Reasons for NOT upgrading to iOS 7?
One of my editors noted there are stories online about the large percentage of upgrades to iOS 7 in a very short time; but he himself has NOT. He wondered about why others may be refusing or delaying the upgrade. I was curious about what, if anything, you folks are hearing about this, either through personal conversations (or even impressions) or possibly feedback from the Help Desk staff as they deal with endusers? Again, in keeping with Listserv rules, no one will be quoted/identified; at this point just trying to see if this is worth exploring. Thanks. Regards, John Cox Senior Editor Network World 492 Old Connecticut Path Framingham, MA 01701 USA Direct: 978-834-0554 HQ reception: 508-766-5301 john_...@nww.commailto:john_...@nww.com www.networkworld.comhttp://www.networkworld.com/ ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
RE: [WIRELESS-LAN] Reasons for NOT upgrading to iOS 7?
Regarding Julian's point...anyone know of folks actually doing work to evaluate speed differences of older iOS devices that HAVE upgraded to iOS 7? -Original Message- From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Julian Y Koh Sent: Tuesday, September 24, 2013 9:15 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] Reasons for NOT upgrading to iOS 7? On Sep 24, 2013, at 08:00 , j...@nww.com wrote: One of my editors noted there are stories online about the large percentage of upgrades to iOS 7 in a very short time; but he himself has NOT. He wondered about why others may be refusing or delaying the upgrade. Personally I am concerned about how much slower iOS 7 will be on my iPhone 4S. I got burned pretty badly with the iOS 4 upgrade on my iPhone 3G. Also I'm due for a phone upgrade, and Apple is offering pretty good trade in value for my 4S, so I might just go for a new 5s now. -- Julian Y. Koh Acting Associate Director, Telecommunications and Network Services Northwestern University Information Technology (NUIT) 2001 Sheridan Road #G-166 Evanston, IL 60208 847-467-5780 NUIT Web Site: http://www.it.northwestern.edu/ PGP Public Key:http://bt.ittns.northwestern.edu/julian/pgppubkey.html ** 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: iOS7 Release Sep 18th
Cisco has something on this, on their website. I'm just now starting to read it: Get Your Network Ready For iOS7 http://blogs.cisco.com/wireless/get-your-network-ready-for-ios7/ From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Bhutta, Rizwan A. Sent: Monday, September 16, 2013 4:35 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: [WIRELESS-LAN] iOS7 Release Sep 18th Hi, With iOS7 being released on September 18th, anticipated availability time is noon EDT, what strategies are people employing is addressing the high bandwidth demand at that time? The size of the iOS7 update is about 1.2GB. I am more interested to hear strategies related to wireless infrastructure and commodity bandwidth utilization. Thanks Sincerely, === Rizwan Bhutta Assistant Director, Enterprise Architecture. Information Technology Services (ITS), Engineering Computational Science Building Old Dominion University 4700 Elkhorn Avenue 4th Floor, Room 4300 Norfolk, VA 23529 Office: 757-683-3586. Fax: 757-683-5155. E-Mail: rbhu...@odu.edumailto:rbhu...@odu.edu http://www.odu.eduhttp://www.odu.edu/ . ** 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] Major WLAN/mobile projectcs coming online for Fall '13? Just wondering...
Thanks, Russ. Given that you don't have the MDM product you'd like right nowdo you run separate management systems for smartphones vs laptops/tablets? From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Russ Leathe Sent: Wednesday, August 21, 2013 1:39 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] Major WLAN/mobile projectcs coming online for Fall '13? Just wondering... As far as .11ac, I don't see us involved for another year at least. Waiting for .11ac laptops/tablets/smartphones to sell the inbedded chipset first. MDM is key, looking for a product that protects mobile as well as laptop/tablets Malware policies for users. Handle this via our NAC. We are using mDNS via our wireless WLAN. Students register their own device(s) and depending on which one, they get pushed to production or secondary VLAN(s) Nutshell version, russ From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of j...@nww.commailto:j...@nww.com Sent: Monday, August 19, 2013 9:20 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDUmailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: [WIRELESS-LAN] Major WLAN/mobile projectcs coming online for Fall '13? Just wondering... It would be interesting - to me at least! - to see if there are any commonalities in Education IT priorities for the new academic year. 11ac exploration? Improved mobile device management? New user policies? Bonjour/Apple TV etc? In keeping with the Listserv policies, this query is NOT for a story that I plan to write. For me as a reporter, it's food for thought, which could eventually generate a story idea. Regards, John Cox Senior Editor Network World 492 Old Connecticut Path Framingham, MA 01701 USA Direct: 978-834-0554 HQ reception: 508-766-5301 john_...@nww.commailto:john_...@nww.com www.networkworld.comhttp://www.networkworld.com/ ** 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/.
Major WLAN/mobile projectcs coming online for Fall '13? Just wondering...
It would be interesting - to me at least! - to see if there are any commonalities in Education IT priorities for the new academic year. 11ac exploration? Improved mobile device management? New user policies? Bonjour/Apple TV etc? In keeping with the Listserv policies, this query is NOT for a story that I plan to write. For me as a reporter, it's food for thought, which could eventually generate a story idea. Regards, John Cox Senior Editor Network World 492 Old Connecticut Path Framingham, MA 01701 USA Direct: 978-834-0554 HQ reception: 508-766-5301 john_...@nww.commailto:john_...@nww.com www.networkworld.comhttp://www.networkworld.com/ ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
Chromebook printing issues -- enterprise networks?
