Re: [WIRELESS-LAN] RF interference from 802.11
The light on a Cisco lightweight access point can be turned off via the command-line. We've done this on the few APs we installed in a local theater we own. (Of course, you could just prime and paint over the light.) Barron Barron Hulver Director of Networking, Operations, and Systems Center for Information Technology Oberlin College 148 West College Street Oberlin, OH 44074 440-775-8702 http://www2.oberlin.edu/staff/bhulver/ On 6/5/13 9:29 AM, Chanowski, John wrote: Because APs are a source of ... potentially light, we have had requests from our Physics and Astronomy Departments that APs not be placed in certain ... dark areas -Original Message- From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Julian Y Koh Sent: Tuesday, June 04, 2013 5:23 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: [WIRELESS-LAN] RF interference from 802.11 Has anyone had to deal with researchers claiming that 802.11 RF causes interference with their laboratory experiments and apparatus? We're getting rumblings out of our Physics department - they are trying to prevent APs from getting installed in their area because of what they say are highly sensitive devices that will be adversely affected. My personal opinion iswell, I'll withhold that for now. Anyone gone through this? Thanks in advance! ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
Re: [WIRELESS-LAN] RF interference from 802.11
The faculty in our Physics department had concerns as well as one researcher in Chemistry. Per agreement, we installed wireless in the same manner as anywhere else on campus but we turned the power down very low (Cisco 3502i lightweight access points with power level 5 in the 2.4 GHz range) near designated lab areas. We've had it this way for several years without any complaints from users or faculty. If you are using Cisco Clean Air or the equivalent, I suppose you might argue that if the APs cannot see the lab equipment then the lab equipment should not be affected by the APs. Barron Barron Hulver Director of Networking, Operations, and Systems Center for Information Technology Oberlin College 148 West College Street Oberlin, OH 44074 440-775-8702 http://www2.oberlin.edu/staff/bhulver/ On 6/4/13 5:22 PM, Julian Y Koh wrote: Has anyone had to deal with researchers claiming that 802.11 RF causes interference with their laboratory experiments and apparatus? We're getting rumblings out of our Physics department - they are trying to prevent APs from getting installed in their area because of what they say are highly sensitive devices that will be adversely affected. My personal opinion iswell, I'll withhold that for now. Anyone gone through this? Thanks in advance! ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
Re: [WIRELESS-LAN] Wow vision veos: Will products using Miracast be an alternative?
Will products using Miracast take hold and be an alternative? http://www.wi-fi.org/wi-fi-certified-miracast%E2%84%A2 Barron Barron Hulver Director of Networking, Operations, and Systems Center for Information Technology Oberlin College 148 West College Street Oberlin, OH 44074 440-775-8702 http://www2.oberlin.edu/staff/bhulver/ On 5/24/13 10:23 PM, Jeff Kell wrote: I guess the $64K question is... Is this more viable than Bonjour/AppleTV ? We're desperately seeking an alternative to the growing tide that wants just that... Jeff On 5/24/2013 10:18 PM, Walter Reynolds wrote: We talked to a re-seller today and were underwhelmed by this. There is no Android client currently. The iPad/iPhone app seemed very limited in its capabilities and the list price on the mini was about 5K Walter Reynolds Principal Systems Security Development Engineer Information and Technology Services University of Michigan (734) 615-9438 On Fri, May 24, 2013 at 5:18 PM, Merideth Drudge merid...@saintmarys.edu mailto:merid...@saintmarys.edu wrote: Trent, I have not heard of any performance issues, but this classroom is rather small (for 20 students or so). Also, I think that much of the screen sharing is over the wired network, from the iMacs that are already in the room. Unfortunately, I don't have the equipment on hand for spectrum analysis, but I'll take a look at the system next week and see what kind of usage information I can find out. Thanks, Merideth On Wed, May 22, 2013 at 8:30 PM, Hurt,Trenton W. trent.h...@louisville.edu mailto:trent.h...