Hello, In a WPA2 Enterprise wireless environment, I'm trying to control the number of simultaneous connections a user can have. My setup includes Freeradius 3.0.21 from Debian Bullseye's repo. I've seen this Simultaneous-Use setting in documentation. When testing it, I thought I first needed to have radutmp working OK. Unfortunately, my WiFi AP (Unifi AP) do not send NAS-Port AVP in Account-Requests. This seems to prevent radutmp (and checkrad) to work OK. At the same time, I can see meaningful and accurate data in my /var/log/freeradius/racacct directory. So my my question are: 1. When both NAS-IP-Address and NAS-Port are present in Accounting-Requests, is checkrad or radwho using them to send some request to the NAS ? 2. Is radutmp required for Simultaneous-Use enabling ? 3. If radutmp is not required, is an SQL database required for Simultaneous-Use ? Best regards