Re: [WIRELESS-LAN] Turning off 802.11B and Android oddities

[Sullivan, Ryan]

We ran into the Kindle Fire issue after disabling 802.11b rates as well. 
Marking 6Mbps as Mandatory and leaving the other 802.11g rates as supported 
allowed the device to connect. We are using Cisco WiSM2s running 7.2.111.3 code.

Cheers,
Ryan Sullivan
Datacommunications
ACT, UCSD
rasulli...@ucsd.edu
858-822-5602

On Nov 27, 2012, at 8:09 AM, Dennis Xu  wrote:

> 12M: Mandatory
> 1,2,5.5,11M: Disabled
> All other data rates: Supported
> 
> ---
> Dennis Xu
> Network Analyst, Computing and Communication Services
> University of Guelph
> 5198244120 x 56217
> 
> - Original Message -
> From: "Eric T. Barnett" 
> To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
> Sent: Tuesday, November 27, 2012 11:05:17 AM
> Subject: Re: [WIRELESS-LAN] Turning off 802.11B and Android oddities
> 
> Interesting. I've tried with the 6 & 9 on as well, with the B rates off. 
> Still no luck. What mandatory rates are you folks using?
> 
> Thanks for the quick response, this is a real head scratcher.
> 
> --Eric
> 
> -Original Message-
> From: The EDUCAUSE Wireless Issues Constituent Group Listserv 
> [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Dennis Xu
> Sent: Tuesday, November 27, 2012 10:02 AM
> To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
> Subject: Re: [WIRELESS-LAN] Turning off 802.11B and Android oddities
> 
> We have disabled B for several years. But we did not disable 6 & 9 for G. We 
> haven't seen any issues. Kindle Fire definitely works here. 
> 
> I think the issue is related to the disable of 6 & 9. 
> 
> ---
> Dennis Xu
> Network Analyst, Computing and Communication Services University of Guelph
> 5198244120 x 56217
> 
> - Original Message -
> From: "John Watters" 
> To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
> Sent: Tuesday, November 27, 2012 10:59:04 AM
> Subject: Re: [WIRELESS-LAN] Turning off 802.11B and Android oddities
> 
> 
> 
> 
> The University of Alabama has had the B rates disabled for several years now 
> (at least 3) and have had only one complaint. Our athletic ticketing folks 
> were using B-only handheld ticket scanners for event admissions. I turned B 
> back on for 3 months for just their APs until they could replace their units. 
> No other problems have turned up. 
> 
> 
> 
> 
> 
> -jcw 
> 
> -
> John Watters UA: OIT 205-348-3992 
> 
> 
> 
> 
> 
> 
> From: The EDUCAUSE Wireless Issues Constituent Group Listserv 
> [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Eric T. Barnett 
> Sent: Tuesday, November 27, 2012 9:33 AM 
> To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU 
> Subject: [WIRELESS-LAN] Turning off 802.11B and Android oddities 
> 
> 
> 
> I know that some devices can act strange when 802.11B is turned off (such as 
> the Wii), but I was surprised when a student brought his Kindle Fire in 
> yesterday. I disabled the 802.11B data rates last week (along with 6 & 9 on 
> G). Anyone else have problems with early Androids? 
> 
> 
> 
> Thanks, 
> 
> Eric Barnett 
> 
> 
> 
> 
>   
> 
> Description: Description: Description: 
> http://area51.astate.edu/e-footer/wolf.jpg 
> 
> Eric Barnett 
> 
> Senior Network Engineer/Wireless Administrator 
> 
> Information and Technology Services 
> 
> 
> 
> P.O. Box 1140 | State University, AR 72467 
> 
> Office: (870) 680-4243 | Fax: (870) 972-3011 
> 
> ebarn...@astate.edu | http://www.astate.edu 
> 
> http://wireless.astate.edu
> 
> Description: Description: Description: 
> http://area51.astate.edu/e-footer/USnews.png
> 
> 
> 
> ** Participation and subscription information for this EDUCAUSE 
> Constituent Group discussion list can be found at 
> http://www.educause.edu/groups/. 
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> 
> 
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Re: [WIRELESS-LAN] Cisco WiSM2 7.4 stability issues?

[Sullivan, Ryan]

We have two WiSM2s that were ordered with 7.4.100.0 and have run into 
CSCtr41909 “WiSM2 - New out of box, APs are stuck in downloading state”. It 
looks like the 7.4 MSE code (which broke both of our 3350s when upgrading) has 
been removed.

