What are people using for Channel width settings on the Cisco WLC? 20, 40 or 80?
-Matt From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Dan Brisson Sent: Thursday, October 02, 2014 3:14 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] windows client intermittent drops of connection wlc 7.6 I had this exact scenario happen today on my Macbook air. I left my office to go to the Dorm to troubleshoot. The student wasn't in their room so I went into the common area and turned on my Air. I was associated and authenticated but couldn't get anywhere. I looked at my routing table (netstat -nr) and sure enough, no default gateway. I disabled and reenabled WiFi and it was fine. That's the first time I've seen that behavior. -dan Dan Brisson Network Engineer University of Vermont (Ph) 802.656.8111 dbris...@uvm.edu<mailto:dbris...@uvm.edu> On 10/2/2014 1:50 PM, Ashfield, Matt (NBCC) wrote: A real oddity we see with this is the fact the ARP table on the client has no entry for the gateway when its losing its connectivity. Is anyone else seeing that? Generally this is when the laptop is coming back from some form of sleep. We still see it authenticated and associated. We do have DHCP Required option enabled. From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of McClintic, Thomas Sent: Thursday, October 02, 2014 10:28 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> Subject: Re: [WIRELESS-LAN] windows client intermittent drops of connection wlc 7.6 Dan, Do you have DHCP Addr. Assignment Required on? I’m seeing a similar issue since going to 7.6 and also see it on 8.0. I can’t access your case, so if you could update me offline that would be wonderful. Thanks From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Dan Brisson Sent: Thursday, October 02, 2014 7:38 AM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> Subject: Re: [WIRELESS-LAN] windows client intermittent drops of connection wlc 7.6 Very interesting b/c we are getting complaints from students with both Mac and Windows clients. I disabled band select & load balancing and that seems to have helped, but I still have students who complain that they get dropped randomly. We're on 7.6.120. I've pressed multiple TAC engineers about going to 7.6.130, but none of them will commit to that as being the fix. We also have only WPA2-AES enabled for our main ssid. Our TAC case is 63665837 for reference. One thing that I have noticed is that when the students complain of dropping, it seems be due to the fact that they have roamed from one AP to another and the roam is taking so long that some clients end up needing to go through the DHCP process again. The odd thing is that when I look at the RSSI for the client, it's in the high -60s/low -70s, so I don't know why the are roaming. -dan Dan Brisson Network Engineer University of Vermont (Ph) 802.656.8111 dbris...@uvm.edu<mailto:dbris...@uvm.edu> On 10/1/2014 7:18 PM, Britton Anderson wrote: We've had the same issues regardless of Mac or Windows clients. We tracked it down with TAC on our controllers (running either 7.6.122.9 or 7.6.130.0) as an issue with both WPA&WPA2 enabled along side client band select/load balancing. Band select and load balancing are obviously big ones, but disabling WPA and leaving only WPA2-AES layer 2 security has remediated the problem for us. -Britton Britton Anderson<mailto:blanders...@alaska.edu> | Senior Network Communications Specialist | University of Alaska<https://urldefense.proofpoint.com/v1/url?u=http://www.alaska.edu/oit&k=yYSsEqip9%2FcIjLHUhVwIqA%3D%3D%0A&r=eHsexY0U6WY24UhDK4eLQbvXOPzMySRoCq87DX3WV5M%3D%0A&m=catvvxD%2FLWUPrt7teEftVW%2BVyZ7q4Mdxyz136gey7Lk%3D%0A&s=49b7a6706beeaa53ae26409a343bfd57f3838be4a0965c03816c0032ea4247e2> | 907.450.8250 On Wed, Oct 1, 2014 at 3:10 PM, Ashfield, Matt (NBCC) <matt.ashfi...@nbcc.ca<mailto:matt.ashfi...@nbcc.ca>> wrote: Hello We are seeing some intermittent issues with some of our student computers (a lot of HPs, but some others) whereby they will be working away, well connected, and suddenly get the yellow exclamation mark in on their wifi connection in the taskbar and lose connectivity. Sometimes they can get back on, sometimes they have to reboot. We have tried updating drivers and that has not fixed the problem, although in one case we forced the client to 2.4ghz range thru settings in the adapter and that seemed to fix the probem in some cases. The issue is very odd. It appears almost to be location or AP specific although reports are hard to nail down. Anecdotal reports suggest more difficulty with non-3702i APs (we have some 3500's and 3600's APs as well) The network is an EAP-TLS network with client side certs. As with most student wifi issues, it’s nearly impossible to get real debugging results, but one thing we have noticed is when the student is having issues, we’ve seen where the controller is showing them as associated and authenticated, but the client machine seems to show that it has an IP gateway and mask but for some reason there’s no gateway entry in the ARP table of the client. Release/Renew does nothing. Ping from the gateway does nothing. Very odd issue. DHCP is provisioned by a central Microsoft DHCP server (ie, not the cisco device) and we’re using 1 hour lease times. Some students we've seen it happen to are a result of their laptop going asleep. I personally tend to lean towards this being a client driver issue. Problem is, it's nearly impossible to have every student with up to date drivers in this BYOD type world we operate in. At the end of the day, we have students who need wifi access and cannot get on and blaming IT. This is a small subset of users, but an issue nonetheless. I have heard rumblings of various wlc options/settings that may be causing issues and we do have the following list below. Turning one off at a time is an option I suppose, but hoping that someone may have some better recommendations here. - Client Band Select enabled - Client Load Balancing enabled - User Idle Timeout set to 5400 Seconds (this is under Controller/General) - CCKM enabled - Session Timeout 36000 (this is under WLAN/Advanced) - DHCP Address Assignment Required is checked Any advice/info is appreciated. Thanks Matt ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/<https://urldefense.proofpoint.com/v1/url?u=http://www.educause.edu/groups/&k=yYSsEqip9%2FcIjLHUhVwIqA%3D%3D%0A&r=eHsexY0U6WY24UhDK4eLQbvXOPzMySRoCq87DX3WV5M%3D%0A&m=catvvxD%2FLWUPrt7teEftVW%2BVyZ7q4Mdxyz136gey7Lk%3D%0A&s=33f3118437340917aff79b8decc9c6b4f48a81e4512a362d5439c35fa30580ee>. ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/<https://urldefense.proofpoint.com/v1/url?u=http://www.educause.edu/groups/&k=yYSsEqip9%2FcIjLHUhVwIqA%3D%3D%0A&r=eHsexY0U6WY24UhDK4eLQbvXOPzMySRoCq87DX3WV5M%3D%0A&m=catvvxD%2FLWUPrt7teEftVW%2BVyZ7q4Mdxyz136gey7Lk%3D%0A&s=33f3118437340917aff79b8decc9c6b4f48a81e4512a362d5439c35fa30580ee>. ********** 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/.