@louisville.edu wrote: So when it does the sharing of the screen to the projector did you notice any performance hit to the existing enterprise wireless that you have deployed in that area? If possible can you get a spectrum capture to see the rf utilization, etc. I’m very concerned that this display mirroring could really cause issues in some of my large classrooms where the rf is already being taxed heavily from client usage. Thanks Trent *From:*The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] *On Behalf Of *Merideth Drudge *Sent:* Wednesday, May 22, 2013 7:46 PM *To:* WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU *Subject:* Re: [WIRELESS-LAN] Wow vision veos We implemented one of these VEOS units in a classroom last fall. It's pretty neat, but I found the emphasis on wireless to be misleading. The unit itself does not have wireless; it connects to your network via wired ethernet. I think the point is that wireless laptops can visit the VEOS unit via http and download the client, and then a student or guest can then share their screen over the projector. As long as wireless clients can get to the IP address given to the VEOS, then there is no configuration on the network. I hope that this helps. Thanks, Merideth On Wed, May 22, 2013 at 7:01 PM, Peter P Morrissey ppmor...@syr.edu mailto:ppmor...@syr.edu wrote: No, but it looks very cool. I would be curious how compatible it is with existing wireless deployments. Pete M. *From:*The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] *On Behalf Of *Hurt,Trenton W. *Sent:* Wednesday, May 22, 2013 6:37 PM *To:* WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU *Subject:* [WIRELESS-LAN] Wow vision veos Has anyone tried these in their classrooms? http://www.wow-vision.com/products/veos Trenton Hurt, CWNA, CWSP, CCNP(W), CCNA(W), CCNA(V), CCNA(R/S) Wireless Network Administrator University of Louisville Phone (502) 852-1513 tel:%28502%29%20852-1513 FAX (502) 852-1424 tel:%28502%29%20852-1424 ** 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] Cisco Unified Wireless Release
On a related note, I've discovered a blog (http://revolutionwifi.blogspot.com/2011/07/cisco-live-2011-wireless-security-recap.html) that claims the Cisco 4400 series controllers will not be supported beginning with version 7.2. Can anyone confirm this? Barron Barron Hulver Director of Networking, Operations, and Systems Center for Information Technology Oberlin College 148 West College Street Oberlin, OH 44074 440-775-8702 http://www2.oberlin.edu/staff/bhulver/ On 11/9/11 9:44 AM, Mike King wrote: Just got notification of a new Software release on the WLC for Cisco. I checked the website, and it looks like two releases were shipped out. http://www.cisco.com/en/US/products/ps10315/prod_release_notes_list.html 7.0.220.0 and 7.1.91.0 Interesting points to notice, 7.0.220.0 is the end of the road for: AIR-LAP1121 AIR-AP1220A AIR-AP1220B AIR-AP1230A AIR-AP1230B AIR-LAP1231G AIR-LAP1232AG It's one of the shortest Open Cavet sections I've seen: http://www.cisco.com/en/US/docs/wireless/controller/release/notes/crn7_1_91_0.html#wp846080 Granted, it may get longer as people upgrade to it. ** 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] KeyNote Remote on Cisco LWAPP
I'm sure it is using Apple's Bonjour protocol which relies on multicasting to work on the local network. We've discussed this internally but have decided not to enable multicast on wireless yet. For a deep dive, consider the following book: Zero Configuration Networking: The Definitive Guide [Paperback] Daniel Steinberg (Author), Stuart Cheshire (Author) Paperback: 226 pages Publisher: O'Reilly Media; 1 edition (December 20, 2005) Language: English ISBN-10: 0596101007 If you are a registered Apple developer, see the WWDC 2011 session 211 video. Barron Barron Hulver Director of Networking, Operations, and Systems Center for Information Technology Oberlin College 148 West College Street Oberlin, OH 44074 440-775-8798 http://www2.oberlin.edu/staff/bhulver/ On 10/10/11 3:03 PM, Scott Powell wrote: I have a professor trying to use their iPod to remotely control their iPad in the classroom. It works fine on a test Netgear wireless router I have for testing. However it does not work on any of the WLANs I have configured for campus use. Doing a little research, it appears that this application requires multicast to be enabled? I currently do not have multicast enabled. Does anyone have experience with this? Any solutions that don't require enabling multicast? Thank you. Scott Powell Director, IT Infrastructure Support Wittenberg University 937-525-3821 937-327-7372 fax www.wittenberg.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] off-topic: does anyone do voip ?
