I have a couple issues that has been intermittently recurring since our students returned this fall. This issue only seems to happen with MacBooks.
In both scenarios the MacBook shows up as connected to an AP (on the controllers/MM and the MacBook itself) yet cannot pass any traffic, even arp or dhcp. I have packet captures from the client side show that it is sending ARPs and DHCP discovers but getting no responses.
Scenario 1: The user opens the MacBook after it has been closed for an extended period and moved to a new location. It takes 30 seconds to 3 minutes for the wireless to start passing traffic. Logs show it connects to an AP immediately then reconnects, usually to the same AP, after some period of time (seconds to minutes). At that point it starts passing traffic as normal. If the user cycles the wireless adapter it starts passing traffic immediately.
Scenario 2: The user has been stationary and usually active (but not always) on their MacBook for some period of time (40 minutes in the last reported case). The suddenly lose their internet connection, the Wifi symbol gets an exclamation point in it and the MacBook says it is searching for Wifi. They are usually close to the AP they are connected to with good signal strength. This scenario will continue until the user moves to a new location or cycles their wifi adapter. Packet capture from the client shows unanswered ARPs and DHCP discovers. Packet capture from the controller for the clients MAC shows no traffic at all to or from the client.
Aruba TAC has been engaged but has no idea what is happening. As I can't reproduce it for them they don't seem to be interested in troubleshooting further. We have tried different power level settings, disabling Airgroup and setting “Force 5Ghz” with no change in the issues.