I seem to be seeing online two views on Chromebook printing (just coming up to speed on this myself) - one group seems to think it's easy and convenient; the other...not so much. Is this an issue for you folks and how are you dealing with it? I am researching a story about this; my purpose in posting about this issue on the listserv is to get a sense of whether this is an issue and some of the ways people are dealing with it. I was talking with one IT exec who says the way Chromebooks deal with printing is a showstopper for his organization. Regards, John Cox Senior Editor Network World 492 Old Connecticut Path Framingham, MA 01701 USA Direct: 978-834-0554 HQ reception: 508-766-5301 john_...@nww.commailto:john_...@nww.com www.networkworld.comhttp://www.networkworld.com/ ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
One idea on iOS 6 Wi-Fi issues: extended capabilities tag (from Apple's support board)
Passing this along...IT guy at the prep school got back to me. Their WLAN is the H3C gear that 3Com had licensed, now part of HP. New last year. Researching, they found this comment (below) from another HP/H3C customer site, which indicates one explanation for the problem at least with H3C gear: it has to do with the extended capabilities tag, which apparently was modified in the IEEE 802.11-2012 standard. From what I can tell, there's a mismatch between Apple and HP's support of the most recent standard, which is read as a fatal error by the network. Here's the excerpt he sent me: https://discussions.apple.com/message/19727441#19727441#19727441 Now, the IEEE Std 802.11n-2009 states that this parameter should have only 3 as valid length. Contrary to that, the current IEEE Std 802.11-2012 defines the valid length between 3 and 8. It seems that our HP/H3C equipment treats Extended Capabilities parameter length == 4 as fatal error and rejects the association (instead of just ignoring this parameter). From the formal point of view, Apple's implementation is correct, and HP should correct its firmware. We've got in touch with HP about this issue and are now awaiting their response. Nevertheless, I hope that Apple updates iOS 6 that no Extended Capabilities parameter is sent during association, since its purely redundant, as it contains just..[the rest of this post is a table of the various entries, which is shown in linked post]. It seems unlikely to me that Apple will deviate from a standard that it's embraced. Regards, John Cox Senior Editor Network World 492 Old Connecticut Path Framingham, MA 01701 USA Direct: 978-834-0554 HQ reception: 508-766-5301 john_...@nww.commailto:john_...@nww.com www.networkworld.comhttp://www.networkworld.com/ ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
RE: [WIRELESS-LAN] Monday 9/24 update on iOS 6 Wireless Issues
Just an update on the issue with that 3Com site which contacted me last week I've not heard back from this guy, despite several emails to him. Another IT guy with a 3Com infrastructure also contacted me saying they were running into similar problems: interestingly, when they disconnected the 3Com APs from the their switch, everything worked fine. It turns out, THIS network is using the H3C gear that 3Com had started to license and resell before the HP acquisition - this was NOT legacy 3Com WLAN equipment. I passed onto him a comment sent to me by an HP guy, speaking unofficially: he says there is a known issue related to this for the H3C equipment. He didn't elaborate because it's not his area of expertise. I assume that means if folks reach out to their HP tech support contact, they should be able to resolve this, assuming this known issue is in fact what's messing up the Wi-Fi conection. My impression is users at this second site did NOT have problems connecting to OTHER - not 3Com/H3C, but I probably need to recheck my notes on that. Regards, John Cox Senior editor Network World From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of David Gillett Sent: Friday, September 21, 2012 5:50 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] iOS 6 Wireless Issues Twice I've had to tell my iPad2 to forget all about and relearn my home wireless network. But both times were before updating to UIOS 6 (one might have been before IOS 5), and I have not yet had any issue with either home or campus (Aruba) wireless since updating to IOS 6. Just one data point David Gillett Sr Security Engineer Foothill-De Anza Community College District Los Altos Hills, California From: Hurt,Trenton W. [mailto:trent.h...@louisville.edu]mailto:[mailto:trent.h...@louisville.edu] Sent: Friday, September 21, 2012 10:48 To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDUmailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] iOS 6 Wireless Issues Is anyone seeing any other iOS 6 wifi issues? I have had a few iphones/ipads that where working fine on 5.1.1. Once upgraded they would no longer connect. The fix has been to reset all network settings. Thanks Trent From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU]mailto:[mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Bryan Sherwood Sent: Wednesday, September 19, 2012 8:54 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDUmailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] iOS 6 Wireless Issues We saw the same issue at our campus today, but it appears the page that Apple uses to check connectivity is now back up: http://www.apple.com/library/test/success.html We've only been able to test a few users but it appears that has fixed the problem. -- Bryan Sherwood End User Computing Specialist Intern Information Technology Services Student Technology Center Northern Arizona University (928) 523-6634 From: Cappalli, Tim G @ LSC-OIT tim.cappa...@lsc.vsc.edumailto:tim.cappa...@lsc.vsc.edu Reply-To: The EDUCAUSE Wireless Issues Constituent Group Listserv WIRELESS-LAN@LISTSERV.EDUCAUSE.EDUmailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Date: Wednesday, September 19, 2012 5:50 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDUmailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU WIRELESS-LAN@LISTSERV.EDUCAUSE.EDUmailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: [WIRELESS-LAN] iOS 6 Wireless Issues I experienced some dropouts and random redirects to an Apple page cannot be displayed page after updating an iPad 3, err new iPad, to iOS 6. A few articles are floating around that suggest tweaking the proxy settings resolves the issue. http://gizmodo.com/5944761/does-ios-6-have-a-wi+fi-bug Tim Cappalli, ACMP CCNA | (802) 626-6456 Office of Information Technology (OIT) | Lyndon cappa...@lyndonstate.edumailto:cappa...@lyndonstate.edu | oit.lyndonstate.eduhttp://oit.lyndonstate.edu/ [cid:image001.png@01CD9A73.A3516730] Sent from Windows 8 and Outlook 2013 ** 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/. ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/. inline: image001.png
RE: [WIRELESS-LAN] Monday 9/24 update on iOS 6 Wireless Issues
Great...I'm replying to my own message! I'm doing some online researchit still seems that some number of people are reporting Wi-Fi problems with either iOS 6 upgrades or the new iPhone 5. And *apparently* on other-than-3Com WLANS Here's what I've found... At Apple Support Communities you can find the body of the original email to me...and a handful of replies https://discussions.apple.com/thread/4318686?start=0tstart=0 Here's the most recent user reports at MacRumors' Forums, as of this Monday PM; again seems to be problems with a range of, in this case, home wireless routers (I assume different brands). http://forums.macrumors.com/showthread.php?t=1449688highlight=ios+6+wifi+problempage=8 This is the MacRumors Forum site for the RESOLVED iOS 6 WiFi problem, except that today, users were still posting about problems. http://forums.macrumors.com/showthread.php?t=1446596highlight=wifi+ios+6page=19 So...anyone else running into problems related to iPhone 5 or iDevices upgraded to iOS 6? As a reporter with Network World, I'd *already* decided to write a story on this. Under what I understand to be the Listserv rules, I will NOT be quoting anyone who posts here. If you are running into problems, I'll probably drop you an email directly to see if you'd like to share details. Thanks. Regards, John Cox Senior editor Network World From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of j...