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After some trouble with my Buffalo router, I switched to a Medialink Wireless N Router. (I was sad to lose dd-wrt, but the Medialink had great reviews on Amazon and a good price point.)
The issue I've run into is that none of my devices on the wireless network can access each other. For example, I cannot file share from my laptop to my desk, nor can I still do things like have my iPhone control my Apple TV or Apple TV access my desktop iTunes.
My hunch is this is a simple security setting, but I've been banging my head against the wall for an hour now. Any advice? If there's an official networking term for what I want to do, that would at least help with my searching.