Re: [WIRELESS-LAN] Princeton determines cause of an iPad problem
We have our lease times set to 30 minutes on our campus wireless system. This was done after some trail-and-error testing. Originally, we had it set to 2 hours, but given the amount of turnover and the number of transient devices, we ran into several incidents where we exhausted our address pools. On a typical day, we have about 11000 users online simultaneously during our afternoon hours, and we see over 26000 unique authenticated users per day (which doesn't include the various other mobile devices that pass by our campus and associate to a WAP and grab an address). Jason On 04/19/2010 12:37 PM, Ryan Holland wrote: We are using /24s in our vlan pools and have 15 minute lease times. This is due to the number of transient devices (e.g., iphones and ipods) that hop online for barely a minute and then go back to sleep and disassociate. We had issues where these would exhaust our dhcp pools, even with these short lease times. So, for us, it's not a matter of one device eating multiple addresses. == Ryan Holland Network Engineer, Wireless Office of the Chief Information Officer The Ohio State University 614-292-9906 holland@osu.edu mailto:holland@osu.edu ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
RE: [WIRELESS-LAN] Princeton determines cause of an iPad problem
Another idea is provide long(er) lease times just to the Apple iPads, based on OUI. Frank -Original Message- From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:wireless-...@listserv.educause.edu] On Behalf Of Jeffrey Sessler Sent: Monday, April 19, 2010 10:28 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] Princeton determines cause of an iPad problem It would seem that Princeton could temporarily (or permanently) avoid the problem, and thus all the media hype and blocking of the iPads, by simply increasing their DHCP lease time from their stated 1-3 hour time to something more reasonable. Unless your base of devices include a large number of drive-bys (devices seen only once and never again), I'm not sure that a lease time of 1-3 hours will result in better DHCP IP address pool use than say a lease time of 24 hours. We toyed with extremely short leases years ago but found they resulted it various device anomalies. We now run with lease times of at least 24 hours and our average IP address consumption changed very little. Jeff Zeller, Tom S 04/18/10 8:54 PM http://www.net.princeton.edu/announcements/ipad-iphoneos32-stops-renewing-le ase-keeps-using-IP-address.html iPad gets DHCP lease. If iPad happens to be sleeping during the renewal time it awakens and uses the IP number forever (until shut down of unit or WiFi or going out of range) Tom Zeller Indiana University ** 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/.
Re: [WIRELESS-LAN] Princeton determines cause of an iPad problem
We are using private IP address pool with decent DHCP lease time, and iPAD would be available in Canadian market later May, hopefully there will be sort of patch or fix available by that time. Leo Song, Cluster Lead - Networking and Security (519) 824-4120 x 53181 CCS, University of Guelph - Original Message - From: Frank Bulk frnk...@iname.com To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Sent: Tuesday, April 20, 2010 9:34:46 PM GMT -05:00 US/Canada Eastern Subject: Re: [WIRELESS-LAN] Princeton determines cause of an iPad problem Another idea is provide long(er) lease times just to the Apple iPads, based on OUI. Frank -Original Message- From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:wireless-...@listserv.educause.edu] On Behalf Of Jeffrey Sessler Sent: Monday, April 19, 2010 10:28 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] Princeton determines cause of an iPad problem It would seem that Princeton could temporarily (or permanently) avoid the problem, and thus all the media hype and blocking of the iPads, by simply increasing their DHCP lease time from their stated 1-3 hour time to something more reasonable. Unless your base of devices include a large number of drive-bys (devices seen only once and never again), I'm not sure that a lease time of 1-3 hours will result in better DHCP IP address pool use than say a lease time of 24 hours. We toyed with extremely short leases years ago but found they resulted it various device anomalies. We now run with lease times of at least 24 hours and our average IP address consumption changed very little. Jeff Zeller, Tom S 04/18/10 8:54 PM http://www.net.princeton.edu/announcements/ipad-iphoneos32-stops-renewing-le ase-keeps-using-IP-address.html iPad gets DHCP lease. If iPad happens to be sleeping during the renewal time it awakens and uses the IP number forever (until shut down of unit or WiFi or going out of range) Tom Zeller Indiana University ** 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/. ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
