Detect Unknowed device

[paoloholzl]

There is a functioning access point TP-Link EAP225.
Cannot be managed from connected devices.
We know MAC Address because present on a label.
Is on a unknowed subnet.
But this device use gateway with Palo Alto.
We don't know IP (we have try all usal IPs).
We have try some porscan, verify with Wireshark but without result.
I have try tu access to Paolo Alto to verify arp table (also via ssh) but arp command is not present.
Howto verify if MAC address (and IP) is present?
Other ideas?

[reaper]

f your firewall's interfaces are in Layer3 mode, the arp command is

show arp all

if your interfaces are in Layer2 mode, the mac command is 

show mac all