Finding the hardware address in Linux

In a command tool window enter

        /sbin/ifconfig -a

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.