Going back to 7.2…

Ryan Sullivan
Datacommunications
ACT, UCSD
rasulli...@ucsd.edu
858-822-5602

On Apr 24, 2013, at 11:21 AM, LaMarr Baucom 
mailto:gbau...@murraystate.edu>> wrote:


Yes, they have given me three different engineering builds and they have all 
crashed. I've had to revert to 7.3 three times.

Sent from my phone.

LaMarr Baucom
Wireless Network Engineer
Murray State University
Phone: (270)809-2299

On Apr 24, 2013 1:03 PM, "Joe Roth" 
mailto:jr...@binghamton.edu>> wrote:
Has anyone else seen stability issues with 7.4? We had to downgrade from 7.4 to 
7.3 due to our 1142 APs crashing. We had the patched engineering release that 
was supposed to fix this, but apparently there were multiple 1142 issues. The 
bug that we were hitting has yet to be patched.

Our hopes in going to 7.4 was to use a single HA only controller in a "pool" 
with our production controllers. Apparently this feature was implemented in 
7.4. Has anyone been able to use this? We did not get to test it due to the 
downgrade.

Thanks.

--
Joe Roth
Networking Group
Binghamton University
Ph. 607-777-7528
Fax 607-777-4009
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Re: [WIRELESS-LAN] Horizontal AP mounting options

[Sullivan, Ryan]

We have also used articulating antennas but in those cases, the antennas
are more apt to be moved from their original position and cause an odd
coverage pattern. That problem seems a lot worse in the Residences and
common areas so admin areas may be better suited for that option.

Ryan Sullivan
Datacommunications, ACT, UCSD
rasulli...@ucsd.edu
858-822-5602




On 10/24/13 5:53 AM, "Hector J Rios"  wrote:

>You could get WAPs with external antennas, wall-mount them and then point
>the antennas north and south.
>
>-Hector Rios
>Louisiana State University
>
>-Original Message-
>From: The EDUCAUSE Wireless Issues Constituent Group Listserv
>[mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Vlade Ristevski
>Sent: Wednesday, October 23, 2013 9:32 AM
>To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
>Subject: [WIRELESS-LAN] Horizontal AP mounting options
>
>Hello All,
>
>I was doing a little research on Cisco's site about mounting options and
>came across this guide:
>http://www.cisco.com/en/US/docs/wireless/technology/apdeploy/Cisco_Aironet
>.html
>.
>
>We are deploying a bunch of 1602's and 2602's and they recommend mounting
>them horizontally. There are areas where they need to be wall mounted and
>none of the ceiling mounts or brackets are an option. They recommend the
>Oberon P/N 1029-00, . It looks a bit overpriced for what it is and ugly
>IMO.
>
>http://www.oberonwireless.com/hard-lid_wall-mounted-access-point-enclosure
>s.php
>
>http://www.provantage.com/oberon-1029-00~7OBER009.htm
>
>
>Does anyone know of any other options?
>
>Thanks,
>
>--
>Vlad Ristevski
>Network Manager
>Ramapo College
>
>**
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RE: [WIRELESS-LAN] Disabled 2.4 Radios not staying disabled

[Sullivan, Ryan]

We are running 7.4.100.0 and see the same thing. Quite frustrating.

Ryan Sullivan
Datacom, ACT, UCSD
858-822-5602

From: The EDUCAUSE Wireless Issues Constituent Group Listserv 
[WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] on behalf of Mike Albano 
[mike.alb...@unlv.edu]
Sent: Friday, April 25, 2014 5:49 PM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: [WIRELESS-LAN] Disabled 2.4 Radios not staying disabled

Anyone else seeing this?
Cisco Wism2's ver. 7.6.100.10 (though I believe it affects all 7.6)
When I disable radios "config 802.11b disable " the radios turn 
themselves back on after a "config ap reset" or power outage, changing AP 
Group's etc. Basically, when the AP reboots, the radio re-enables itself.

TAC case pending.

Mike Albano


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RE: [WIRELESS-LAN] PoE Issue, Cisco Switches- Let's Poll The Audience!

[Sullivan, Ryan]

We have a similar problem when using midspan injectors. Does disabling CDP and 
then re-enabling it fix things? I believe our midspan understands LLDP but not 
CDP and the power negotiation between AP and switchport through the midspan was 
the issue. 