I'm also interested in what people are doing with VoIP. Barron Barron Hulver Director of Networking, Operations, and Systems Center for Information Technology Oberlin College 148 West College Street Oberlin, OH 44074 440-775-8798 http://www2.oberlin.edu/staff/bhulver/ ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
Re: [WIRELESS-LAN] AP Enclosure
We install access points with integrated antennas in hallways without enclosures. I think we have had only one (minor) incident since I've been here (5 years). Barron Barron Hulver Director of Networking, Operations, and Systems Center for Information Technology Oberlin College 148 West College Street Oberlin, OH 44074 440-775-8798 http://www2.oberlin.edu/staff/bhulver/ ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
Re: [WIRELESS-LAN] iPad spontaneous reboots?
I haven't heard about about any iPads rebooting due to wireless, but I have two thoughts: 1) Is it rebooting periodically? If so, is it really just disconnecting from the wireless network periodically? (Google wireless disconnects after 30 minutes and you will find quite a few hits). One of my people, Nathan Broome, found that we had a client disconnect parameter set to 30 minutes. This setting was probably just carried forward from a Cisco default setting from many years ago. You can disable the setting in the Cisco Wireless LAN Controller by going to WLANs - WLAN ID - Advanced and unchecking Enable Session Timeout. 2) Set up a non-broadcast SSID on another subnet and have one of the people who have the problem use this SSID. This might help to determine if the problem is with RF interference or some network traffic that is taking out the iPad. If the iPad is rebooting due to traffic then you could set up a continuous packet capture and try to find the packet that is taking out the iPad. I worked with my staff to set up a non-broadcast SSID here and I find it useful now and then. Barron Barron Hulver Director of Networking, Operations, and Systems Center for Information Technology Oberlin College 148 West College Street Oberlin, OH 44074 440-775-8798 http://www2.oberlin.edu/staff/bhulver/ Has anyone heard about iPads suddenly rebooting on their own? We are hearing reports of this, and of course they are connected to our network when it is happening, so it is the network causing it. Just wondering if anyone else has heard this. Thanks, Pete Morrissey Syracuse University ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
Re: [WIRELESS-LAN] Wireless Planning
I agree with others that density is important. While we believe the wireless in our main library has good coverage, we are in the process of adding some additional access points in some areas for performance reasons. As a hedge, in some areas you may want to consider running two cables to each access point and leaving 30' of slack at each AP. You could then easily deploy more access points in the future if needed. Barron Barron Hulver Director of Networking, Operations, and Systems Center for Information Technology Oberlin College 148 West College Street Oberlin, OH 44074 440-775-8798 http://www2.oberlin.edu/staff/bhulver/ ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
Any experiences with Cisco 3500-series CleanAir access points?
Does anyone have any experiences with the Cisco 3500-series CleanAir access points? We have a small project (about 40 access points) coming up and I'm thinking about deploying these as a pilot instead of the 1142s that we would normally deploy. I've discussed this will one of my people who handles our wireless deployments (Art Ripley) and he thinks we should. For background, we have most of the campus covered in wireless and a couple of years ago we started deploying for performance instead of coverage (more access points per square foot). We have nine Cisco WLCs (a mix of 4404-100s and 5508s) and a mix of 1131 and 1142 access points. We do not use WCS. Instead, we (Nathan Broome and I) have developed our own wireless management software. This has worked well for us but I'm wondering if I should move to an off-the-shelf package when deploying the 3500s. Any thoughts on this? I've arranged a meeting with our local Cisco sales office next week and this will be one of the topics I want to discuss. Thanks, Barron Barron Hulver Director of Networking, Operations, and Systems Center for Information Technology Oberlin College 148 West College Street Oberlin, OH 44074 440-775-8798 http://www2.oberlin.edu/staff/bhulver/ ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