Re: [WIRELESS-LAN] Princeton determines cause of an iPad problem
If the iPad is like the rest of Apple's product line, there's no way to distinguish it from other Apple products based on mac address. -- Ryan Holland Network Engineer, Wireless Office of the Chief Information Officer The Ohio State University 614-292-9906 holland@osu.edu On Apr 20, 2010, at 9:34 PM, Frank Bulk wrote: Another idea is provide long(er) lease times just to the Apple iPads, based on OUI. Frank -Original Message- From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:wireless-...@listserv.educause.edu] On Behalf Of Jeffrey Sessler Sent: Monday, April 19, 2010 10:28 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] Princeton determines cause of an iPad problem It would seem that Princeton could temporarily (or permanently) avoid the problem, and thus all the media hype and blocking of the iPads, by simply increasing their DHCP lease time from their stated 1-3 hour time to something more reasonable. Unless your base of devices include a large number of drive-bys (devices seen only once and never again), I'm not sure that a lease time of 1-3 hours will result in better DHCP IP address pool use than say a lease time of 24 hours. We toyed with extremely short leases years ago but found they resulted it various device anomalies. We now run with lease times of at least 24 hours and our average IP address consumption changed very little. Jeff Zeller, Tom S 04/18/10 8:54 PM http://www.net.princeton.edu/announcements/ipad-iphoneos32-stops-renewing-le ase-keeps-using-IP-address.html iPad gets DHCP lease. If iPad happens to be sleeping during the renewal time it awakens and uses the IP number forever (until shut down of unit or WiFi or going out of range) Tom Zeller Indiana University ** 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/. -- BEGIN-ANTISPAM-VOTING-LINKS -- Teach CanIt if this mail (ID 1028524510) is spam: Spam:https://antispam.osu.edu/b.php?i=1028524510m=8e500edfb024c=s Not spam:https://antispam.osu.edu/b.php?i=1028524510m=8e500edfb024c=n Forget vote: https://antispam.osu.edu/b.php?i=1028524510m=8e500edfb024c=f -- END-ANTISPAM-VOTING-LINKS ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
Re: [WIRELESS-LAN] Princeton determines cause of an iPad problem
The ipads we've seen before actually have a different oui prefix than the rest of apple's products. Don't know how unique though. --- Justin Hao j...@austin.utexas.edu University of Texas ITS - Networking On Apr 20, 2010, at 9:28 PM, Ryan Holland holland@osu.edu wrote: If the iPad is like the rest of Apple's product line, there's no way to distinguish it from other Apple products based on mac address. -- Ryan Holland Network Engineer, Wireless Office of the Chief Information Officer The Ohio State University 614-292-9906 holland@osu.edu On Apr 20, 2010, at 9:34 PM, Frank Bulk wrote: Another idea is provide long(er) lease times just to the Apple iPads, based on OUI. Frank -Original Message- From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:wireless-...@listserv.educause.edu] On Behalf Of Jeffrey Sessler Sent: Monday, April 19, 2010 10:28 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] Princeton determines cause of an iPad problem It would seem that Princeton could temporarily (or permanently) avoid the problem, and thus all the media hype and blocking of the iPads, by simply increasing their DHCP lease time from their stated 1-3 hour time to something more reasonable. Unless your base of devices include a large number of drive-bys (devices seen only once and never again), I'm not sure that a lease time of 1-3 hours will result in better DHCP IP address pool use than say a lease time of 24 hours. We toyed with extremely short leases years ago but found they resulted it various device anomalies. We now run with lease times of at least 24 hours and our average IP address consumption changed very little. Jeff Zeller, Tom S 04/18/10 8:54 PM http://www.net.princeton.edu/announcements/ipad-iphoneos32-stops-renewing-le ase-keeps-using-IP-address.html iPad gets DHCP lease. If iPad happens to be sleeping during the renewal time it awakens and uses the IP number forever (until shut down of unit or WiFi or going out of range) Tom Zeller Indiana University ** 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/ . -- BEGIN-ANTISPAM-VOTING-LINKS -- Teach CanIt if this mail (ID 1028524510) is spam: Spam:https://antispam.osu.edu/b.php?i=1028524510m=8e500edfb024c=s Not spam:https://antispam.osu.edu/b.php?i=1028524510m=8e500edfb024c=n Forget vote: https://antispam.osu.edu/b.php?i=1028524510m=8e500edfb024c=f -- END-ANTISPAM-VOTING-LINKS ** 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/.
