the OID in FortiNAC is for a stored model of the Firepower, yours might be different than the one that has been stored. That you can select it, tells me that the device is not supported out of the box, you will need to try to map this to a different OID that might fit, best with a similar name or a device fitting the description. Generic advice, I know; in case of the firepower there might be no better matching device.
What is the problem actually? You cannot model the device correctly?
the currently OID detected is 18.104.22.168.4.1.8072.3.2.10
i didn't get any result of snmpwalk is unkown host
i need to add L3 device like firewall FMC to make the authentication 802.1X because i can't see the IP for each MAC users in our L2 devices (switch cisco) or you recommend another way to see the IP of each MAC !
The only way would be to either have the Persistent Agent on the device which would report the IP (if it can be installed on it) or have an L3 device modeled in the FortiNAC so that its ARP table can be polled and the IP be mapped to the MAC of the host.
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