Ryan Sullivan



From: The EDUCAUSE Wireless Issues Constituent Group Listserv 
[WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] on behalf of Hunter Fuller [hf0...@uah.edu]
Sent: Tuesday, August 11, 2015 8:54 AM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: Re: [WIRELESS-LAN] PoE Issue, Cisco Switches- Let's Poll The Audience!

I haven't seen something exactly like this before, but one time,
"clear int gig0/1" (or whatever) solved a power issue on a 3560G PoE
with an oddball camera. Your mileage may vary.

--
Hunter Fuller
Network Engineer
VBRH M-9B
+1 256 824 5331

Office of Information Technology
The University of Alabama in Huntsville
Systems and Infrastructure

I am part of the UAH Safe Zone LGBTQIA support network:
http://www.uah.edu/student-affairs/safe-zone


On Tue, Aug 11, 2015 at 10:47 AM, Lee H Badman  wrote:
> We’re also going through TAC on this, but I’d like to see if anyone else is
> seeing similar in their Cisco switching environment and might have
> perspective to share.
>
> We have an odd, seemingly spontaneous condition where  PoE stops working on
> a port or two, with only switch reboot bringing it back. Most recent switch:
> WS-C3560X-48 on 15.0(2)SE7.
>
> Problem/discovery flow:
>
>
> One AP out of several on switch goes down
> Access switch, “show power inline” shows problem AP port has lost it’s PoE
> detection signature and is only showing IEEE PD
> All other AP ports are fine
> For problem port, remove PoE (Power Inline Never) then restore PoE (Power
> Inline Auto)- Port now dead, will not come back -also do shut/no shut,makes
> no difference to condition
> No error disable on port. No obvious reason for switch being out.
> Show environment/post commands reveal no issues with switch power or power
> controller
> Only a reboot restores PoE to problem port
>
>
> Seeing the same sort of condition on PoE camera ports as well- seems very
> much to be a pure switch issue, nothing to do with AP version/model in this
> case.
>
> Does this ring familiar for anyone?
>
> Regards,
>
> Lee Badman
>
>
>
>
> ** Participation and subscription information for this EDUCAUSE
> Constituent Group discussion list can be found at
> http://www.educause.edu/groups/.

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RE: [WIRELESS-LAN] Desktop projection to classroom display

[Sullivan, Ryan]

At UCSD, we have a customer who recently asked about a Barco Clickshare set up. 
The default mode is that it does act as an AP but there is an advanced set up 
configuration that allows the AP function to be disabled when the base unit has 
a wired connection and the remote buttons can attach to a WPA2-E network. 

Section 4.12
http://www.barco.com/tde/%282331390682231610%29/R594/08/Barco_InstallationManual_R594_08__ClickShare-CSC-1-Installation-Guide.pdf

No actual experience with the product but it sounds promising.
Thanks,
Ryan Sullivan



From: The EDUCAUSE Wireless Issues Constituent Group Listserv 
[WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] on behalf of Thomas Carter 
[tcar...@austincollege.edu]
Sent: Wednesday, October 28, 2015 6:35 AM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: Re: [WIRELESS-LAN] Desktop projection to classroom display

We have a ClickShare - it works well, but was very pricy. It basically is an AP 
(luckily it can do 5GHz so interference wasn’t a problem) that talks to the 
dongles. The benefit is the simplicity for Windows and Mac users; we get no 
support calls on it. The down side is the cost (4 digits for the device and USB 
dongles).


Thomas Carter
Network & Operations Manager
Austin College



-Original Message-
From: The EDUCAUSE Wireless Issues Constituent Group Listserv 
[mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Julian Y Koh
Sent: Tuesday, October 27, 2015 8:27 PM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: Re: [WIRELESS-LAN] Desktop projection to classroom display

On Tue Oct 27 2015 07:49:31 CDT, "Ashfield, Matt (NBCC)" 
 wrote:
>
> We’d like to try and standardize on a technology so we can manage it (ha!). 
> I’m just wondering if anyone has solved this one yet?  We’ve looked briefly 
> at AirParrot but wondering if anyone else has had any luck in this area.

One of our groups just showed up with the Barco ClickShare.  I know it's been 
discussed here in the past a couple of times, but any idea how it compares with 
some of the other solutions mentioned here already?

Just at a first glance I'm not too wild about it since it basically looks like 
an AP that gets connected to a projector or display.


