readynas duo dns gui

Hi Guys, I use dyndns to access my nas when i'm outside my lan, the problem is the dyndns domain doesn't work when inside my lan it just ends up at my router login screen, so I have to keep manually changing config files on my laptop to access the nas when local/remote. Would setting my router up to point at the nas for dns fix this? I've had a look at bind dns but looks quite scary with a lot of config files, is the a dns gui for the readynas?