@nww.com Sent: Monday, September 24, 2012 4:43 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] Monday 9/24 update on iOS 6 Wireless Issues Just an update on the issue with that 3Com site which contacted me last week I've not heard back from this guy, despite several emails to him. Another IT guy with a 3Com infrastructure also contacted me saying they were running into similar problems: interestingly, when they disconnected the 3Com APs from the their switch, everything worked fine. It turns out, THIS network is using the H3C gear that 3Com had started to license and resell before the HP acquisition - this was NOT legacy 3Com WLAN equipment. I passed onto him a comment sent to me by an HP guy, speaking unofficially: he says there is a known issue related to this for the H3C equipment. He didn't elaborate because it's not his area of expertise. I assume that means if folks reach out to their HP tech support contact, they should be able to resolve this, assuming this known issue is in fact what's messing up the Wi-Fi conection. My impression is users at this second site did NOT have problems connecting to OTHER - not 3Com/H3C, but I probably need to recheck my notes on that. Regards, John Cox Senior editor Network World From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU]mailto:[mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of David Gillett Sent: Friday, September 21, 2012 5:50 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDUmailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] iOS 6 Wireless Issues Twice I've had to tell my iPad2 to forget all about and relearn my home wireless network. But both times were before updating to UIOS 6 (one might have been before IOS 5), and I have not yet had any issue with either home or campus (Aruba) wireless since updating to IOS 6. Just one data point David Gillett Sr Security Engineer Foothill-De Anza Community College District Los Altos Hills, California From: Hurt,Trenton W. [mailto:trent.h...@louisville.edu]mailto:[mailto:trent.h...@louisville.edu] Sent: Friday, September 21, 2012 10:48 To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDUmailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] iOS 6 Wireless Issues Is anyone seeing any other iOS 6 wifi issues? I have had a few iphones/ipads that where working fine on 5.1.1. Once upgraded they would no longer connect. The fix has been to reset all network settings. Thanks Trent From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU]mailto:[mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Bryan Sherwood Sent: Wednesday, September 19, 2012 8:54 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDUmailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] iOS 6 Wireless Issues We saw the same issue at our campus today, but it appears the page that Apple uses to check connectivity is now back up: http://www.apple.com/library/test/success.html We've only been able to test a few users but it appears that has fixed the problem. -- Bryan Sherwood End User Computing Specialist Intern Information Technology Services Student Technology Center Northern Arizona University (928) 523-6634 From: Cappalli, Tim G @ LSC-OIT tim.cappa...@lsc.vsc.edumailto:tim.cappa...@lsc.vsc.edu Reply-To: The EDUCAUSE Wireless Issues Constituent Group Listserv
RE: [WIRELESS-LAN] iOS 6 Wireless Issues
I was just contacted by an IT guy at a prepatory school about some BIG problems they're having. They have a 3Com WLAN. He is *emphatic* that these have NOTHING to do with the server Webpage issue that blew up and was fixed on Wednesday. I'll post the text, without identifying the guy (I encouraged him to check out Educause and this listserv, assuming he qualifies for membership...). If you contact me directly at john_...@nww.commailto:john_...@nww.com and want to reply to him directly, I'll coordinate the exchange... Here's his email: I would like to report some issues that appeared both prior to and after the widely publicized WiFi issues on iOS 6. I am a teacher in a school that went one-to-one Bring Your Own Device this year. We have 750 students each with a choice of device from Mac to PC to Android to iOS. With hundreds of students with iPhones and iPads, all connected to our school's WiFi network, we have been monitoring the development of WiFi issues on iOS devices. These issues are unrelated to Wednesday night's infamous Apple login page, which was resolved around 8pm EST that same night. Here is what we can confirm: 1. There is definitely an issue where iPhone 4S and iPad 3rd generation devices are unable to join network after updating to iOS 6 on some networks. We use 3COM business class access points, and I cannot give any more information on the model numbers. Needless to say it is wholly impractical to revert firmware on any of these machines just to deal with two devices. Each of these devices were fully capable of connecting while on iOS 5.1.1. As stated before, the network supports a wide range of devices. 2. I have several students who are reporting the issue with iPhone 4S or iPad 3. It is not just me. We are seeing this on EVERY device with an A5 chip that is updated to iOS 6 and connecting to our network. This is confirmed after 2 days of iOS 6. 3. I did a complete wipe of the iPad (3rd gen) at school and setup as a new iPad. Still unable to connect. 4. Resetting network settings, turning off cellular (of course, not all students have the cellular models), putting in airplane mode, clearing cache, turning off WiFi sync... These do not work. 5. Hard or soft resets do not work. 6. Devices that DO work when updated (and I say devices, because we have confirmed a number of these). iPhone 3GS, iPhone 4, iPod touch 4th gen, iPad 2. These all work fine. 7. Several schools in the Indianapolis area are also experiencing these issues on their network. We have even heard from a law firm that is having the same issue with company issued devices. 8. The iPad 3 works on my home network (Linksys router, WEP encryption). Another development: 1. iPhone 5 is connects to the school WiFi, but VERY slowly. It is much slower than my iPhone 3GS in loading web pages from anywhere. Obviously this info is very recent. 2. I haven't yet tested the iPhone 5 on my home network. My questions: 1. Can media outlets begin checking on this? It is very difficult when people report Wifi problems SOLVED without further investigation. 2. Since I cannot find information about this issue beyond suggestions to revert to older firmware on specific router model, is Apple aware of this as a serious issue with iOS 6? 3. And now the zinger: How quickly can we expect a software patch to this crippling issue? https://discussions.apple.com/message/19645276#19645276 https://discussions.apple.com/thread/4310542?start=210tstart=0 https://discussions.apple.com/message/19630995#19630995 https://discussions.apple.com/message/19633502#19633502 https://discussions.apple.com/thread/4313126?start=75tstart=0 https://discussions.apple.com/message/19651546#19651546 https://discussions.apple.com/message/19653365 https://discussions.apple.com/thread/4312579?start=15tstart=0 http://www.davejackson.com/life/cant-access-wifi-with-ios-6-on-iphone-with-netgear-wgt624v3-fix/ From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Hurt,Trenton W. Sent: Friday, September 21, 2012 1:48 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] iOS 6 Wireless Issues Is anyone seeing any other iOS 6 wifi issues? I have had a few iphones/ipads that where working fine on 5.1.1. Once upgraded they would no longer connect. The fix has been to reset all network settings. Thanks Trent From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU]mailto:[mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Bryan Sherwood Sent: Wednesday, September 19, 2012 8:54 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDUmailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] iOS 6 Wireless Issues We saw the same issue at our campus today, but it appears the page that Apple uses to check connectivity is now back up: http://www.apple.com/library/test/success.html
How is the surge in Wi-Fi equipped mobile devices impacting the WLAN?
