Re: [WIRELESS-LAN] windows client intermittent drops of connection wlc 7.6

[Dan Brisson]

For those interested, yesterday I worked with a student who had been 
complaining of dropping and "taking 20 minutes to get a Skype session 
going."  Turns out her Macbook Pro was on 10.8.5.  I recommended she 
upgrade to Mavericks (10.9.5) and let me know if it makes a difference.  
I received this email last night from her:


"I have had much better connection, thank you again! Skype and 
BlackBoard are working well!"


So needless to say I will be encouraging my Macbook students to make 
sure they are up-to-date with upgrades.


-dan


Dan Brisson
Network Engineer
University of Vermont
(Ph) 802.656.8111
dbris...@uvm.edu

On 10/2/2014 8:37 AM, Dan Brisson wrote:
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  | 	Senior Network 
Communications Specialist**| 	University of Alaska 
 | 	 907.450.8250




On Wed, Oct 1, 2014 at 3:10 PM, Ashfield, Matt (NBCC) 
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

RE: [WIRELESS-LAN] windows client intermittent drops of connection wlc 7.6

[trent . hurt]

Here is the last 2 things from that thread that seemed to help this issue for 
him

Dear all. After intensive and thorough investigations done by Cisco and 
ourselves, we found out that it is the client that stops sending data after the 
laptop has been in power save mode ("has gone to sleep"). The problem only 
occurs when a client is associated to an Access Point that is on one of the 
Extended UNII-2 channels 100,104 or 108. After the client comes back from power 
save, it gradualy starts to stop sending data to the AP until it completely 
stops. This is why the yellow exclamation mark (eventually) appears over the 
WiFi icon in the systemtray.

We tested with the latest DELL drivers and they all kept gining the problem. 
When we tested with the latest Intel driver, the problem did not occurr anymore.

The solution is to install the latest Intel driver on all laptops.

I would like to thank everyone in this thread for his / her contribution to the 
solution of this problem. All of you were very helpful !



Then he did this…

It seems that installing the latest Intel driver did not fix the issue !

In the Windows device manager, what is required is to uncheck this box on the 
NIC:
"allow the computer to shut down this device to save power"

Once this box is unchecked, the problem stops occurring.
From: The EDUCAUSE Wireless Issues Constituent Group Listserv 
[mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Trent Hurt
Sent: Thursday, October 02, 2014 3:16 PM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: Re: [WIRELESS-LAN] windows client intermittent drops of connection wlc 
7.6

20MHz for both 2.4 and 5.  Give me more channels.  Also I remember reading this 
a few months ago.  Not 7.6 but some good info.  Seems it ended up being sleep 
settings with the nic

http://www.linkedin.com/groups/Default-Gateway-not-available-on-101641.S.5853455742639575043?trk=groups_items_see_more-0-b-ttl

From: The EDUCAUSE Wireless Issues Constituent Group Listserv 
[mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of James Helzerman
Sent: Thursday, October 02, 2014 3:06 PM
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

20MHz on the 2.4GHz
40MHz on the 5GHz


On Thu, Oct 2, 2014 at 2:50 PM, Danny Eaton 
mailto:dannyea...@rice.edu>> wrote:
We’re at 20 Mhz for the 2.4 band, and 40 Mhz for the 5.2 band.  (regardless of 
the AP type, 1142, 1252, 3502 or 3702).



From: The EDUCAUSE Wireless Issues Constituent Group Listserv 
[mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>]
 On Behalf Of Ashfield, Matt (NBCC)
Sent: Thursday, October 02, 2014 1:40 PM
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

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<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<mailto: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.

