40 on 5GHz (even with 3702's...for now), and 20 on 2.4 (which I hope everyone does).
Britton Anderson <blanders...@alaska.edu> | Senior Network Communications Specialist | University of Alaska <http://www.alaska.edu/oit> | 907.450.8250 On Thu, Oct 2, 2014 at 10:40 AM, Ashfield, Matt (NBCC) < matt.ashfi...@nbcc.ca> wrote: > 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 > > 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 > <WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>] *On Behalf Of *McClintic, Thomas > *Sent:* Thursday, October 02, 2014 10:28 AM > *To:* 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 > <WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>] *On Behalf Of *Dan Brisson > *Sent:* Thursday, October 02, 2014 7:38 AM > *To:* 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 > > 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 <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> 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/. > ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
