My gut feeling is that this is going to cause problems ...
But here are some thoughts:
- Group policies can use a schedule, and for night hours the policy could use a quarantine vlan (not sure if it will work if the client is connected when the schedule kicks in)
- An API script that changes the Group-Policy at the trigger times.
- Use a dedicated WLAN for these clients that is disabled at night
- If you use 802.1X, you could configure time constraints on the RADIUS server
- Just block everything for these users on the upstream firewall at night
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