I use macchanger:
$ sudo yum install macchanger
...
$ macchanger --help
GNU MAC Changer
Usage: macchanger [options] device
-h, --help Print this help
-V, --version Print version and exit
-s, --show Print the MAC address and exit
-e, --ending Don't change the vendor bytes
-a, --another Set random vendor MAC of the same kind
-A Set random vendor MAC of any kind
-p, --permanent Reset to original, permanent hardwareMAC
-r, --random Set fully random MAC
-l, --list[=keyword] Print known vendors
-b, --bia Pretend to be a burned-in-address
-m, --mac=XX:XX:XX:XX:XX:XX Set the MAC XX:XX:XX:XX:XX:XX