VLAN assignment fails for mobile devices "waking up"
recently I realized that some mobile devices (phones and tablets) have an IP in the wrong IP range. We have here several VLANs active and those devices are correctly assigned to the VLAN 30 when they initially connect to the AP. But at some point (I did not figure out exactly when this happens) the devices receive an IP from VLAN 1 (which is the default VLAN configured for the SSID). When reconnecting the device to the AP it immediately receives VLAN 30 again. I have checked my RADIUS configuration and all other places where I suspected an issue, but was not able to find the cause. Is it possible that when a device "wakes up" from sleep and reconnects to the AP (or resumes an existing connection) the RADIUS authentication, which assignes the correct VLAN) is not executed again and thus the AP considers the default VLAN? Is this something that can be fixed by using the reauthentication timer (which is 0 in my case)? Any other hint what is going wrong? We have 2 APs running here, can this be an issue with roaming?