Re: [WIRELESS-LAN] Wireless Printers/Wi-Fi Direct, couple of other devices
For the thread citing counts of devices, I'm sure it comes as no surprise to this group that smart phones will continue to take over market share from traditional cell phones. Here is an interesting research report from Morgan Stanley last year: http://www.morganstanley.com/institutional/techresearch/pdfs/Internet_Trends_041210.pdf Barron Barron Hulver Director of Networking, Operations, and Systems Center for Information Technology Oberlin College 148 West College Street Oberlin, OH 44074 440-775-8798 barron.hul...@oberlin.edu http://www2.oberlin.edu/staff/bhulver/ Original Message Subject: Re: [WIRELESS-LAN] Wireless Printers/Wi-Fi Direct, couple of other devices Date: Wed, 16 Feb 2011 13:59:34 -0800 From: David Morton dmor...@u.washington.edu Reply-To: The EDUCAUSE Wireless Issues Constituent Group Listserv WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU FYI, we have roughly: 12,977 iPhones 8,783 iPod touches 3,880 Androids 1,852 iPads 338 Win Mobile 804 Blackberry 330 Symbian 19 Palm OS You can see more stats at www.freshlymobile.com We gather these stats from our wifi registration system. It looks at the browser user agent when they register. David ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
Re: [WIRELESS-LAN] Help on remote sensor data capturing
I agree it was meant for low power and short ranges. But it looks like there are now products on the market that can go much further. http://www.eetimes.com/electronics-products/analog-products/4114855/WIRELESS-RF-ZigBee-wireless-sensor-networks-extend-range-to-40-km http://www.libelium.com/products/waspmote/hardware Barron On 9/23/10 5:22 AM, Osborne, Bruce W wrote: According to my research , zigbee (802.15.4) is a mesh topology restricted to 1mW maximum. It is meant for short ranges, but farther than Bluetooth. Our school is currently evaluating zigbee wireless thermostats for HVAC management. Bruce Osborne Network Engineer - Wireless NAC Liberty University From: Barron Hulver [barron.hul...@oberlin.edu] Sent: Wednesday, September 22, 2010 10:47 PM Subject: Re: Help on remote sensor data capturing I don't have any experience with this, but you might look into zigbee or 802.15.4. e.g. http://www.jdlsolutions.com/CSeriesWirelessSensors.asp#C430HTMP Barron Barron Hulver Director of Networking, Operations, and Systems Center for Information Technology Oberlin College 148 West College Street Oberlin, OH 44074 440-775-8798 barron.j.hul...@oberlin.edu http://www2.oberlin.edu/staff/bhulver/ On 9/22/10 6:26 PM, Manuel Amaral wrote: I'm hoping someone can help identify some reasonable ideas for this. One of our faculty members is working on a project where he needs to collect remote environmental data. He needs to capture temperature and humidity readings at an outdoor location, with no power, roughly 1500 feet from campus. Ideally, he'd like to be able to transmit the data back to campus wirelessly at least once a day where the data can be stored and made accessible via a website. And he'd like to keep the costs relatively low. Has anyone had any experience with something like this? Manny --- Manuel (Manny) Amaral Associate Director, Information Technology Franklin W. Olin College of Engineering Direct: 781-292-2433 ** 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] Help on remote sensor data capturing
I don't have any experience with this, but you might look into zigbee or 802.15.4. e.g. http://www.jdlsolutions.com/CSeriesWirelessSensors.asp#C430HTMP Barron Barron Hulver Director of Networking, Operations, and Systems Center for Information Technology Oberlin College 148 West College Street Oberlin, OH 44074 440-775-8798 barron.j.hul...@oberlin.edu http://www2.oberlin.edu/staff/bhulver/ On 9/22/10 6:26 PM, Manuel Amaral wrote: I'm hoping someone can help identify some reasonable ideas for this. One of our faculty members is working on a project where he needs to collect remote environmental data. He needs to capture temperature and humidity readings at an outdoor location, with no power, roughly 1500 feet from campus. Ideally, he'd like to be able to transmit the data back to campus wirelessly at least once a day where the data can be stored and made accessible via a website. And he'd like to keep the costs relatively low. Has anyone had any experience with something like this? Manny --- Manuel (Manny) Amaral Associate Director, Information Technology Franklin W. Olin College of Engineering Direct: 781-292-2433 ** 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/.
