macchanger

а чем сам макченжер неугодил?

Чем не катит ifconfig?
В man ifconfig

 hw class address
              Set the hardware address of this interface, if the device driver
              supports  this  operation.   The keyword must be followed by the
              name of the hardware class and the printable ASCII equivalent of
              the  hardware  address.   Hardware  classes  currently supported
              include ether (Ethernet), ax25 (AMPR AX.25), ARCnet  and  netrom
              (AMPR NET/ROM).