Just wanted to share my experience with ATV no longer waking up my Mac to access the iTunes library, after upgrading to Mavericks. I went directly from Snow Leopard. This is for anyone else who might have had this problem. After ensuring iTunes Home Sharing is turned on, Bonjour proxy enabled, Mac wifi turned on with my network identified, and Energy Saver set to "wake for network access", still no success. What seemed to finally fix it was an Airport Utility change. Under Internet Options, changing Configure IPv6 from "link-local only" to "Automatically" seemed to do it. Then restarted Airport Extreme. I may be wrong and it could have been a fluke with something else having been changed, but this is the last change that seemed to fix the issue.