Have you tried setting up a filter on your APs to block out all IPv6? We had similar symptoms on Macs that turned out to be due to Windows machines with broken ICS configurations sending out RA packets, even though they didn't have any real functional IPv6 configuration. The apparent flapping was due to dead gateway detection on the Macs. Filtering our all IPv6 packets prevented the clients from getting the bogus IPv6 connectivity, and cleared up the symptoms.
Frank Sweetser fs at wpi.edu | For every problem, there is a solution that Manager of Network Operations | is simple, elegant, and wrong. Worcester Polytechnic Institute | - HL Mencken On 10/26/2012 11:06 AM, Christopher Wieringa wrote: > We have been having issues with certain Macs dropping off our wireless > network as well this semester, and have tried a variety of things to resolve > it. > > 1. (As Lee mentioned) Disable IPv6 if you aren't running it on your wireless > network. > 2. Make sure that MCS rate 0 is not disabled for 802.11n (both 5ghz and > 2.4ghz) ( http://tinyurl.com/8boy3dp ) > 3. Tune the aggressiveness down of Client Load Balancing or disable it > altogether > > The one thing that made the most difference was #1; disabling IPv6 on the > end-user machines have cleared up almost every one of my complaints. I've > played with options 2 and 3 pretty extensively, but I couldn't see any > noticeable change for our end-users by adjusting them. > > Chris > >>>> On 10/26/2012 at 10:30 AM, Lee H Badman <lhbad...@syr.edu> wrote: >> Though it can come across as a cop-out, have you disabled IPv6 on the >> clients? >> >> >> >> >> >> -----Original Message----- >> From: The EDUCAUSE Wireless Issues Constituent Group Listserv >> [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Jason Healy >> Sent: Friday, October 26, 2012 10:22 AM >> To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU >> Subject: Re: [WIRELESS-LAN] MAcbooks dropping off wireless network >> >> On Oct 25, 2012, at 10:04 AM, "Legge, Jeffry" <jgle...@radford.edu> wrote: >> >>> Can someone direct me to articles that discuss possible fixes for this? >> >> We're an all-Apple campus, so I may have some suggestions depending on the >> exact symptoms. >> >> There is one issue we're having that we haven't been able to fix with our >> Aruba AP65s. "Something" triggers a condition where many of our users can't >> stay associated with the AP (they connect for about 10 seconds, then >> disassociate, then re-connect for 10 seconds again.). >> >> Aruba tells us this is a "vendor compatibility issue", but despite hours of >> troubleshooting and packet captures they haven't given us any more than >> that. >> The issue is still happening (just happened in one building yesterday). >> Very frustrating, as this has been going on for months. >> >> Jason >> >> -- >> Jason Healy | jhe...@logn.net | http://www.logn.net/ >> >> ********** >> Participation and subscription information for this EDUCAUSE Constituent >> Group discussion list can be found at http://www.educause.edu/groups/. >> >> ********** >> Participation and subscription information for this EDUCAUSE Constituent >> Group discussion list can be found at http://www.educause.edu/groups/. > > > ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