--
Julian Y. Koh
Associate Director, Telecommunications and Network Services Northwestern 
Information Technology

2001 Sheridan Road #G-166
Evanston, IL 60208
847-467-5780
NUIT Web Site:  PGP Public 
Key:






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RE: [WIRELESS-LAN] Who wifi vendors does everyone use?

[Sullivan, Ryan]

Same for UCSD - Cisco -- just under 6K APs right now.

Ryan Sullivan


From: The EDUCAUSE Wireless Issues Constituent Group Listserv 
[WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] on behalf of Watters, John 
[john.watt...@ua.edu]
Sent: Thursday, March 31, 2016 9:44 AM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: Re: [WIRELESS-LAN] Who wifi vendors does everyone use?

Cisco -- just under 6K APs right now.




-jcw
  [UA Logo]

John Watters   The University of Alabama
Office of Information Technology
205-348-3992

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Re: [WIRELESS-LAN] Wireless Lighting Controls - impact on Wi-Fi or Wi-Fi's impact?

[Sullivan, Ryan]

We have several 802.15.4 wireless door lock installations across campus and 
have not noticed interference with our campus WiFi. We were lucky enough to 
work with our customers and the vendor to document where the installations were 
specifically and I believe the vendor stated they were only using channels 
23-25. It is important to remember that 802.11 and 802.15.4 both have channel 
numbers but since the width is different, the channels do not match up. A 
decent doc from Metageek sums the issue up nicely if you want to copy and paste 
it.

https://support.metageek.com/hc/en-us/articles/203845040-ZigBee-and-WiFi-Coexistence

Hope this helps,

Ryan Sullivan
Datacommunications
ITS, UCSD




On Mar 23, 2017, at 9:16 AM, Brian Helman 
mailto:bhel...@salemstate.edu>> wrote:

I agree with Mike.  Whenever I’m presented with another “do xx over wifi 
because it’s more convenient” I usually let them know I cannot guarantee that 
my wifi .. which is a requirement for and by the students .. will not interfere 
with their installation.  If they are ok with that, then go ahead.  I’d also be 
concerned about using a consumer-based home automation technology in an 
enterprise environment.  Was X10 not available ;)?

My personal opinion remains .. if it isn’t going to move, it shouldn’t be 
wireless.

All of that being said, maybe this is your opportunity to get more funding to 
move WiFi to 5GHz and leave 2.4 for IoT junk?

-Brian

From: The EDUCAUSE Wireless Issues Constituent Group Listserv 
[mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU]On Behalf Of Mike Atkins
Sent: Thursday, March 23, 2017 11:35 AM
To: 
WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: Re: [WIRELESS-LAN] Wireless Lighting Controls - impact on Wi-Fi or 
Wi-Fi's impact?

I would be concerned about your campus WiFi overrunning the ZigBee operation.  
We have a similar situation with ZigBee probes used to monitor freezer 
temperatures.  Campus WiFi is not heavily used in the kitchen areas so no 
issues to note for either side.



Mike Atkins
Network Engineer
Office of Information Technology
University of Notre Dame

From: The EDUCAUSE Wireless Issues Constituent Group Listserv 
[mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU]On
 Behalf Of Williams, Jess
Sent: Thursday, March 23, 2017 10:07 AM
To: 
WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: [WIRELESS-LAN] Wireless Lighting Controls - impact on Wi-Fi or Wi-Fi's 
impact?

Our campus Facilities department is looking at a wireless lighting control 
system that uses a "Zigbee based" 2.4GHz wireless protocol.  An example use 
case for this system is a parking garage that has 86 lights which are connected 
using a mesh network, however I can see it spreading indoors at some point down 
the road.  At a minimum, I know this will raise the noise floor.  Does anyone 
have any experience with a similar situation/technology that can share how this 
impacts your campus Wi-Fi or how Wi-Fi has impacted the lighting control 
system, etc?

The product is AcuityControls XPoint Wireless lighting controls
http://www.acuitybrands.com/products/controls/xpoint-wireless#e8f40e39-86a8-4d2e-9072-e8b872bce11b


I'm told by the manufacturer that the default channel used is Zigbee Channel 
15, which is 2.425 MHz (5MHz total channel width).  The channel can be changed.

