Hot answers tagged airport
Go to the network preferences panel in System Preference Select airport, then 'Advanced...' Press the plus button It will work even when the network isn't near.
Your AirPort Extreme will need to "control" the network in order for this setup the way you expect. The Linksys would have to be configured as a bridge with the AirPort Extreme as the router/DHCP server. Do not that the way you have things setup currently, Time Machine will still work; however you will need to connect to the server/disk by IP address. Other ...
When flashing custom firmware, you need to be very careful. Some firmwares can cause hardware-software communication issues, so when you think a setting has been changed, it may not have been. DO NOT send it in for repair. You've probably already voided the warranty. Try to go back to your original firmware and see if it works. Any communication errors ...
The diagram at the top of the article you linked to in the question seems to show exactly what you are trying to achieve; the extended base stations are connected via Ethernet, from their WAN ports, to a network port on the primary base station. Have you tried this configuration?
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