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Apple TV 2nd Gen. don't work across VLANs

Posted on 2011-02-22
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Last Modified: 2012-06-22
Background:
I have multiple VLANs in my network. One VLAN is for my Wireless network and another VLAN for my Wired network. (There are other management VLANs)

My main router is a Cisco 2900 series with a WLAN controller for the Cisco Aironet Access Points.

Problem:
When I connect the Apple TVs to the wired network, computers in the same VLAN can communicate with them and the Wireless laptops can't; and when the Apple TVs are used as wireless clients, only the Wireless laptops can communicate with the Apple TVs.

I understand the Apple TVs are not using multicasting but mDNS as I was originally targetting my focus for a solution. The funny thing is that once a multicast address was established in the WLAN, the wireless laptops were able to reach the wireless Apple TVs (Air Speaker function) which were not reachable. Perhaps this is a mDNS and multicast issue?

Cisco tells me: "The issue with this application is that it uses mDNS ip address 224.0.0.251. According to the RFC it will not route any packets with that destination:
Per RFC3171 (http://www.iana.org/assignments/multicast-addresses)"

Sought solution:
Be able to reach the Apple TVs across multiple VLANs regardless of the client source subnet (locally, of course).

IF I AM MISTAKEN IN ANY OF THE CONCEPTS DESCRIBED ABOVE, PLEASE ALSO CLARIFY WHY.

Many Thanks!

xt
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Question by:xperttech
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by:heathyob
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to my knowledge most apple technology of late relies on some kind of mDNS/Broadcast technology(bonjour).  If you can't route the broadcast traffic with your 2900 you might not be able to do what you want.  I'm not sure if the 2900 you're referring to is the old Cat2900 from 10 years ago or it's a new Cisco product.

In general broadcast technology done not go beyond it's collision domain unless otherwise routed.
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by:xperttech
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I'm referring to a new Cisco 2900 series router.
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by:heathyob
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I'm not familiar with that product so I can't speak to it specifically.  Most likely until you can find a way to have broadcasts hit both VLANs you are most likely stuck.  VLANs create separate collision domains so traffic doesn't get seen by the other VLAN.
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xperttech earned 0 total points
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Wide Area Bonjour network is the answer to this:

http://www.afp548.com/article.php?story=20090205204942121

I have not implemented this yet, but provide this info as a possible solution I found.

At the botto of the article (link above) there is a link to a piece of software that can create the WAB.

-xt
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by:xperttech
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This is what Cisco initially pointed out to me (mDNS) and after researching found this info.
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