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Wireless clients sporadically getting Limited Connectivity, APs dropping packets

Wireless clients sporadically getting Limited Connectivity, APs dropping packets

John_Rowler
New Contributor
We have a pair of V2110 wireless controllers and around 400 3825i access points. Controller firmware is 09.21.06.0002. AP firmware is 9.21.27.1387X.

About 4 months ago we noticed a problem where the APs would just drop traffic. A packet capture will show a ping coming into the radio from the client, going out the Eth interface on the AP, the reply coming back into the Eth interface, and never going out of the radio.

A particularly strange detail is that this only happens with certain source/destination traffic. For instance a client cant ping the gateway of 10.1.20.1/24. but cannot pint the server at 10.1.20.2. Since we can see the ping making it to the server and the ping reply making it back to the AP, we know it's not a firewall/ACL/routing issue on any other part of the network. The traffic disappears at the AP. Clients cannot communicate with anything on the Internet or any of our servers (DNS, DHCP, etc.) during this time. They can ping gateways in any subnet but that's it; everything else is failed.

More details:

-We've gone through several firmware updates with GTAC. Nothing has helped.
-The issue can affect any client on any AP in any location at any time.
-The issue is intermittent; it may happen every few minutes or once per month to a particular client in a particular area. Once failed it may last for seconds or days.
-While it's affecting one client, other clients on the AP may be working fine or may also fail.
-It can happen on either 2.4 or 5.7GHz.
-It can affect any type of client (phone, laptop, tablet) and any OS.
-Restarting the client or AP will sometimes fix the issue, sometimes not.
-It happens with our without using NAC, or any other type of authentication. It happens on completely open networks as well.
-It happens on both bridged at AP and bridged at controller topologies.
-It's not limited to a particular subnet or VLAN.
-It happens with or without Flexible Client Access enabled.
-It happens on either controller.
-GTAC hasn't made much progress on the issue in 4 months.
157 REPLIES 157

John_Rowler
New Contributor
Correct, we were sent an early release by GTAC.

This issue happens on every VNS (we've created 4 or 5 new ones for testing at this point).

I'm not sure which version of code our controllers started with. Might there be a log of that somewhere in the software?

Bill_Handler
Contributor II
9.21.06? You must have an early release. The newest I can see is 9.21.05.

Were your controller upgraded from V8 code?

We ran into an issue at a customer site where clients would connect, but would not get a DHCP address. It seemed to be at random times/locations. If you walked around one of the sites, you would suddenly get an IP and be online and working.

All went away once we recreated the VNS. We figured that somehow, over time/updates, the VNS/WLAN got corrupted. Recreating it with the same filters/roles/COS settings resolved our issue.

We have not had the issue return since.

Thanks,

Bill

Drew_C
Valued Contributor III
9.21.06.006-1 was made available for download on the Extranet moments ago: https://extranet.extremenetworks.com/downloads/Pages/WirelessControllers.aspx
GTM-P2G8KFN