Notification when using Private Address Feature
At the time of device join to the network, a nice feature would be to check if the device is using the private address feature of newer iPhones, etc. and suggest to the user to turn that feature off for their home network.
We do that onsite here at work for our guest wireless network when a device joins it since you have to register the MAC under your account for "guest" devices. We actually don't let them join the wireless network until they turn that feature off.