[Winpcap-users] Getting a MAC Address

[:: [F]usion[S]tream :: -- Gmail]

How does one go about retrieving a MAC Address from a device that is not 
on a local network. Spent 2 days working on ARP before realising that it 
supposedly only works on the local network (even though wikipedia seems 
to say otherwise).

Say the device is behind a NAT, when i want to start sending data down 
the line, do i use the MAC of the device behind the NAT or the MAC of 
the router itself?

Cheers,
Shawn.