[Fwd: [WIRELESS-LAN] Cisco Aironet without WEP and DHCP Problem]
We had a problem exactly like this and we eventually solved it. The key is to monitor the ARP table on the 4404 to see if any addresses are oscillating among interfaces (should not be happening). In our case we found addresses were oscillating and the 4404 was using a port that was plugged into a network switch but admin'ed down on the 4404. The quick answer is to make sure any interfaces that you are not using on the 4404 are not plugged into a network switch port. Barron Barron Hulver Director of Networking, Operations, and Systems Center for Information Technology Oberlin College Oberlin, OH 44074 Original Message Subject:[WIRELESS-LAN] Cisco Aironet without WEP and DHCP Problem Date: Thu, 4 Jun 2009 10:03:51 -0300 From: Alexandre Bastos abas...@unifor.br Reply-To: The EDUCAUSE Wireless Issues Constituent Group Listserv WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU I'm Sysadmin on University of Fortaleza, a medium-sized university (around 25,000 students), located on Northeast of Brazil. Our Lan e Wlan are based on Cisco devices. But now, we are experiencing some strange behavior on our Wireless network. Here, we deployed a simple wireless environment, since our needed are very simple: just permit internet access to academic community from all places in the campus. So, we bought AP Aironet 1100 and 1200 series and put it on strategic places on each build. Ok, it was simple. Coverage area Ok! :). But now, I'm investigating a strange situation: the client connect on the wlan (without WEP/WPA, etc), but it cannot receive a IP Address from DHCP Server. I checked my core switch, edge switches, my dhcp server (a linux box), re-certified the cables that connect AP to edge switch, change DHCP Server from Linux box to MS DHCP Server, and back to linux again.. etc etc ... without successful The problem don't have a specific period, or specific location or any relation with some event. Just the clients cannot connect on WLan (in fact, they connect, but don't receive a ip address). On my dhcp server log, I saw the DHCP DISCOVER packet from client, and the DHCP OFFER, from my DhcpServer to client. If I restart access-point, the problem is temporary solved. (Look, this strange behavior occurs with all 1100 and 1200 AP's, on different time, on different days, without a logical order). Did anyone experienced any problem like this during the deployment of Wlan environment ? Unfortunately our Cisco partner just limited to sell and deliver the equipment Sorry about my bad English, and my long post Best Regards -- Alexandre Bastos -- Fundação Edson Queiroz Universidade de Fortaleza Gerência em Tecnologia da Informação - GTI ** 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/.
...Any opinions on the Cisco 5508 WLC?
We have six Cisco 4404-100 wireless LAN controllers using 5.2.178.0 software and are in the process of purchasing another WLC. Cisco has just released the 5508 controller so I'm wondering if anyone has used this yet and, if so, what comments you have. http://www.cisco.com/en/US/products/ps10315/index.html Barron Barron Hulver Director of Networking, Operations, and Systems Center for Information Technology Oberlin College Oberlin, OH 44074 ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
Re: [WIRELESS-LAN] Mac OSX and 5Ghz
Have you considered defining another SSID for high-speed wireless communications? We use the Cisco 4404-100 Wireless LAN Controller solution with 5.1.151.0 code and it allows us to set a radio policy of 802.11a only (and apparently 5 ghz n based on our testing) on a WLAN. We have a non-broadcast SSID defined to pilot this and it seems to work based on the little testing we have done so far. (I use an Intel MacBook Pro with 10.4 and it is 802.11n capable.) Barron Hulver Director of Networking, Operations, and Systems Center for Information Technology Oberlin College Oberlin, OH 44074 William Green wrote: We continue to experience problems with Mac OSX devices preferring 2.4GHz (g) networks instead of 5GHz (a/n). We want devices at 5GHz whenever possible. From the little we can tell the pllst (/Library/Preferences/SystemConfiguration/com.apple.airport.preferences.plist) appears to be remembering channels seen across our campus-wide SSID, and then chooses 2.4GHz for whatever reasons. If you delete the slower channels in the plist and don't change APs, it stays on the 5GHz channel. Unfortunately our wireless infrastructure is mixed (lots of g only) so a user will quickly get a 2.4GHz channel in their plist which sticks them in 2.4GHz again. Does anyone have additional information about this problem? Work-arounds (on a campus scale)? Dates for fixes? ** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
