topic Laptops losing internet capabilities in wireless controller. in Wireless

Laptops losing internet capabilities in wireless controller.

asmolens — Wed, 27 Oct 2021 19:18:48 GMT

Has anyone seen an issue with the Cisco 5508 model wireless controller where it is randomly dropping clients IP addresses ( specifically Lenovo users and noone else )? They connect to the SSID surf the web then eventually get lose wireless, They are still connected to the SSID but lose internet and ipv4 address.

Re: Laptops losing internet capabilities in wireless controller.

Arshad Safrulla — Wed, 27 Oct 2021 19:21:31 GMT

This symptom may be due to drivers. Upgrade the wireless NIC's to the latest drivers. Once done if the issue still persist, please post a debug client output from WLC for an impacted client.

Re: Laptops losing internet capabilities in wireless controller.

David Ritter — Wed, 27 Oct 2021 21:11:04 GMT

very short DHCP lease time?

Re: Laptops losing internet capabilities in wireless controller.

Leo Laohoo — Thu, 28 Oct 2021 02:21:57 GMT

This issue is only affecting Lenovo laptops? Are all the laptops of the same model? What is the exact model number of the wireless NIC? What is the exact version of the firmware of the wireless NIC?

Re: Laptops losing internet capabilities in wireless controller.

JPavonM — Thu, 28 Oct 2021 05:28:11 GMT

Which code release are you running? Does your APs work in Fleconnect mode? Which AP model is affected (COS-AP)?

I've experienced similar issues in c9800 with COS-APs and at the end I was hitting CSCvw30043 that is fixed in 17.3.3.

My symptoms were that all locally forwarded clients (laptops) connected to some APs were not receiving DHCP Offer so losing the IP address, but centrally forwarded clients were working fine (BYOD and Guest devices). This happened every 20 days more or less, aand always to the same APs. Bouncing the radio interface did the trick if not updating the code.

As AP firmware is shared between c9800 and AireOS WLCs, check if this is something that maybe fixed with the latest code.

Moreover, I've experienced similar issues with IOS-APs but due to the fact that these APs are not receiving new code updates nor TAC is investigating the issues due to the previous fact, there is nothing we can do except swap them by COS-APs.

HTH
-Jesus
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Re: Laptops losing internet capabilities in wireless controller.

Rich R — Tue, 02 Nov 2021 15:11:55 GMT

A few years back we had a similar problem after IT team pushed a Windows firewall policy update which prevented the PC from doing a DHCP renew so that's another thing to consider.