11-06-2019 11:28 PM - edited 07-05-2021 11:15 AM
Hello,
we have WLC 3504 ios 8.8.120.0 + set of AIR-CAP3702I-E-K9
From time to time, clients experience problems connecting to a wireless network. Two identical twin laptops can be a meter away from the access point and on one there will be everything OK and on the other there are communication problems.
Laptops equipped with Intel AC 9560.
Event log for problem laptop attached.
11-12-2019 01:04 PM
11-13-2019 02:39 AM
mobile devices connect only to the guest network and are not the main business devices. Since I can’t repeat the problem even on a usually PC, I can’t say that there are no problems on the mobile.
A mobile device can use the GSM connection automatically if there is no connection via a wi-fi network without notifying the user.
11-13-2019 03:53 AM
11-13-2019 01:32 PM
11-07-2019 01:00 AM
- Following your debug log(s) , you may want to feed them into the Wireless Debug Analyzer available from the link below. You may also want to have a look at the Wireless Config Analyzer - WCAE and or the Wireless Lan Config Analyzer (WLCCA). Have your configuration analyzed, check advisories and or correct errors :
M.
11-13-2019 01:55 PM
This is very similar to an issue I have in our foreign offices. We have 2504's and Cap2602I,s but updating to 3504's to hopefully fix the issue.
We seem to see the same issue with Intel wireless. A device seems to be connected, but can't go anywhere and can last up to 2 hours. It's extremely random and hard to recreate, but I was able to get it to happen a couple times to a test device.
From packet captures and debugs, I can see it being a ping/DHCP issue. It seems that Intel devices ping the default gateway every few seconds. I think this is to detect a vlan change cause if it misses 5 pings, it kicks off DHCP. Now, what I saw is the WLC sent the request, and got the response from the DHCP server, but a packet capture on the device showed no response from the server and if you do ipconfig, you should see the computer with a default 169 address. I worked with TAC on this and they blamed it on Intel and closed the case.
A month or so down the road, I got it to happen again, and this time had a sniffer to see the wireless traffic. I could see the DHCP response on the WLC, but the sniffer was not seeing the packet being broadcast, so it proved it's a Cisco issue.
It also seems to be with 802.1x or higher auth as a hotspot with a psk never had the issue.
My downside is out support lapsed as we are upgrading to 3504's, so I can't open another ticket until I see the same issue on the new controllers. We had the issue on 8.5 code, and I was hoping the 8.8 code had fixed it. The weird issue is I have never seen it in our main facilities, but we have 2802's and 4800's in those, so may be with the older APs.
11-13-2019 02:21 PM
@Dustin Anderson what ios you run 3504 ?
11-16-2019 10:38 AM
2504 was on 8.3, and 8.5. I'm trying 8.8.125 on the 3504. I haven't heard if the problem went away or not.
11-16-2019 12:24 PM
11-13-2019 04:04 PM
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