Get MAC Address Of Device On The Other End Of Crossover Cable

If you have a SonicWall UTM available to you, connect to it.  Monitor the logs, if the device is on a different subnet, you'll get a spoofing notification with the IP in question (if the device has an IP already assigned to it).  I believe the MAC address will also show in the logs.  Now I'm guessing that other firewalls/UTMs will also have similar alerting. 

Hey guys
So I got a proprietary device which I need the MAC address for in order to set the IP and reset credentials via a weird web UI, and the MAC is not written anywhere. 
So I connected this device to my laptop via a crossover cable and tried to nmap various common subnets (including the entire private space) to see if it maybe had a static IP. No dice. So how can I get the MAC address of this device using only my laptop, since I can't get into it?
This topic first appeared in the Spiceworks Community

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