Establish the Ethernet connection between the 2Wire and AEBS as described in the previous post.
Connect another spare Ethernet cable from your Mac to one of the LAN <-> ports on the AEBS
Power up the AEBS, wait 25-30 seconds and then open AirPort Utility on your Mac. Select the AEBS and Click Manual Setup
Click the Base Station tab below the row of icons to name the AEBS, set up a device password and adjust Time Zone Settings. No check mark is needed next to Allow Setup over WAN
Click the Wireless tab and adjust settings as follows:
Wireless Mode = Create a wireless network
Wireless Network Name = Your choice
Enter a check mark in the box next to Allow this network to be extended if you expect to add another AirPort router at a later date to extend the network using wireless only. If not, leave this box unchecked.
Radio Mode = Automatic
Channel = Automatic
Wireless Security = WPA2 Personal is preferred, otherwise WPA/WPA2 Personal
Wireless Password = Your wireless network password
Confirm Password
Click the Internet icon
Click the Internet Connection tab
Connect Using = Ethernet
Connection Sharing = Off (Bridge Mode)
Update to save settings and allow 25-30 seconds for the AEBS to restart. You can disconnect the Ethernet cable that you used for the setup if you wish
Very important.....now power down the entire network, wait a moment, start the 2Wire first, then the AEBS, then each other device one at a time.
Using your Mac, locate the new wireless network that you named, enter the password and log on to the network.
Your computer will automatically choose the 5 GHz or 2.4 GHz band depending on its capabilities and location in relation to the AEBS.
Strongly recommend that you disable the wireless function of the 2Wire router.