MAC address of RCM 5600W?

Hi, do anyone know how to determine the MAC address of the development kit?

From …\Samples cpip\DISPLAY_MAC.C:

ifconfig(iface, IFG_HWA, buffer, IFS_END);

it always states “waiting for interface.” i do not know what is the problem. but i still don’t get the MAC address. Or which setting do u know i should take note of?