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src/freedombone-prep

 $SUDO sed -i "/iface eth0 inet static/a\    address $BBB_FIXED_IP_ADDRESS" $MICROSD_MOUNT_POINT/$ROOTFS/etc/network/interfaces
 $SUDO sed -i '/iface usb0 inet static/,/    gateway 192.168.7.1/ s/^/#/' $MICROSD_MOUNT_POINT/$ROOTFS/etc/network/interfaces
 
+hexarray=( 1 2 3 4 5 6 7 8 9 0 a b c d e f )
+a=${hexarray[$RANDOM%16]}${hexarray[$RANDOM%16]}
+b=${hexarray[$RANDOM%16]}${hexarray[$RANDOM%16]}
+c=${hexarray[$RANDOM%16]}${hexarray[$RANDOM%16]}
+d=${hexarray[$RANDOM%16]}${hexarray[$RANDOM%16]}
+$SUDO sed -i "s|#hwaddress ether.*|hwaddress ether DE:AD:$a:$b:$c:$d|g" $MICROSD_MOUNT_POINT/$ROOTFS/etc/network/interfaces
+
 $SUDO sed -i "s/nameserver.*/nameserver $NAMESERVER1/g" $MICROSD_MOUNT_POINT/$ROOTFS/etc/resolv.conf
 $SUDO sed -i "/nameserver $NAMESERVER1/a\nameserver $NAMESERVER2" $MICROSD_MOUNT_POINT/$ROOTFS/etc/resolv.conf