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Not sure, i'd run some tests, disable the WiFi on each device at each location and see what they pick up. If they don't pick up the 1525 when they are near that, then possible that something isn't right...If you didn't change anything between the old location and the new location, things should work...How far away is the DAP from the DIR?
DNS values would me for entire internet access both LAN wired and wireless. It won't effect device connections on Wifi to router or DAP.