Also if you use the STB & follow these instructions, youl spend more time trying to provision your pc & new mac addy's than you will be online.
Just leave your mac address alone & reboot the pc / Cm / STB in the long run it will be easier for you.
the only reason your going to want to play with mac addresses is when spoofing a mac onto a router, or your trying to do something you really shouldnt be doing...
Barfly