Finding the hardware address in Linux
In a command tool window enter
You should see the output which contains
eth0 Link encap:Ethernet HWaddr 00:15:B7:A6:43:81
inet addr:10.3.0.231 Bcast:10.3.0.255 Mask:255.255.255.0
inet6 addr: fe80::211:2fff:fe22:2b57/64 Scope:Link
The hardware address is on the top line after HWaddr.