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I would like to know if anyone is having an issue with a lot of disconnection for Mac computers with OS versions 10.5 and up. We are an Aruba deployment (M3 controllers and AP-105s/125s). For the past 3 weeks we have seen a high amount of disconnections where about 90% have been tracked Apple notebooks with the latest OS versions. I’d be grateful to hear if anyone one is having, of has had the same issue recently, and any possible recommendations to address the issues.

 

HERNAN LONDONO
Associate CIO

Barry University

 

 

********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.

Comments

Out of curiosity- what sort of 802.1x are you running (EAP types/encryption), what is your RADIUS environment, and how do you define disconnections in this context?

 

-Lee Badman

 

Lee H. Badman

Network Architect/Wireless TME

Information Technology and Services (ITS)

Syracuse University

315 443-3003

 

 

 

Message from ahockett@warnerpacific.edu

Hernan,

 

I was gifted an AP-105 at a recent Aruba conference in Portland and was excited to get to try it out.  What I found was that our Mac laptops running 10.5 or even 10.6 could not stay connected no matter how simple the configuration with WPA2.  I cannot imagine trying to deploy these for students as we have a 75% or greater use of Mac OS 10.5 or higher in our environment.  Needless to say, running the latest firmware did not help and since has soured our interest in Aruba.

 

-Aaron Hockett

Warner Pacific College

Network Administrator

 

 

 

 

Message from russ.leathe@gordon.edu

Yes, indeed.  We found that IPv6 was on by default.  The theory is, it would try to get  an IPv6  DHCP first, timeout, grab an IPv4, then retry IPv6. In doing so, disconnect.

 

From Terminal,

 

networksetup  –setv6off Wi-Fi

 

Disconnects are a major problem with OSX 10.5 and above…just read the forums on Apples site.

 

 

 

 

Lee
This is the config

Wpa-tkip and wpa2-aes

Sent from my iPhone

So you found success fixing the issue by disabling IPv6 on the Mac clients?

 

Message from trent.hurt@louisville.edu

I have been promoting disabling ipv6 here at uofl as well.  Note there are 2 different ways to disable ipv6 on OSX depends on the version you are on. 

 

http://louisville.edu/it/communications/wireless/wireless-connection-problems-how-to-disable-ipv6.html

 

Message from russ.leathe@gordon.edu

Hey Steve,

 

Great to hear from you!

 

Yes, we have seen significant improvement disabling IPv6 on both MAC’s and Window machines.  Oddly, on some MAC’s, even though we disabled IPv6, though improve performance, they still experience some disconnects.

Mainly, Mountain Lion.  I’ve researched this issue, and the solution to the problem is to downgrade the tcp/ip stack….for ML clients.

 

 

russ

Message from russ.leathe@gordon.edu

We also tried..it will go into sleep mode while some tasks are still running, thus disconnects, run the command alone  to keep it awake no matter what.  See if this helps the disconnect issue you are having.

 

caffeinate -u -t 3600

 

3600 in the above command is the number of seconds to keep the system awake. What's interesting is that you can effectively set your Mac to shut down at a specific time (that is, the built-in sleep mechanism will start counting when that time runs out). You can also run the command alone to keep your Mac awake until you stop it by pressing Control-C.

 

 

Message from lichuyan@alcor.concordia.ca

Dear All Could you please provide the links on the forums of Apple website, and other official evidence that shows IPv6 is the main reason for this problem? Some clients of ours have the same issue, we are using Cisco wireless network. Thank you. Yours, Linchuan Yang (Antony) Wireless Networking Analyst Network Assessment and Integration, IITS-Concordia University Tel: (514)848-2424 ext. 7664
Message from j2robert@odu.edu

If you're using Cisco one thing to check is that the MCS0 data rate is enabled. I had a lot of problems with Macs and iThings dropping after I disabled the 802.11b rates and MCS0. Per TAC's suggestion I re-enabled the MCS0 rate and have not been experiencing the problems since. Apparently it has to do with the OS dropping the data rate to MCS0 to save power, but not checking if that rate is supported before doing it. Josh Robertson Network Systems Senior Engineer Old Dominion University Office of Computing & Communications Services (757)683-5046 j2robert@odu.edu http://occs.odu.edu/
Message from jjj.hooper@bristol.ac.uk

>
On Sep 19, 2012, at 15:35 , James JJ Hooper wrote: > > Mac OS has pretty extensive Wi-Fi debugging facilities. You can use the > command: > > sudo > /System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport > > with various parameters to enable logging, which either comes out in the > Terminal window when you run the command, or into system.log (use "Console" > to watch system.log easily), depending on what you debug. On Lion and Mountain Lion systems, there's a GUI front end application (Wi-Fi Diagnostics.app) to this in /System/Library/CoreServices. -- Julian Y. Koh Manager, Network Transport, Telecommunications and Network Services Northwestern University Information Technology (NUIT) 2001 Sheridan Road #G-166 Evanston, IL 60208 847-467-5780 NUIT Web Site: PGP Public Key: ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
On Wednesday, 19. September 2012 at 23:40, Julian Y Koh wrote: > On Lion and Mountain Lion systems, there's a GUI front end application (Wi-Fi Diagnostics.app) to this in /System/Library/CoreServices. … or just Option-Click on the Wi-Fi-Symbol and choose "Open Wi-Fi Diagnostics…" :-) BTW, working solely on a Mac on (Cisco)-Wi-Fi since 10.6 (now 10.8) and having no issues… -- Stefan Kronawithleitner Johannes Kepler University, InformationManagement (IM) - Network and Telephony stefan.kronawithleitner@jku.at (mailto:stefan.kronawithleitner@jku.at) +43 732 2468 3923 SK3112-RIPE ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
On Sep 20, 2012, at 00:41 , Stefan Kronawithleitner wrote: > > … or just Option-Click on the Wi-Fi-Symbol and choose "Open Wi-Fi Diagnostics…" :-) Ah yes, but that's only on Mountain Lion. :) -- Julian Y. Koh Manager, Network Transport, Telecommunications and Network Services Northwestern University Information Technology (NUIT) 2001 Sheridan Road #G-166 Evanston, IL 60208 847-467-5780 NUIT Web Site: PGP Public Key: ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
HI Josh, This is an issue if you are using Aruba (or any others) also. We had to re-enable 1 & 2 mbit bit rates this week to deal with this. :-( We had previously disabled those rates last year for performance reasons. We feel this is the root cause of so many MAC disconnect/DHCP pool exhaustion problems this week for us. Chad Assistant Director of Telecommunication Planning & Implementation University Technology Services University of Denver 2100 S. High St. #112 Denver, CO 80208 Desk Phone: 303-871-4441 Mobile Phone: 303-520-5657
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