A major feature in iOS 8 and Yosemite is the ability to connect to an Apple TV whilst not being on the same wireless network. The underlying technology for this is peer-to-peer AirPlay. Peer-to-peer AirPlay adds some great improvements to the old style AirPlay, if both the Apple TV and iOS or Mac support peer-to-peer they will connect this way even if they are both on the same wireless network. This removes the strain of video streaming from networks, and also improves the reliability of AirPlay streaming. Peer-to-peer AirPlay needs no configuration.
Peer-to-peer AirPlay requires the following:
- Apple TV 3rd Gen (Rev A) – Model Number A1469
- Mac from 2012 or later, running OS X Yosemite. Some unsupported models can be enabled by using the Continuity Activator.
- iOS Device from 2012 or later, running iOS 8
Apple also recommends not using the 149 or 153 5Ghz wireless channels on your infrastructure wireless networks, not using these channels will eliminate any interference between the Apple TVs network and your wireless network.
Further information can be found in this great reference page from Apple.