AppleTV uses Bonjour/ZeroConf to advertise its services. With registered DHCP for both the AppleTV and iPads, do you see both devices on the same subnet? I would doubt that ZeroConf would work across subnet boundaries. ATS may also be blocking the advertisement on MSUNet Wireless. Subnet boundaries also should explain pretty well why your iPads can't see the AppleTV when they're on wired connections. (ZeroConf is a broadcast/multicast service and so definitely isn't transported between subnets.)

Your best bet is to have a single NATed access point in your conference rooms and then just have instructions on how to join to that on a nice, big poster. That will solve your ZeroConf issues and it's a supported solution on ATS's side since we let students do that. Either that or do what we do at UR and segment your network away from the campus LAN with your own firewall and DHCP server. We have ZeroConf-like services running here without issue, but we have all of our clients trunking back to our server room and we uplink to campus fibre from there.

----
 Jack Kramer
 Manager of Information Technology
 University Relations, Michigan State University
 w: 517-884-1231 / c: 248-635-4955

From: "Ryan M. Finn" <[log in to unmask]>
Reply-To: "Ryan M. Finn" <[log in to unmask]>
Date: Wed, 30 Nov 2011 11:08:53 -0500
To: "[log in to unmask]" <[log in to unmask]>
Subject: [MSUNAG] Apple TV

"Cry "Havoc," and let slip the dogs of war".

 

All Apple haters, prepare thyselves…

 

 

In RHS we have purchased a couple of Apple TVs.  We were playing around with them to see if Airplay Mirroring might be a useful addition to our conference room toolset (seeing as how everyone in our division is buying iPads with or without our consent/knowledge).

 

For those who aren’t aware, Airplay allows iPad and iPhone users to stream audio and video from their device to the Apple TV.  Airplay Mirroring allows users of iPad 2 or iPhone 4S to stream their display (and any audio/video) to the Apple TV and display it on the connected monitor/TV.

 

Anyway, Apple being a big fan of the “it’s magic; don’t question it” approach to life, the instructions with the Apple TV read a little something like “plug it in and your iPad will sense the disturbance in the force”.  And it does; The Airplay icon just magically appears on your iPad and disappears when you disconnect/cannot talk to the Apple TV.  This is all really cool until you try to use it and it doesn’t work as expected, and then you have no idea what’s up.

 

What we KNOW:

1)      If we set up an access point serving DHCP (not connected to the campus network) and join an iPad and the Apple TV to it, the force is strong and Airplay Mirroring works.

2)      If we set up the iPad and the Apple TV on the campus network (registered DHCP for both), the force is weak and Airplay Mirroring fails.

a.       Everything else on the Apple TV (YouTube, Netflix, etc.) seems to work just fine on registered DHCP.

3)      If we use the wired Ethernet on the Apple TV and place it on either DHCP or a static address (the results are the same), the force is weak and Airplay Mirroring fails.

4)      The ports used by the Apple TV are listed in the following Apple article: http://support.apple.com/kb/HT2463.  More information about Apple ports in general can be found in this article: http://support.apple.com/kb/TS1629

 

What we THINK we know:

1)      We THINK Airplay uses port 7000 and Airplay Mirroring uses port 7100.  This information was found on a third-party website where they were attempting to hack the Apple TV in general, and Airplay Mirroring specifically.  The following link is where we found this information: http://www.aorensoftware.com/blog/2011/08/20/exploring-airplay-mirroring-internals/.  Note that those two ports are not listed in the Apple documentation.  They may be in another article I haven’t found, though.

2)      We THINK the Apple TV is using Bonjour to broadcast its existence on the network.

3)      We THINK our issues are centered around using Bonjour on the campus network.

 

 

So… Are we on the right track and is there anything we can do about it?  We can make a fully functional setup by using our own access point and attaching it to the campus network, but we expect that solution would not be palatable to ATS.  I’m wide open to suggestions on things to test.

 

Thanks,

 

Ryan M. Finn

Systems Administrator

Residential and Hospitality Services

Michigan State University