device and then configure the AirPort to Connect Using = Ethernet and configure the setting for Connection Sharing to "Off (Bridge Mode)"
Or, perhaps you want to explore the possibilities on the 2-Wire further?

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