Dear folks, At Interop, it was striking to repeatedly hear about the surge in Wi-Fi clients on WLANs, with one user often having several devices (smartphone, tablet, game console, and so on). It finally struck me that Higher Ed must be ground zero for this? Is this Wi-Fi client surge affecting your WLAN, or possibly other network services? And if so, how? (capacity or coverage issues? bandwidth management? IP addresses etc?) Is this growth causing you to rethink WLAN design/deployment? If so, how? Or is this all just hype from vendors flogging their products? Regards, John Cox __ J o h n C o x Senior Editor Main: 508.766.5301 | Direct: 508.766.5422 Office at home: 978-834-0554 NETWORKWORLD Maximize Your Return on IT 492 Old Connecticut Path | Framingham, MA 01701-9002 Mail: P.O. Box 9002, Framingham, MA 01701-9002 __ NetworkWorld.comhttp://www.networkworld.com/ | 2009 Media Guidehttp://www.networkworld.com/media/ | Conferences and Eventshttp://www.networkworld.com/events/ ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
Microsoft Exchange ActiveSync: issues, strengths/weaknesses?
Dear folks, I'm putting together a Network World story today on Exchange ActiveSync, specifically highlighting the differences in implementation by the various licensees (Apple, Google/Android, etc). Do any of you, who are Exchange shops, have some assessments, feedback, observations, complaints, complements on using ActiveSync, specifically for securing and managing mobile devices, and especially when they're using different operating systems? Have any of you switched from ActiveSync to a more robust mobile management infrastructure, possibly using Microsoft System Center Mobile Device Manager or some of the 3rd party tools like MobileIron? I'm looking for information/quotes I can use in my story; as usual, our preference is to identify people and schools fully, BUT I can offer not for attribution -- quotes are attributed to a generically specific title and a generic description of the school (large East Coast medical school etc). If you are willing and able to contribute, email me directly (or CC: your response to the listserv) to john_...@nww.commailto:john_...@nww.com Your comments posted ONLY to the listserv will be treated, as per listserv rules, confidentially. Thanks. Regards, John Cox __ J o h n C o x Senior Editor Main: 508.766.5301 | Direct: 508.766.5422 Office at home: 978-834-0554 NETWORKWORLD Maximize Your Return on IT 492 Old Connecticut Path | Framingham, MA 01701-9002 Mail: P.O. Box 9002, Framingham, MA 01701-9002 __ NetworkWorld.comhttp://www.networkworld.com/ | 2009 Media Guidehttp://www.networkworld.com/media/ | Conferences and Eventshttp://www.networkworld.com/events/ ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
Network World story on 802.11n one-year later....
Dear Stan, My editor has me researching a story for Monday's print issue on 802.11n trends in the market and the enterprise especially. A key part of the story is getting some feedback from large-scale 11n sites. I have a few details on Emory's recent 11n upgrade, based on our previous emails. At the risk of repetition, I was hoping to find out a bit more... - which vendor are you using for 11n? how many 11n APs you have installed, and how they're configured (1 or 2 radios, which bands, 20 or 40 MHz channels etc), and approximate number of 11n clients currently? - Do you see any notable changes between 11abg and 11n, apart from the bandwidth/throughput? - what kind of data rates and throughput are you getting typically from your 11n APs? Do you have a target or minimal throughput for users? - any changes you've made since the initial deployment -- tweaks, configuration changes, etc to optimize throughput or other changes? - were there any accompanying infrastructure changes -- such as 1-Gig Ethernet to the APs, changes in wiring-closet or other switches, new management or security approaches or changes? - how and with what products are you managing the WLAN? - any 11n best practices that your team has developed, which you'd be willing to share? Thanks for considering this request. If you prefer, we could talk briefly by phone on Thursday Regards, John Cox Senior Editor Network World ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
Apologies on the prior message....
I accidentally sent it to whole list. But...I'd love to hear from anyone deploying 11n, who has some data and experience to share! This is for Network World's Monday print issue. Regards, John Cox __ J o h n C o x Senior Editor Main: 508.766.5301 | Direct: 508.766.5422 Office at home: 978-834-0554 NETWORKWORLD Maximize Your Return on IT 492 Old Connecticut Path | Framingham, MA 01701-9002 __ NetworkWorld.comhttp://www.networkworld.com/ | 2009 Media Guidehttp://www.networkworld.com/media/ | Conferences and Eventshttp://www.networkworld.com/events/ ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
Thanks for the Group's help on the iPhone 4 2.4GHz story
My thanks to all who were willing to share their thoughts and comments on this issue, on- or off-line. The story is posted at NW's website, if you're interested: http://www.networkworld.com/news/2010/090710-iphone4-wifi-university.html And the comments are open. Regards, John Cox __ J o h n C o x Senior Editor Main: 508.766.5301 | Direct: 508.766.5422 Office at home: 978-834-0554 NETWORKWORLD Maximize Your Return on IT 492 Old Connecticut Path | Framingham, MA 01701-9002 __ NetworkWorld.comhttp://www.networkworld.com/ | 2009 Media Guidehttp://www.networkworld.com/media/ | Conferences and Eventshttp://www.networkworld.com/events/ ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
RE: [WIRELESS-LAN] Any issues with iPhone 4 and 2.4GHz 802.11n?