Tha

RE: [WIRELESS-LAN] windows client intermittent drops of connection wlc 7.6

[trent . hurt]

20MHz for both 2.4 and 5.  Give me more channels.  Also I remember reading this 
a few months ago.  Not 7.6 but some good info.  Seems it ended up being sleep 
settings with the nic

http://www.linkedin.com/groups/Default-Gateway-not-available-on-101641.S.5853455742639575043?trk=groups_items_see_more-0-b-ttl

From: The EDUCAUSE Wireless Issues Constituent Group Listserv 
[mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of James Helzerman
Sent: Thursday, October 02, 2014 3:06 PM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: Re: [WIRELESS-LAN] windows client intermittent drops of connection wlc 
7.6

20MHz on the 2.4GHz
40MHz on the 5GHz


On Thu, Oct 2, 2014 at 2:50 PM, Danny Eaton 
mailto:dannyea...@rice.edu>> wrote:
We’re at 20 Mhz for the 2.4 band, and 40 Mhz for the 5.2 band.  (regardless of 
the AP type, 1142, 1252, 3502 or 3702).



From: The EDUCAUSE Wireless Issues Constituent Group Listserv 
[mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>]
 On Behalf Of Ashfield, Matt (NBCC)
Sent: Thursday, October 02, 2014 1:40 PM
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

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<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<mailto: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 o

Re: [WIRELESS-LAN] windows client intermittent drops of connection wlc 7.6

[James Helzerman]

20MHz on the 2.4GHz
40MHz on the 5GHz


On Thu, Oct 2, 2014 at 2:50 PM, Danny Eaton  wrote:

> We’re at 20 Mhz for the 2.4 band, and 40 Mhz for the 5.2 band.
> (regardless of the AP type, 1142, 1252, 3502 or 3702).
>
>
>
>
>
>
>
> *From:* The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:
> WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] *On Behalf Of *Ashfield, Matt (NBCC)
> *Sent:* Thursday, October 02, 2014 1:40 PM
> *To:* WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
> *Subject:* Re: [WIRELESS-LAN] windows client intermittent drops of
> connection wlc 7.6
>
>
>
> 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
> ] *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
> ] *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  |
>
>  Senior Network Communications Specialist |
>
>  University of Alaska
> <https://urldefen

RE: [WIRELESS-LAN] windows client intermittent drops of connection wlc 7.6

[Danny Eaton]

We’re at 20 Mhz for the 2.4 band, and 40 Mhz for the 5.2 band.  (regardless of 
the AP type, 1142, 1252, 3502 or 3702).  

 

 

 

From: The EDUCAUSE Wireless Issues Constituent Group Listserv 
[mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Ashfield, Matt (NBCC)
Sent: Thursday, October 02, 2014 1:40 PM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: Re: [WIRELESS-LAN] windows client intermittent drops of connection wlc 
7.6

 

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] 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] 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 <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)  
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 f

Re: [WIRELESS-LAN] windows client intermittent drops of connection wlc 7.6

[Britton Anderson]

40 on 5GHz (even with 3702's...for now), and 20 on 2.4 (which I hope
everyone does).



Britton Anderson  | 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
> ] *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
> ] *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  |
>
>  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&

RE: [WIRELESS-LAN] windows client intermittent drops of connection wlc 7.6

[Ashfield, Matt (NBCC)]

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) 
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

Re: [WIRELESS-LAN] windows client intermittent drops of connection wlc 7.6

[Dan Brisson]

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] *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] *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)
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

Re: [WIRELESS-LAN] windows client intermittent drops of connection wlc 7.6

[Dennis Xu]

Matt, 

We are on 7.4.121.0 and I don't see this issue. I have similar setup with you: 

- Client Band Select enabled 
- Client Load Balancing enabled 
- User Idle Timeout set to 300 Seconds (this is under Controller/General) 
- CCKM Disabled 
- Session Timeout 36000 (this is under WLAN/Advanced) 
- DHCP Address Assignment Required is checked 

The only big difference is the CCKM . Can you try to disable it? 


