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Aruba
Posts: 1,285
Registered: ‎08-29-2007

Air group - appletv mirroring across vlans

[ Edited ]

I've not had the pleasure of setting up air group etc, but found myself having to that a few times recently. I understand Airgroup is used to discover devices across different vlans.

 

After discovering, if you wanted to connect and do a mirroring, then that traffic would be unicast, correct?

 

So, any firewall between the two vlans would need to permit that traffic....and obviously needs to be routeable?


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ACCP, ACMP, ACMX #294
mclarke@arubanetworks.com
Guru Elite
Posts: 8,335
Registered: ‎09-08-2010

Re: Air group - appletv mirroring across vlans

Correct. AirGroup just solved the L2 discovery issue. After that, traffic is unicast.

Tim Cappalli | Aruba Security TME
@timcappalli | timcappalli.me | ACMX #367 / ACCX #480
Guru Elite
Posts: 8,335
Registered: ‎09-08-2010

Re: Air group - appletv mirroring across vlans

That's also the reason it's important to disable Bluetooth discovery on the newer software because it will bypass any role based discovery restrictions you are doing with AirGroup.

Tim Cappalli | Aruba Security TME
@timcappalli | timcappalli.me | ACMX #367 / ACCX #480
Aruba
Posts: 1,285
Registered: ‎08-29-2007

Re: Air group - appletv mirroring across vlans

Thanks Tim....I thought as much. So in terms of the firewall on the Aruba, that would just need to allow 'apple-airplay', or is there any other I should let through as well?


If my post is helpful please give kudos, or mark as solved if it answers your post.

ACCP, ACMP, ACMX #294
mclarke@arubanetworks.com
Aruba
Posts: 1,285
Registered: ‎08-29-2007

Re: Air group - appletv mirroring across vlans

UPDATE.  I'm going a bit round the twist with this now, and the mirroring is not quite working for some strange reason.

 

  • No traffic is being dropped at the AP or firewall level between the two subnets.
  • No traffic is being NAT’d between the two subnets in either direction.

 

What we are seeing is the following.

 

  • Sharing pictures to the AppleTV works.
  • Sharing a youtube video to the AppleTV works.
  • Mirroring from an iPhone to the AppleTV fails across vlans.
  • Mirroring from an iPhone to the AppleTV works when on the same vlan.
  • What we see on the device is that the mirroring button appears for a few seconds, then dissappears, then appears again and so on.

 

Doing a packet analysis, we found the following.

 

  • The iPhone tries to establish a mirroring session which works up to the point when the device tries to setup an RTSP session.
  • The AppleTV sends a ‘Sever 400 error’, which resets the connection and causes the mirroring to fail.

Given we can stream a Youtube video easily, it is rather frustrating.

 

Any suggestion greatly appreciated.


If my post is helpful please give kudos, or mark as solved if it answers your post.

ACCP, ACMP, ACMX #294
mclarke@arubanetworks.com
Aruba
Posts: 1,285
Registered: ‎08-29-2007

Re: Air group - appletv mirroring across vlans

ok, so after reading some other threads and observations today, it turns out ipv6 is necessary for the mirroring to work.

 

Here's another thing we found though.  When connected to the same AP as the TV, it works across vlans.  When connected to a different AP than the TV, it doesn't work.


If my post is helpful please give kudos, or mark as solved if it answers your post.

ACCP, ACMP, ACMX #294
mclarke@arubanetworks.com
Aruba
Posts: 1,285
Registered: ‎08-29-2007

Re: Air group - appletv mirroring across vlans

ok, so turns out there were some additional UDP ports that needed to be allowed through the firewall.  It is all working fine now.

 

Interestingly, when on the same vlan, the communication between the device and the AppleTV is ipv6.

 

:-)


If my post is helpful please give kudos, or mark as solved if it answers your post.

ACCP, ACMP, ACMX #294
mclarke@arubanetworks.com
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