David, Thank you. Soso far: upgrading the AP infrastructure to 11n; the WLAN is open to anyone to connect; but no problems to date with 11n in the 2.4 GHz band for these clients (channel assignments/access; or IP address allocation). No authentication at all? I'm guessing the WLAN is firewalled from the admin/backend systems, and that students/whomevers would be accessing Web-based resources? Any analysis or impressions of the kind of traffic these 17K iOS devices are generating -- how much is video, data, etc? Regards, John Cox Senior Editor Network World From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:wireless-...@listserv.educause.edu] On Behalf Of David R. Morton Sent: Wednesday, August 25, 2010 11:43 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] Any issues with iPhone 4 and 2.4GHz 802.11n? John, We are just beginning our 802.11n migration, but to date we haven't seen anything that is causing concern. On the IP address side, our wifi network is open to any device to connect and access on-campus resources; so we do need to make sure that there are enough addresses available for them to connect. Based on our logs, we see approximately 71k unique devices (MAC addresses that have registered with our system) in a given 60 day period. Of those around 17k were identified as running iOS (based on the browser user agent string). Please let me know if you have any further questions David David Morton Director, Mobile Communication Strategies University of Washington dmor...@u.washington.edumailto:dmor...@u.washington.edu tel 206.221.7814 -- www.freshlymobile.com a fresh look at mobility -- On Aug 24, 2010, at 2:29 PM, j...@nww.commailto:j...@nww.com wrote: Thanks, David. I assume your WLAN is 11n? Do you mind telling me your vendor? 18,000 iOS devices?! Do you see any *potential* issues with, say, fairly high numbers of iPhone 4's concentrated in a given area of the WLAN? Also, someone raised the issue of IP address exhaustion (due in part, I think, to higher roaming/connecting/reconnecting) with smartphones and tablets. Are you seeing any issues around this? Regards, John Cox Senior Editor Network World From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:wireless-...@listserv.educause.edu] On Behalf Of David R. Morton Sent: Tuesday, August 24, 2010 11:37 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDUmailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] Any issues with iPhone 4 and 2.4GHz 802.11n? John, Yea Apple isn't always the best at providing detailed stats. The iPhone 4 does do .11n in the 2.4GHz space with a 1x1 antenna (at least as far as I've seen). There should be a bit of performance increase over the older models due to a few efficiencies with 11n. We haven't run any detailed tests ourselves, but so far haven't seen any real issues. Also I've published some of our wifi usage stats (including iPhone) to my blog at www.freshlymobile.comhttp://www.freshlymobile.com (click on UW Mobile stats at the top for the most recent look). Take care David David Morton Director, Mobile Communication Strategies University of Washington dmor...@u.washington.edumailto:dmor...@u.washington.edu tel 206.221.7814 -- www.freshlymobile.comhttp://www.freshlymobile.com a fresh look at mobility -- On Aug 24, 2010, at 8:03 AM, j...@nww.commailto:j...@nww.com wrote: Stan, What kind of 11n data rates and throughput are you seeing in the 2.4 band? Also, I think iPhone 4 has only a single Wi-Fi antenna, so it doesn't benefit (or benefit as much) as a 2x2 or 3x3 MIMO laptop. Have you done any i4 performance metrics? I'm trying to get 11n implementation details from Apple, but so far they've only referred me to the Web i4 spec sheet. Regards, John Cox Senior Editor Network World From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:wireless-...@listserv.educause.edu] On Behalf Of Brooks, Stan Sent: Tuesday, August 24, 2010 11:00 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDUmailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] Any issues with iPhone 4 and 2.4GHz 802.11n? John, At Emory University, we've just completed upgrading our ResHalls to 802.11n and are now working on our academic buildings as part of a system-wide upgrade to 802.11n. We've moved from single radio b/g APs to dual radio a/b/g/n APs. We are running 802.11n (backwards compatible to b/g) on our 2.4GHz radios, but without the 40MHz (high-throughput) channel plan. In fact I (and most wireless engineers) would advise against running 40MHz channels at 2.4GHz. We do run the 40MHz channels in the 5GHz band, however. That said, 802.11n with standard 20MHz channels does give
RE: [WIRELESS-LAN] Any issues with iPhone 4 and 2.4GHz 802.11n?
Stan, What kind of 11n data rates and throughput are you seeing in the 2.4 band? Also, I think iPhone 4 has only a single Wi-Fi antenna, so it doesn't benefit (or benefit as much) as a 2x2 or 3x3 MIMO laptop. Have you done any i4 performance metrics? I'm trying to get 11n implementation details from Apple, but so far they've only referred me to the Web i4 spec sheet. Regards, John Cox Senior Editor Network World From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:wireless-...@listserv.educause.edu] On Behalf Of Brooks, Stan Sent: Tuesday, August 24, 2010 11:00 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] Any issues with iPhone 4 and 2.4GHz 802.11n? John, At Emory University, we've just completed upgrading our ResHalls to 802.11n and are now working on our academic buildings as part of a system-wide upgrade to 802.11n. We've moved from single radio b/g APs to dual radio a/b/g/n APs. We are running 802.11n (backwards compatible to b/g) on our 2.4GHz radios, but without the 40MHz (high-throughput) channel plan. In fact I (and most wireless engineers) would advise against running 40MHz channels at 2.4GHz. We do run the 40MHz channels in the 5GHz band, however. That said, 802.11n with standard 20MHz channels does give marked improvement over 802.11b/g because of other dot11n technologies - multiple special streams, frame aggregation, etc. - Stan Brooks - CWNA/CWSP Emory University University Technology Services 404.727.0226 AIM/Y!/Twitter: WLANstan MSN: wlans...@hotmail.commailto:wlans...@hotmail.com GoogleTalk: wlans...@gmail.commailto:wlans...@gmail.com From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:wireless-...@listserv.educause.edu] On Behalf Of j...@nww.com Sent: Tuesday, August 24, 2010 10:08 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] Any issues with iPhone 4 and 2.4GHz 802.11n? Chris, Thanks. Your observation on 40Mhz limiting the channel options in 2.4 band fits with what I've learned also. As I mentioned in my direct reply, your email reminded me -- and I should have thought of this -- that of course the same 3-channel limitation exists for 11b/g iPhones. But...what I'm wondering is if the iPhone 4's demand or preference for 11n makes the situation more problematic, especially in a mixed-client environment -- when b/g iPhones are associating to the same 11n access point? Regards, John Cox Senior Editor Network World From: Chris Murphy [mailto:ch...@mit.edu] Sent: Monday, August 23, 2010 7:28 PM To: The EDUCAUSE Wireless Issues Constituent Group Listserv Cc: John Cox Subject: Re: [WIRELESS-LAN] Any issues with iPhone 4 and 2.4GHz 802.11n? John, I don't think there is much of an issue here, unless there is a requirement that the iPhone 4's need the bandwidth possible using 40Mhz channels. Just about every design guideline I've seen, and every conversation I've had with engineers at various networking companies, considers using 40Mhz channels at 2.4Ghz to be a bad idea, due to the loss of what little flexibility one has with channel layout as well as with adverse effects on neighboring networks in crowded areas (the anti-social effect), so here at least we never considered it. -Chris On Aug 23, 2010, at 9:12 AM, j...@nww.commailto:j...@nww.com j...@nww.commailto:j...@nww.com wrote: Folks, I was talking to a higher education IT guy last week; they have a lot of iPhones, and are rollling out iPhone 4's to new freshman and to faculty. As part of this, they upgraded the campus WLAN to 802.11n. BUT, after iPhone 4 was announced, they realized its 11n support was ONLY for the 2.4 GHz band (with of course only 3 non-overlapping channels, and tradeoffs if you merge two of them into one 40MHz channel). In SOME locations, they're having to do some fancy juggling of access points, channel and power settings. Juggling 3 channels in a crowded location clearly is NOT new. But the fact that this is occurring in 11n with a popular client device that often relies on WLAN access, seems noteworthy. I was wondering if anyone else is running into similar issues with iPhone 4 and 11n? I'm going to be writing this up as a Network World story today or early Tuesday. If you're interested in emailing/talking briefly with me about this, please just copy any listserv response to (or email me directly at) my NW email: john_...@nww.commailto:john_...@nww.com. Thanks! Regards, John Cox __ J o h n C o x Senior Editor Main: 508.766.5301 | Direct: 508.766.5422 Office at home: 978-834-0554 NETWORKWORLD Maximize Your Return on IT 492 Old Connecticut Path | Framingham, MA 01701-9002 __ NetworkWorld.comhttp://www.networkworld.com/ | 2009 Media Guidehttp://www.networkworld.com/media/ | Conferences and
RE: [WIRELESS-LAN] Any issues with iPhone 4 and 2.4GHz 802.11n?
