To expand on Trent's theme, sometimes there can be an issue when multiple "timers" expire at the same time. This is not specific to any manufacturer. Try to select session timeouts, key rotation, reauth interval, DHCP lease expiration, etc., such that they only coincide for really long sessions. Using prime numbers for all of them is ideal on paper, but it may not be convenient to find a prime numbers of an appropriate duration for your implementation. As far as I'm concerned, anything that takes longer then 24 hours to have two coincident events is fine with me. We have a minuscule percentage of sessions that long on our network.
Chuck Enfield Manager, Wireless Systems & Engineering Telecommunications & Networking Services The Pennsylvania State University 110H, USB2, UP, PA 16802 ph: 814.863.8715 fx: 814.865.3988 From: "Trent Hurt" <trent.h...@louisville.edu> To: "EDUCAUSE Wireless Issues Constituent Group Listserv" <WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> Sent: Tuesday, October 13, 2015 9:50:42 PM Subject: Re: [WIRELESS-LAN] iPads and sleep issues On the cisco what is your session timeout set to? The default is enabled and 1800 seconds it’s under wlan and advanced tab. Also you may want to check this link and look into what your broadcast key rotation is set to. The default is 1hr. I saw lots of issues with androids in the past with this and clients would drop every hour. http://wirelessccie.blogspot.com/2009/12/wpawpa2-broadcast-key-rotation-on.html From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Joe Roth Sent: Tuesday, October 13, 2015 8:22 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] iPads and sleep issues Christopher, We have a group on campus that has about 40 iPads in a cart for student use. We never had a connection issue per se with these iPads, but we did notice that every hour (literally every 60 minutes) we would see all of the iPads that were asleep and connected to a single AP suddenly disconnect then reconnect. Our wireless vendor is Cisco. To my knowledge when they woke them up they never had an issue with connecting them, we just happened to notice an hourly dip in our Prime connection graphs during the summer. I'm not sure if this helps or not.... On Tue, Oct 13, 2015 at 2:45 PM, Jeremy Gibbs < jlgi...@utica.edu > wrote: May I ask, who is your wireless vendor? -- Jeremy L. Gibbs Sr. Network Engineer Utica College IITS T : (315) 223-2383 F : (315) 792-3814 E : jlgi...@utica.edu http://www.utica.edu On Tue, Oct 13, 2015 at 2:32 PM, Butler, Christopher < cbut...@stjohnsprep.org > wrote: BQ_BEGIN I'm looking to collect some other information to help inform our process to resolve an issue we are experiencing on our wireless infrastructure. I have an open incident with my vendor and they are working on a resolution, but I'm trying to determine if we are the only ones dealing with this. We have a large deployment of iPads (1500) on our campus. somewhat evenly distributed across iPad Air 2, iPad Air, iPad 4 and iPad 3 and almost all are running iOS 8.x. We had an issue crop up this fall when a group of iPads all connected to the same access point all go to sleep at the same time. The access point seems to lose track of which devices are asleep and which aren't and it ends up overwhelming the RF space with RTS packets to iPads that don't respond, thus rendering every other client on the access point almost non-functional. Has anyone seen wireless transmit issues related to iOS "sleep" mode? The packet captures indicate that the iPads seem to oscillate quickly between "sleep" and "awake" and eventually end up asleep will the AP thinks that they are still awake. Obviously, I'm in the middle of a bit of finger pointing between the wireless vendor and Apple and other data points can only help. Thanks, Christopher Christopher Butler Assistant Head of School. Information Services St. John's Preparatory School http://www.stjohnsprep.org ********** 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/ . BQ_END -- Joe Roth Network Manager Binghamton University Ph. 607-777-7528 Fax 607-777-4009 ********** 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/.