Vendor says:
"XPoint Wireless Mesh operate a low duty cycle, narrow band (5 MHz wide) 
communications at up to +18 dBm output power, whereas 2.4 GHz Wifi operates at 
a high duty cycle, wideband communications (typical 20 to 60 MHz wide) 
typically at up to +23 dBm (that’s log scale so that’s a 5 dB difference which 
is actually over 3x as powerful as our system). I’ve never once seen a 
confirmed case where our Zigbee based mesh network interfered with their Wifi." 
 They promise it won't interfere with Wi-Fi.

I'd be more comfortable with something that uses 900MHz instead of 2.4GHz.

Vendor documentation:
XPoint Wireless uses a low duty cycle, narrow‐band, Zigbee®‐based 2.4 GHz 
wireless protocol that is not
known to interfere with your 2.4 GHz WiFi or other systems. The low 
communication duty cycle,
combined with clear‐to‐send backoff capability from the IEEE802.15.4 radio, 
typically does not produce
measurable impact to WiFi performance and is usually difficult to observe in an 
RF spectrum analyzer.
Each XPoint Wireless Bridge and associated mesh network (typically up to 250 
wireless devices) can also
be programmed to use a specific Zigbee RF channel to avoid co‐channel 
interference with other installed 2.4 GHz equipment. Zigbee channels 11‐26, 
corresponding with 5 MHz‐wide frequency bands from
2.405 GHz to 2.480 GHz may be assigned to specific wireless mesh networks.

The wireless communication is secured and encrypted using AES 128‐bit 
encryption. The network
protocol includes “replay” protection, where each wireless message is unique

RE: [WIRELESS-LAN] 802.11n configuration on Cisco

[Sullivan, Ryan]

Is you security configured as either open or WPA using AES? Under the 
controller GUI WLANs>Edit page footnotes -
7 WMM and open or AES security should be enabled to support higher 11n rates

Hope this helps,

Ryan Sullivan
Datacommunications
ACT, UCSD
858-822-5602

-Original Message-
From: The EDUCAUSE Wireless Issues Constituent Group Listserv 
[mailto:wireless-...@listserv.educause.edu] On Behalf Of Johnson, Bruce T.
Sent: Friday, April 16, 2010 3:15 PM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: Re: [WIRELESS-LAN] 802.11n configuration on Cisco

Is the AP configured with 2 transmit antennas?  Try rebooting/ 
resetting the AP to factory default?  Toggling ClientLink?

Bruce T. Johnson | Network Engineer | Partners Healthcare |  
617.726.9662 bjohns...@partners.org

On Apr 13, 2010, at 11:33 AM, "Mike King"  wrote:

> Ok.   I had my controller tweaked to where I liked it, but I forgot  
> to hit the save configuration settings button, and the controller  
> got rebooted in my test lab.
>
> I've replicated my "tweaks",  (40 Mhz 802.11a channels, Client Link  
> enabled on both bands, disabled 1, 2, 5.5, 6Mbps on the 802.11b/g  
> band)
>
> But I only seem to be able to associate at 150Mbps and I'm about 15  
> feet away from the access point.  I had 300 Mpbs before the reboot.
>
> What am I missing?
>
> Mike
> ** Participation and subscription information for this  
> EDUCAUSE Constituent Group discussion list can be found at 
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RE: AppleTV/ Campus WLAN

[Sullivan, Ryan]

Per Apple Support, the ATV supports WEP, WPA & WPA2 - both PSK.

Ryan Sullivan
Univeristy of California, San Diego

From: The EDUCAUSE Wireless Issues Constituent Group Listserv 
[mailto:wireless-...@listserv.educause.edu] On Behalf Of Schomer, Michael J.
Sent: Thursday, October 07, 2010 11:52 AM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: Re: [WIRELESS-LAN] AppleTV/ Campus WLAN

I haven't seen any on our campus yet.  We would probably handle them similar to 
game consoles and other Internet connected devices without a web browser.  Not 
sure if it would work on the WLAN with 802.1x, it's iOS based and the 
iPhone/iPad work great.  Depending on how your WLAN is setup (i.e. multicast), 
remote control from an iPhone or iPad probably won't work well, or at all.

-Mike

From: The EDUCAUSE Wireless Issues Constituent Group Listserv 
[mailto:wireless-...@listserv.educause.edu] On Behalf Of Lee H Badman
Sent: Thursday, October 07, 2010 8:18 AM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: [WIRELESS-LAN] AppleTV/ Campus WLAN

Apple has dropped prices on their AppleTV, and we're wondering if it will end 
meaning anything in the grand scheme from the WLAN support perspective. The 
unit itself can get network connectivity via Ethernet or wireless (probably not 
Enterprise security, but I don't know that), and users can control it from 
their network-connected iPhone or iPad.