Thanks, Chris. Any idea what kind of WLAN throughput your iPhone 4 clients are getting? Regards, John Cox Senior Editor Network World From: Chris Murphy [mailto:ch...@mit.edu] Sent: Tuesday, August 24, 2010 10:26 AM To: The EDUCAUSE Wireless Issues Constituent Group Listserv Cc: WIRELESS-LAN@listserv.educause.edu; John Cox Subject: Re: [WIRELESS-LAN] Any issues with iPhone 4 and 2.4GHz 802.11n? John, I think the only issue is that .11n devices will loose some performance having to share the band with .11g/b devices. Currently we run about a 50-50 split on the 2.4 band between .11n and .11g devices with no particular problems. -Chris On Aug 24, 2010, at 10:08 AM, j...@nww.commailto:j...@nww.com j...@nww.commailto:j...@nww.com wrote: Chris, Thanks. Your observation on 40Mhz limiting the channel options in 2.4 band fits with what I've learned also. As I mentioned in my direct reply, your email reminded me -- and I should have thought of this -- that of course the same 3-channel limitation exists for 11b/g iPhones. But…what I'm wondering is if the iPhone 4's demand or preference for 11n makes the situation more problematic, especially in a mixed-client environment -- when b/g iPhones are associating to the same 11n access point? Regards, John Cox Senior Editor Network World From: Chris Murphy [mailto:ch...@mit.edu] Sent: Monday, August 23, 2010 7:28 PM To: The EDUCAUSE Wireless Issues Constituent Group Listserv Cc: John Cox Subject: Re: [WIRELESS-LAN] Any issues with iPhone 4 and 2.4GHz 802.11n? John, I don't think there is much of an issue here, unless there is a requirement that the iPhone 4's need the bandwidth possible using 40Mhz channels. Just about every design guideline I've seen, and every conversation I've had with engineers at various networking companies, considers using 40Mhz channels at 2.4Ghz to be a bad idea, due to the loss of what little flexibility one has with channel layout as well as with adverse effects on neighboring networks in crowded areas (the anti-social effect), so here at least we never considered it. -Chris On Aug 23, 2010, at 9:12 AM, j...@nww.commailto:j...@nww.com j...@nww.commailto:j...@nww.com wrote: Folks, I was talking to a higher education IT guy last week; they have a lot of iPhones, and are rollling out iPhone 4's to new freshman and to faculty. As part of this, they upgraded the campus WLAN to 802.11n. BUT, after iPhone 4 was announced, they realized its 11n support was ONLY for the 2.4 GHz band (with of course only 3 non-overlapping channels, and tradeoffs if you merge two of them into one 40MHz channel). In SOME locations, they're having to do some fancy juggling of access points, channel and power settings. Juggling 3 channels in a crowded location clearly is NOT new. But the fact that this is occurring in 11n with a popular client device that often relies on WLAN access, seems noteworthy. I was wondering if anyone else is running into similar issues with iPhone 4 and 11n? I'm going to be writing this up as a Network World story today or early Tuesday. If you're interested in emailing/talking briefly with me about this, please just copy any listserv response to (or email me directly at) my NW email: john_...@nww.commailto:john_...@nww.com. Thanks! Regards, John Cox __ J o h n C o x Senior Editor Main: 508.766.5301 | Direct: 508.766.5422 Office at home: 978-834-0554 NETWORKWORLD Maximize Your Return on IT 492 Old Connecticut Path | Framingham, MA 01701-9002 __ NetworkWorld.comhttp://www.networkworld.com/ | 2009 Media Guidehttp://www.networkworld.com/media/ | Conferences and Eventshttp://www.networkworld.com/events/ ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found athttp://www.educause.edu/groups/. === Chris Murphy Network Engineer MIT Information Services Technology Room W92-191 77 Massachusetts Avenue Cambridge, MA 02139 ch...@mit.edumailto:ch...@mit.edu ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
RE: [WIRELESS-LAN] Any issues with iPhone 4 and 2.4GHz 802.11n?
Thanks, Stan. Congrats on the weekend's success! Regards, John Cox Senior Editor Network World From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:wireless-...@listserv.educause.edu] On Behalf Of Brooks, Stan Sent: Tuesday, August 24, 2010 11:28 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] Any issues with iPhone 4 and 2.4GHz 802.11n? Good point, John. The iPhone is only a 1x1 MiMo, so no special stream boost. There is still the reduced guard time and frame aggregation that will give better performance compared to 802.11b/g. I'm still digging out from (a very successful) Back-to-School weekend, but we are seeing approximately 1/3 of our total ResNet users running 802.11n in 5GHz, 1/3 running 802.11n in 2.4GHz, and 1/3 running 802.11g. I don't have any breakout for the iPhones specifically but can say that iDevices (iPads, iPhones, iPod Touches) accounted for a little over 8% or our total clients registered over the weekend. - Stan Brooks - CWNA/CWSP Emory University University Technology Services 404.727.0226 AIM/Y!/Twitter: WLANstan MSN: wlans...@hotmail.commailto:wlans...@hotmail.com GoogleTalk: wlans...@gmail.commailto:wlans...@gmail.com From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:wireless-...@listserv.educause.edu] On Behalf Of j...@nww.com Sent: Tuesday, August 24, 2010 11:04 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] Any issues with iPhone 4 and 2.4GHz 802.11n? Stan, What kind of 11n data rates and throughput are you seeing in the 2.4 band? Also, I think iPhone 4 has only a single Wi-Fi antenna, so it doesn't benefit (or benefit as much) as a 2x2 or 3x3 MIMO laptop. Have you done any i4 performance metrics? I'm trying to get 11n implementation details from Apple, but so far they've only referred me to the Web i4 spec sheet. Regards, John Cox Senior Editor Network World From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:wireless-...@listserv.educause.edu] On Behalf Of Brooks, Stan Sent: Tuesday, August 24, 2010 11:00 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] Any issues with iPhone 4 and 2.4GHz 802.11n? John, At Emory University, we've just completed upgrading our ResHalls to 802.11n and are now working on our academic buildings as part of a system-wide upgrade to 802.11n. We've moved from single radio b/g APs to dual radio a/b/g/n APs. We are running 802.11n (backwards compatible to b/g) on our 2.4GHz radios, but without the 40MHz (high-throughput) channel plan. In fact I (and most wireless engineers) would advise against running 40MHz channels at 2.4GHz. We do run the 40MHz channels in the 5GHz band, however. That said, 802.11n with standard 20MHz channels does give marked improvement over 802.11b/g because of other dot11n technologies - multiple special streams, frame aggregation, etc. - Stan Brooks - CWNA/CWSP Emory University University Technology Services 404.727.0226 AIM/Y!