Changing my IP Address/MAC Address

Hello,

My ISP (Shaw) assigns dynamic IP addresses. I would like to be able to change it at anytime. I connect to the internet on my Mac wirelessly through my Airport Extreme Base Station.

I emailed Shaw, and they said unplugging the cable modem only resets IP address information in the modem, but does not change my IP address. This is part of the email they sent me; "IP addresses are also assigned based on your network cards unique mac address. If your network card driver or router has the option of manually changing its mac address you can randomly assign yourself a new ip address".

So, my question is, how do I change the MAC address on either my AEBS or my Mac?

Thanks in advance for any help 🙂

Tom