We have been working with Cisco TAC to troubleshoot an issue where our MacOS clients will randomly lose connectivity to the default gateway (and thus internet etc.). The wireless will stay connected in the run state, but the Mac will send out repeated ARP requests for the default gateway during the outages. The outages last between 20 seconds to 5 minutes and is resolved once the client gets an ARP response from the gateway.
We have packet captures showing ARP requests going through the CAPWAP tunnel to the controller but NOT leaving the controller to the gateway during the outages. TAC has acknowledged the problem is on the controller, and I’m waiting to hear back from them.
I’m wondering if anyone else has seen similar issues?
We are a university and having students attending Zoom classes from their residence halls doesn't work very well when the "Wi-Fi keeps disconnecting".
More details:
- WLC is two 5508 in HA configuration
- WLC was running 8.5.161.0 and we upgraded to 8.5.161.7 to troubleshoot
- MacOS versions with the issue so far: Catalina 10.15.7 and 10.15.6
- 250 APs are running in local mode (the issue does not happen when testing in Flexconnect mode with local switching)
- Default gateway is a Palo Alto firewall
- The MacOS client sends an ARP broadcast to find the gateway every 20 minutes but the outage doesn’t happen every 20 minutes
- It seems like the issue appears during high utilization on the controller since I didn’t see any issues when testing over a campus break when many students were gone
- I’ve seen the issue on multiple SSID’s including a test SSID which only had my clients on it
- Client debug on the controller shows no issues
- This doesn’t seem to affect Windows machines
Thank you!
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