/Twitter: WLANstan MSN: wlans...@hotmail.commailto:wlans...@hotmail.com GoogleTalk: wlans...@gmail.commailto:wlans...@gmail.com From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:wireless-...@listserv.educause.edu] On Behalf Of j...@nww.com Sent: Tuesday, August 24, 2010 10:08 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] Any issues with iPhone 4 and 2.4GHz 802.11n? Chris, Thanks. Your observation on 40Mhz limiting the channel options in 2.4 band fits with what I've learned also. As I mentioned in my direct reply, your email reminded me -- and I should have thought of this -- that of course the same 3-channel limitation exists for 11b/g iPhones. But...what I'm wondering is if the iPhone 4's demand or preference for 11n makes the situation more problematic, especially in a mixed-client environment -- when b/g iPhones are associating to the same 11n access point? Regards, John Cox Senior Editor Network World From: Chris Murphy [mailto:ch...@mit.edu] Sent: Monday, August 23, 2010 7:28 PM To: The EDUCAUSE Wireless Issues Constituent Group Listserv Cc: John Cox Subject: Re: [WIRELESS-LAN] Any issues with iPhone 4 and 2.4GHz 802.11n? John, I don't think there is much of an issue here, unless there is a requirement that the iPhone 4's need the bandwidth possible using 40Mhz channels. Just about every design guideline I've seen, and every conversation I've had with engineers at various networking companies, considers using 40Mhz channels at 2.4Ghz to be a bad idea, due to the loss of what little flexibility one has with channel layout as well as with adverse effects on neighboring networks in crowded areas (the anti-social effect), so here at least we never considered it. -Chris On Aug 23, 2010, at 9:12 AM, j...@nww.commailto:j...@nww.com j...@nww.commailto:j...@nww.com wrote: Folks, I was talking to a higher
RE: [WIRELESS-LAN] Any issues with iPhone 4 and 2.4GHz 802.11n?
Thanks, David. I assume your WLAN is 11n? Do you mind telling me your vendor? 18,000 iOS devices?! Do you see any *potential* issues with, say, fairly high numbers of iPhone 4's concentrated in a given area of the WLAN? Also, someone raised the issue of IP address exhaustion (due in part, I think, to higher roaming/connecting/reconnecting) with smartphones and tablets. Are you seeing any issues around this? Regards, John Cox Senior Editor Network World From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:wireless-...@listserv.educause.edu] On Behalf Of David R. Morton Sent: Tuesday, August 24, 2010 11:37 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] Any issues with iPhone 4 and 2.4GHz 802.11n? John, Yea Apple isn't always the best at providing detailed stats. The iPhone 4 does do .11n in the 2.4GHz space with a 1x1 antenna (at least as far as I've seen). There should be a bit of performance increase over the older models due to a few efficiencies with 11n. We haven't run any detailed tests ourselves, but so far haven't seen any real issues. Also I've published some of our wifi usage stats (including iPhone) to my blog at www.freshlymobile.comhttp://www.freshlymobile.com (click on UW Mobile stats at the top for the most recent look). Take care David David Morton Director, Mobile Communication Strategies University of Washington dmor...@u.washington.edumailto:dmor...@u.washington.edu tel 206.221.7814 -- www.freshlymobile.com a fresh look at mobility -- On Aug 24, 2010, at 8:03 AM, j...@nww.commailto:j...@nww.com wrote: Stan, What kind of 11n data rates and throughput are you seeing in the 2.4 band? Also, I think iPhone 4 has only a single Wi-Fi antenna, so it doesn't benefit (or benefit as much) as a 2x2 or 3x3 MIMO laptop. Have you done any i4 performance metrics? I'm trying to get 11n implementation details from Apple, but so far they've only referred me to the Web i4 spec sheet. Regards, John Cox Senior Editor Network World From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:wireless-...@listserv.educause.edu] On Behalf Of Brooks, Stan Sent: Tuesday, August 24, 2010 11:00 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDUmailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] Any issues with iPhone 4 and 2.4GHz 802.11n? John, At Emory University, we've just completed upgrading our ResHalls to 802.11n and are now working on our academic buildings as part of a system-wide upgrade to 802.11n. We've moved from single radio b/g APs to dual radio a/b/g/n APs. We are running 802.11n (backwards compatible to b/g) on our 2.4GHz radios, but without the 40MHz (high-throughput) channel plan. In fact I (and most wireless engineers) would advise against running 40MHz channels at 2.4GHz. We do run the 40MHz channels in the 5GHz band, however. That said, 802.11n with standard 20MHz channels does give marked improvement over 802.11b/g because of other dot11n technologies - multiple special streams, frame aggregation, etc. - Stan Brooks - CWNA/CWSP Emory University University Technology Services 404.727.0226 AIM/Y!/Twitter: WLANstan MSN: wlans...@hotmail.commailto:wlans...@hotmail.com GoogleTalk: wlans...@gmail.commailto:wlans...@gmail.com From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:wireless-...@listserv.educause.edu] On Behalf Of j...@nww.commailto:j...@nww.com Sent: Tuesday, August 24, 2010 10:08 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDUmailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] Any issues with iPhone 4 and 2.4GHz 802.11n? Chris, Thanks. Your observation on 40Mhz limiting the channel options in 2.4 band fits with what I've learned also. As I mentioned in my direct reply, your email reminded me -- and I should have thought of this -- that of course the same 3-channel limitation exists for 11b/g iPhones. But...what I'm wondering is if the iPhone 4's demand or preference for 11n makes the situation more problematic, especially in a mixed-client environment -- when b/g iPhones are associating to the same 11n access point? Regards, John Cox Senior Editor Network World From: Chris Murphy [mailto:ch...@mit.edu] Sent: Monday, August 23, 2010 7:28 PM To: The EDUCAUSE Wireless Issues Constituent Group Listserv Cc: John Cox Subject: Re: [WIRELESS-LAN] Any issues with iPhone 4 and 2.4GHz 802.11n? John, I don't think there is much of an issue here, unless there is a requirement that the iPhone 4's need the bandwidth possible using 40Mhz channels. Just about every design guideline I've seen, and every conversation I've had with engineers at various networking companies, considers using 40Mhz channels at 2.4Ghz to be a bad idea, due to the loss of what little flexibility one has with channel layout as well
Any issues with iPhone 4 and 2.4GHz 802.11n?