Has anyone found these devices to be of concern?

-Lee Badman




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RE: [WIRELESS-LAN] WCS Error

[Sullivan, Ryan]

Hi Chris,
We asked this same question a while back and have decided to turn 
countermeasures from 60 to zero on our controllers that serve our Resnet areas 
because that is where the majority of the alarms originated. 

Cisco will not officially recommend that you configure a WLAN this way but lets 
you know that you can ;-)
 
There should be no risk in terms of functionality... but, countermeasures are 
there to address architectural problems with TKIP/MIC, so "disabling" 
countermeasures leaves your network vulnerable but at very little risk IMO.

My understanding is that default countermeasures suspend all traffic, on all 
radios, on all wlans when an attack is heard.   

Hope this helps,
Ryan Sullivan
University of California, San Diego



-Original Message-
From: The EDUCAUSE Wireless Issues Constituent Group Listserv 
[mailto:wireless-...@listserv.educause.edu] On Behalf Of Jonn Martell
Sent: Friday, October 22, 2010 2:17 PM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: Re: [WIRELESS-LAN] WCS Error

Hi Chris,

MIC (message integrity check) was really a "patch" for TKIP to prevent
replay attacks.  I happened to be in the IEEE TGI working group when
this feature was heavily discussed.  Many felt that the
countermeasures were more harmful than beneficial. I still remember
the notion passing after the argument was made that "TKIP will be
short lived and this will be a non-issue". This is another reason to
move from TKIP (WPA) to AES (WPA2).

My understanding is that the countermeasures impact any new connection
for 60 seconds. So effectively one trigger creates a DOS for all new
users!

I would consider reducing or turning off the countermeasure.  On WLC
(4.1 or greater)

config wlan security tkip hold-down  .

Where X is the number of seconds to deny access to your WLAN on a MIC
trigger.  Use 0 to disable MIC.

Jonn Martell, Director of Technical Operations, FDU Vancouver

On Fri, Oct 22, 2010 at 1:26 PM, Chris Wandell  wrote:
> Hello All,
>
> We have been seeing a lot of MIC errors on WCS this semester, "The AP
> 'xx' received a WPA MIC error on protocol '0' from Station
> 'xx.xx.xx.xx.xx.xx'. Counter measures have been activated and traffic has
> been suspended for 60 seconds".
> What I have read is that this may be a problem with the mac addresses for
> the IPAD, as well as out of date device drivers for other wireless card
> vendors. I have also found you can turn the reporting of these errors off,
> but am a little wary of that.
> Has anyone run into this and what would be the downside to disabling this?
> The upside I would think would be that the ap wouldn't be suspending traffic
> for 60 seconds at a clip when this error occurs.
>
> Thanks for any input
>
> Chris Wandell
> Binghamton University
>
>
> ** Participation and subscription information for this EDUCAUSE
> Constituent Group discussion list can be found at
> http://www.educause.edu/groups/.

**
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RE: Unknown Interfering Device

[Sullivan, Ryan]

We have seen wireless headphones kill the entire 2.4GHz spectrum.

Specifically -

Device: 2.4 Ghz Wireless Headphones

Brand: Coby

Model: CV 890
Hope this helps,
Ryan Sullivan
Datacom, ACT
858-822-5602

From: The EDUCAUSE Wireless Issues Constituent Group Listserv 
[mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Barber, Matt
Sent: Tuesday, April 19, 2011 9:34 AM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: [WIRELESS-LAN] Unknown Interfering Device

Hi all,

I am currently troubleshooting an issue in one of our residence halls that 
appears to be related to some kind of non-802.11 wireless device. Cognio (now 
Cisco of course :) ) Spectrum Expert shows an unknown 2.4 GHz device, sometimes 
taking up to 90% of the duty cycle on seemingly random channels in 2.4 GHz. It 
has affected every channel between 1 and 13, and is always very strong and busy.

I have seen cordless phones, video cameras, and microwaves interfere in the 
past, but this doesn't quite look like those. Cognio doesn't match it to a 
signature either. Anybody seen anything like this, especially recently? This 
problem apparently started a few weeks ago, so I am wondering if someone 
brought something new and shiny back after spring break.

Thanks!

Matt Barber
Network and Systems Manager
Morrisville State College
315-684-6053

** 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/.