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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.
142 REPLIES 142

FES
New Contributor III
we dont have radar, but jave autotx y active mode configured....now we are testing with all disabled... monitor mode, no radar, 3-channel plan,
thanks

May not be related to your environment but we are finding that having Radar enabled can cause issues. We are experimenting with having it monitor only rather than enacting any countermeasures.

FES
New Contributor III
Maybe you can try to upgrade to 9.21.10.x and tell us... we are testing on 8.x if we can isolate the problem. First configuring all to basic options, no autotx, no auto channel, decreasing transmit power to do cells smallers, and nothing about protocolos, like 802.11k, r, h.... Frist trying to solve the disconnections and then we will solve roaming problems.
Does anybody continue having problems with last 10.x firmware??

I have read complete post, can anyone give a final resolution on clients disconnecting frequently on identifi wireless.

I am having the issue from 1 year , I have done several up gradations currently running C5210 controllers and 3805i AP's on software version 9.21.8.x.

In the recommended settings for my environment is to set the DTIM to 2 we have not had problems for a few months. 3825i on V2110 09.21.09.0004. I believe Our issues were fixed in the 09.21.07.

Honestly I believe most of these issues are RF settings based. Co-Channel interference or due to ATPC being enabled and Dynamic Channel Selection set to active mode. Enabling both for 60min when we add a new ap in a building other than that we disable it. You really have to pay attention to what values you set for DCS.
https://gtacknowledge.extremenetworks.com/articles/Q_A/What-are-the-best-radio-settings-for-my-envir...

Possible ATPC and DCS Fighting to keep the low nose floor threshold set in the advanced radio options. "DCS Noise Threshold [dBm]" When the AP changes output levels and or changes clients channel without the client adapting. Just a theory but I'm not veteran wireless expert.
GTM-P2G8KFN