:http://www.manpagez.com/man/8/ifconfig/
Prueba con
ifconfig eth2 lladdr A:B:C:1:2:3
lladdr addr
Set the link-level address on an interface. This can be used to
e.g. set a new MAC address on an ethernet interface, though the
mechanism used is not ethernet-specific. The address addr is
specified as a series of colon-separated hex digits. If the
interface is already up when this option is used, it will be
briefly brought down and then brought back up again in order to
ensure that the receive filter in the underlying ethernet hard-
ware is properly reprogrammed.
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