It's also really frustrating at a hardware company to have to submit a ticket to IT and wait several days to add a new device to the network or create a private, non-MAC-secured VLAN for testing prototypes.
The little white box could incorporate an Ethernet switch. Then just reconnect an existing device on the network through it, and sniff traffic to find out the MAC.
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Locking down network ports to the mac-address makes this kind of attack in-feasible, but it's rarely done.
It's also really frustrating at a hardware company to have to submit a ticket to IT and wait several days to add a new device to the network or create a private, non-MAC-secured VLAN for testing prototypes.
The little white box could incorporate an Ethernet switch. Then just reconnect an existing device on the network through it, and sniff traffic to find out the MAC.
Whilst possible, this is a) more unsubtle and b) still limited to a single device - but good point.