I have a latest model (2012, 2.4Ghz/5Ghz simultaneously) Airport Express serving WiFi for my house. I have an older model, 802.11n, Airport Express set to "extend a wireless network". On the new AE I have both the 2.4 and 5 GHz networks with the same SSID.
The difficulty is that the older AE, which can only do one band at a time, always chooses to extend the 5 GHz network instead of the 2.4 GHz network, which is what I want.
I've tried changing the SSIDs of the 2.4 Ghz and 5 Ghz networks to be different and having the old AE extend the 2.4 Ghz one. That works fine. If I change the SSID's back to match, however, the older AE will switch which network it extends from the 2.4 GHz one to the 5 GHz one.
I find this odd behavior and I can't find a workaround. Thoughts?