RE: [WIRELESS-LAN] Princeton determines cause of an iPad problem
So far, the majority of the iPads we've seen have the 7c:6d:62 prefix that we've also seen on some iPhones, MacBook Pros, iPod Touches, iMac, etc.; have also seen some d8:30:62 on iPads that we've also seen on iPod Touches So, t'ain't all that unique, unfortunately. -- Jim Gogan Univ of North Carolina at Chapel Hill -Original Message- From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:wireless-...@listserv.educause.edu] On Behalf Of Hao, Justin C Sent: Tuesday, April 20, 2010 10:43 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] Princeton determines cause of an iPad problem The ipads we've seen before actually have a different oui prefix than the rest of apple's products. Don't know how unique though. --- Justin Hao j...@austin.utexas.edu University of Texas ITS - Networking On Apr 20, 2010, at 9:28 PM, Ryan Holland holland@osu.edu wrote: If the iPad is like the rest of Apple's product line, there's no way to distinguish it from other Apple products based on mac address. -- Ryan Holland Network Engineer, Wireless Office of the Chief Information Officer The Ohio State University 614-292-9906 holland@osu.edu On Apr 20, 2010, at 9:34 PM, Frank Bulk wrote: Another idea is provide long(er) lease times just to the Apple iPads, based on OUI. Frank -Original Message- From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:wireless-...@listserv.educause.edu] On Behalf Of Jeffrey Sessler Sent: Monday, April 19, 2010 10:28 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] Princeton determines cause of an iPad problem It would seem that Princeton could temporarily (or permanently) avoid the problem, and thus all the media hype and blocking of the iPads, by simply increasing their DHCP lease time from their stated 1-3 hour time to something more reasonable. Unless your base of devices include a large number of drive-bys (devices seen only once and never again), I'm not sure that a lease time of 1-3 hours will result in better DHCP IP address pool use than say a lease time of 24 hours. We toyed with extremely short leases years ago but found they resulted it various device anomalies. We now run with lease times of at least 24 hours and our average IP address consumption changed very little. Jeff Zeller, Tom S 04/18/10 8:54 PM http://www.net.princeton.edu/announcements/ipad-iphoneos32-stops-renewing-le ase-keeps-using-IP-address.html iPad gets DHCP lease. If iPad happens to be sleeping during the renewal time it awakens and uses the IP number forever (until shut down of unit or WiFi or going out of range) Tom Zeller Indiana University ** 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/ . -- BEGIN-ANTISPAM-VOTING-LINKS -- Teach CanIt if this mail (ID 1028524510) is spam: Spam:https://antispam.osu.edu/b.php?i=1028524510m=8e500edfb024c=s Not spam:https://antispam.osu.edu/b.php?i=1028524510m=8e500edfb024c=n Forget vote: https://antispam.osu.edu/b.php?i=1028524510m=8e500edfb024c=f -- END-ANTISPAM-VOTING-LINKS ** 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/.
RE: [WIRELESS-LAN] Princeton determines cause of an iPad problem
Do they have a unique VCI (vendor class identifier?? Frank -Original Message- From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:wireless-...@listserv.educause.edu] On Behalf Of Ryan Holland Sent: Tuesday, April 20, 2010 9:28 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] Princeton determines cause of an iPad problem If the iPad is like the rest of Apple's product line, there's no way to distinguish it from other Apple products based on mac address. -- Ryan Holland Network Engineer, Wireless Office of the Chief Information Officer The Ohio State University 614-292-9906 holland@osu.edu On Apr 20, 2010, at 9:34 PM, Frank Bulk wrote: Another idea is provide long(er) lease times just to the Apple iPads, based on OUI. Frank -Original Message- From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:wireless-...@listserv.educause.edu] On Behalf Of Jeffrey Sessler Sent: Monday, April 19, 2010 10:28 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] Princeton determines cause of an iPad problem It would seem that Princeton could temporarily (or permanently) avoid the problem, and thus all the media hype and blocking of the iPads, by simply increasing their DHCP lease time from their stated 1-3 hour time to something more reasonable. Unless your base of devices include a large number of drive-bys (devices seen only once and never again), I'm not sure that a lease time of 1-3 hours will result in better DHCP IP address pool use than say a lease time of 24 hours. We toyed with extremely short leases years ago but found they resulted it various device anomalies. We now run with lease times of at least 24 hours and our average IP address consumption changed very little. Jeff Zeller, Tom S 04/18/10 8:54 PM http://www.net.princeton.edu/announcements/ipad-iphoneos32-stops-renewing-le ase-keeps-using-IP-address.html iPad gets DHCP lease. If iPad happens to be sleeping during the renewal time it awakens and uses the IP number forever (until shut down of unit or WiFi or going out of range) Tom Zeller Indiana University ** 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/. -- BEGIN-ANTISPAM-VOTING-LINKS -- Teach CanIt if this mail (ID 1028524510) is spam: Spam: https://antispam.osu.edu/b.php?i=1028524510m=8e500edfb024c=s Not spam: https://antispam.osu.edu/b.php?i=1028524510m=8e500edfb024c=n Forget vote: https://antispam.osu.edu/b.php?i=1028524510m=8e500edfb024c=f -- END-ANTISPAM-VOTING-LINKS ** 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/.
