Controllerless Networks

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Contributor I
Posts: 28
Registered: ‎11-16-2011

Instant, MacBook Pro & multicast or AirGroup problem with computer name

I just installed a small new Instant network and now we're seeing computer name change notifications popping up on Mac laptops. "The name of your computer [NAME) is already in use on this network. The name has been changed to [NAME] (1)". The number keeps incrementing everytime there is a network disruption, like after sleep or connecting a network cable.

 

I have broadcast filtering set to ARP.

In AirGroup I have enabled: Enable Bonjour, airplay, airprint, itunes, remotemgmt, sharing

 

Does broadcast filtering or AirGroup cause this or is it a combination of both? I haven't seen this on earlier installations, but often the Mac laptops use Wi-Fi only. I'm running 6.4.2.6_4.1.3.1 (IAP-205) firmware.

Guru Elite
Posts: 21,489
Registered: ‎03-29-2007

Re: Instant, MacBook Pro & multicast or AirGroup problem with computer name

If you do a search for those terms, there are a number of things that could cause that issue from the mac osx side.  Have you ruled all of those things out?  The only thing recommended to fix this on the infrastructure side is to reboot the IAP.



Colin Joseph
Aruba Customer Engineering

Looking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

Contributor I
Posts: 28
Registered: ‎11-16-2011

Re: Instant, MacBook Pro & multicast or AirGroup problem with computer name

It happens on different OS X versions (10.10.5 and 10.11.5) on different hardware and only started after we replaced old home-grade AP's with new IAP's. So it doesn't seem like a Mac problem (no 'discoveryd' on these versions anymore)

 

I disabled intrusion prevention and broadcast filtering and on AirGroup enabled 'allowall'. We'll see if those help. I couldn't find anything relevant on Airheads Community.

Guru Elite
Posts: 21,489
Registered: ‎03-29-2007

Re: Instant, MacBook Pro & multicast or AirGroup problem with computer name

You can try unchecking Enable Bonjour and Enable DLNA under Airgroup services to see if it makes a difference..



Colin Joseph
Aruba Customer Engineering

Looking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

Contributor I
Posts: 28
Registered: ‎11-16-2011

Re: Instant, MacBook Pro & multicast or AirGroup problem with computer name

I unchecked "Enable Bonjour", we'll see if that stops it.

Contributor I
Posts: 28
Registered: ‎11-16-2011

Re: Instant, MacBook Pro & multicast or AirGroup problem with computer name

Unchecking "Enable Bonjour" indeed seem to have stopped the notification from popping up. Why would enabling it cause this? I haven't seen this on earlier firmware versions.

Contributor I
Posts: 28
Registered: ‎11-16-2011

Re: Instant, MacBook Pro & multicast or AirGroup problem with computer name

Getting back to this old topic. I updated the IAP's to the latest version that was available from the AP UI, reset to factory defaults and did the whole configuration from scratch.

 

Same issue, if "Enable Bonjour" is checked, users that have a Mac laptop connected to both wired and wireless network will get this popup several times a day. There seems to be some sort of loop, where the computer will get a broadcast from the AP that there is a computer on the network which has the same name, which infact is the same computer.

 

How would I start debugging this? What should I be looking at from AP logs? Or is this a design issue when both wired and wireless networks are on the same subnet?

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