it is very helpul to set an unique IP for request to radius server. Some customers need to force firewall to accept request only from determinate IP, one rule for each IP. So, like aruba and cisco, I would like to set an IP unique for all AP request.
Could you please add some more details here? If two APs have IPs 192.168.0.1 and 192.168.0.2, each would use its own IP address to send the packet to the RADIUS server… were you looking for AP2 to proxy the request through AP1?
or on a single AP with multiple L3 interfaces (with say IPs 192.168.0.1, 172.16.1.1 you want to control what IP the AP uses in the transmit?)