i am at college and have an airport extreme plugged into the schools network. i also have a hard drive attached to my airport. when i try to enable it with back to my mac it says there is a double nat. i know my airport is providing nat while the schools network is as well. when i go to airport utility and go under internet tab and change from share a single ip to distribute a range of ip i get an error saying the dhcp beginning and ending address conflicts with my wan ip. what do i do so i can keep the airport in my sidebar when changing networks