Dennis Xu 


- Original Message -

From: "Matt Ashfield (NBCC)"  
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU 
Sent: Thursday, October 2, 2014 1:50:51 PM 
Subject: Re: [WIRELESS-LAN] windows client intermittent drops of connection wlc 
7.6 



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 
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 
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 |  
Senior Network Communications Specialist |  
University of Alaska |  
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

Re: [WIRELESS-LAN] windows client intermittent drops of connection wlc 7.6

[Jeffrey Sessler]

If you have CCKM enabled, that's going to cause problems. It's recommend
only on WLANs where you have very tight control of the clients, and a
college SSID with students connected is not one of them. There are a lot
of client drivers that can't deal with it, and they will roll over on a
roam, be it to another AP or from 2.4 to 5. Just say no to that feature.

 
CCKM is however really helpful with VoIP roaming, so we use it only in
a WLAN dedicated to our Cisco VoIP phones - huge difference there, and
the phones all support CCKM.
 
Band select and load balancing - trouble makers (I see it both on Cisco
and Aruba's version). There are enough client driver oddities, and
you'll be forever chasing your tail. We don't have them enabled, and
distribution between 2.4 and 5 looks great. We have a dense deployment,
so load balancing has so far been unnecessary i.e. less than 10 devices
per AP, split between radios. 
 
Jeff

>>> On Wednesday, October 01, 2014 at 4:10 PM, in message
, "Ashfield,
Matt (NBCC)"  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/.

**
Participation and subscription information for this EDUCAUSE Constituent Group 
discussion list can be found at http://www.educause.edu/groups/.

RE: [WIRELESS-LAN] windows client intermittent drops of connection wlc 7.6

[Ashfield, Matt (NBCC)]

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
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) 
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 acce

RE: [WIRELESS-LAN] windows client intermittent drops of connection wlc 7.6

[McClintic, Thomas]

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
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) 
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 subscr

Re: [WIRELESS-LAN] windows client intermittent drops of connection wlc 7.6

[Dan Brisson]

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  | 	Senior Network 
Communications Specialist**| 	University of Alaska 
 | 	 907.450.8250




On Wed, Oct 1, 2014 at 3:10 PM, Ashfield, Matt (NBCC) 
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/.


** 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] windows client intermittent drops of connection wlc 7.6

[Britton Anderson]

The service request number for my case is 631962365.

On Wednesday, October 1, 2014, Watters, John  wrote:

> Can we get the TAC case number so we can read the details of the case (I'm
> pretty sure we have the same problem; my Cisco tech guy can get access to
> the case so I can look at it).
>
> Thanks.
>
> Sent from my iPhone
>
> On Oct 1, 2014, at 6:18 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 |
> Senior Network Communications Specialist |  University of Alaska<
> http://www.alaska.edu/oit> |   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/.
>
> ** 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/.
>


-- 


Britton Anderson  | Senior Network Communications
Specialist | University of Alaska  | 907.450.8250

**
Participation and subscription information for this EDUCAUSE Constituent Group 
discussion list can be found at http://www.educause.edu/groups/.

Re: [WIRELESS-LAN] windows client intermittent drops of connection wlc 7.6

[Watters, John]

Can we get the TAC case number so we can read the details of the case (I'm 
pretty sure we have the same problem; my Cisco tech guy can get access to the 
case so I can look at it).

Thanks.

Sent from my iPhone

On Oct 1, 2014, at 6:18 PM, "Britton Anderson" 
mailto:blanders...@alaska.edu>> 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 |Senior Network 
Communications Specialist |  University of 
Alaska |   907.450.8250


On Wed, Oct 1, 2014 at 3:10 PM, Ashfield, Matt (NBCC) 
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/.

** 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] windows client intermittent drops of connection wlc 7.6

[Britton Anderson]

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  | Senior Network Communications
Specialist | University of Alaska  | 907.450.8250

On Wed, Oct 1, 2014 at 3:10 PM, Ashfield, Matt (NBCC)  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/.
>

**
Participation and subscription information for this EDUCAUSE Constituent Group 
discussion list can be found at http://www.educause.edu/groups/.