Folks, I was talking to a higher education IT guy last week; they have a lot of iPhones, and are rollling out iPhone 4's to new freshman and to faculty. As part of this, they upgraded the campus WLAN to 802.11n. BUT, after iPhone 4 was announced, they realized its 11n support was ONLY for the 2.4 GHz band (with of course only 3 non-overlapping channels, and tradeoffs if you merge two of them into one 40MHz channel). In SOME locations, they're having to do some fancy juggling of access points, channel and power settings. Juggling 3 channels in a crowded location clearly is NOT new. But the fact that this is occurring in 11n with a popular client device that often relies on WLAN access, seems noteworthy. I was wondering if anyone else is running into similar issues with iPhone 4 and 11n? I'm going to be writing this up as a Network World story today or early Tuesday. If you're interested in emailing/talking briefly with me about this, please just copy any listserv response to (or email me directly at) my NW email: john_...@nww.commailto:john_...@nww.com. Thanks! Regards, John Cox __ J o h n C o x Senior Editor Main: 508.766.5301 | Direct: 508.766.5422 Office at home: 978-834-0554 NETWORKWORLD Maximize Your Return on IT 492 Old Connecticut Path | Framingham, MA 01701-9002 __ NetworkWorld.comhttp://www.networkworld.com/ | 2009 Media Guidehttp://www.networkworld.com/media/ | Conferences and Eventshttp://www.networkworld.com/events/ ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
FYI: Security consultant talks about Cisco wireless vulnerabilities
Dear folks, This may be something you're already familiar with. But I'm passing it on for what it's worth Someone just sent me this link, to a ZDnet story apparently reporting on a presentation at BlackHat/Europe conference. http://www.zdnet.co.uk/news/security-threats/2010/04/16/security-researchers-demo-cisco-wi-fi-flaws-40088653/?tag=mncol;txt BUT don't click on that yet! The story ABOUT the presentation seems a big dicey to me. (A better one -- based on a quick skim -- seems to be this story at DarkReading, which interviewed the presenter, Enno Rey, before BlackHat http://www.darkreading.com/vulnerability_management/security/perimeter/showArticle.jhtml?articleID=224202409.) I've done some additional digging, and I think the same team presented the same material at the recent SchmooCon. Here's the SchmooCon video: http://www.ustream.tv/recorded/4500990 FYI, here's the link to the capsule BlackHat session summary and the presenters: http://www.blackhat.com/html/bh-eu-10/bh-eu-10-briefings.html The presenter in both is Enno Rey, with ERNW GmbH, based in Germany. Their English language website is here http://ernw.de/content/e15/e26/index_eng.html Rey mentions an infosec blog: http://www.insinuator.net/ I've only checked the opening minutes of the video. Rey is looking at 2 Cisco WLAN architecturs -- SWAN and the current CUWN. Apparently a big part of the presentation is potential problems in the Cisco's proprietary Wireless LAN Context Control Protocol (WLCCP). There you goI'll pull this together for a blogpost http://www.networkworld.com/community/blog/2989 at Network World later today. Unless you all tell me this was old news from 2 years ago or something Regards, John Cox __ J o h n C o x Senior Editor Main: 508.766.5301 | Direct: 508.766.5422 Office at home: 978-834-0554 NETWORKWORLD Maximize Your Return on IT 492 Old Connecticut Path | Framingham, MA 01701-9002 __ NetworkWorld.comhttp://www.networkworld.com/ | 2009 Media Guidehttp://www.networkworld.com/media/ | Conferences and Eventshttp://www.networkworld.com/events/ ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
iPhone 3.1 breaking Exchange sync?
A number of news stories, such as this one from Infoworld http://www.infoworld.com/d/mobilize/apple-betrays-iphones-business-hopes-723, note that Apple fixed a big but unacknowledged bug in the iPhone OS, but doing so means that earlier iPhone models can no longer sync with Exchange 2007 servers that require on-device encryption. Are you folks seeing this? And, if so, how are you responding? Any workarounds? Any word from Apple? As a reporter for Network World, I'm also looking for direct IT comments. Please feel free to copy or directly mail my NW account: john_...@nww.commailto:john_...@nww.com. Thanks. regards, John Cox senior editor Network World www.networkworld.comhttp://www.networkworld.com ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
How is 802.11n changing the campus? Or is it?
As a reporter for Network World, I'm putting together this week a package of stories in anticipation of the expected all-but-final ratification of the 802.11n standard by week's end. Campuses have been leading the way both in large-scale WLAN adoption in general and in 11n in particular (the draft 2 of the standard). I'd like to leverage that experience for the stories I'm researching, as well as spark some worthwhile discussion on the listserv. Is 11n changing the campus, and if so how? One issue that's already come up is the matter of the growing percentage of unused wired Ethernet ports, and the question of whether to continue with the traditional pattern of wired edge access investments (or perhaps WHEN to discontinue it, and to what degree?). But are their other changes happening, both in the IT infrastructure and in user behaviours -- the way students/faculty/staff are using the network, and the kind of applications they run over it? Is 11n accelerating adoption of other technologies, such 802.1x, expanded gigabit Ethernet infrastructure, endpoint security, or others? Are you finding issues or challenges with 11n that you haven't with 11abg? For example, there's evidence that 11n's propagation seems less predictable than abg. Has migrating to 11n met your expectations for performance or coverage or both? Or other institutional goals? As part of my 11n content package, I'm hoping to get feedback from a group of college/university IT folks, who've been working with the draft 2 11n gear for awhile, perhaps creating either a best practices or practical tips listing for other readers. So, while I'm hoping that this post will lead to some listserv comments, if you're interested in passing on some advice, suggestions, tips, then please feel free to contact me directly at john_...@nww.commailto:john_...@nww.com, to into a bit more detail, either via email or a phone call. Thanks for this opportunity to post here. Regards, John Cox __ J o h n C o x Senior Editor Main: 508.766.5301 | Direct: 508.766.5422 Office at home: 978-834-0554 NETWORKWORLD Maximize Your Return on IT 492 Old Connecticut Path | Framingham, MA 01701-9002 __ NetworkWorld.comhttp://www.networkworld.com/ | 2009 Media Guidehttp://www.networkworld.com/media/ | Conferences and Eventshttp://www.networkworld.com/events/ ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
