Changing MAC Address in Red Hat Enterprise Linux

Note:
Change the HWADDR to MACADDR.
This change is persistent across reboots.
Tested OK on RHEL 5.5.

[root@localhost /]# cat /etc/sysconfig/networking/devices/ifcfg-eth0 
# Intel Corporation 82545EM Gigabit Ethernet Controller (Copper)
DEVICE=eth0
BOOTPROTO=none
MACADDR=00:0C:29:11:22:33
ONBOOT=yes
NETMASK=255.255.255.0
IPADDR=192.168.18.123
GATEWAY=192.168.18.1
TYPE=Ethernet
USERCTL=no
IPV6INIT=no
PEERDNS=yes
[root@localhost /]# 
[root@localhost /]# ifconfig eth0
eth0      Link encap:Ethernet  HWaddr 00:0C:29:11:22:33  
          inet addr:192.168.18.123  Bcast:192.168.18.255  Mask:255.255.255.0
          inet6 addr: fe80::20c:29ff:fe11:2233/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:562 errors:0 dropped:0 overruns:0 frame:0
          TX packets:47 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:54763 (53.4 KiB)  TX bytes:6646 (6.4 KiB)

[root@localhost /]#