This is a cool tool to change MAC address and change IP.

The tool is very light, easy to use (just do a macshift then enter, it will give you instructrion).

It's best for QA Engineer who want to test their system.

http://www.tanhuynh.com/macshift.exe

eg:

cmd -macshift -i "Local Area Connection" 001100110011

or type it directly in command prompt.