Comment 5 for bug 1382258

The MAC address is shared between the AMT controller and the host, so we can't configure the controller's IP address independently of the host's, and it may change as MAAS does its thing. MAAS doesn't know that there's a relationship there, but always working from the MAC address is always going to get you to the right controller. This lookup is done by the power driver; amttool is only ever given an IP address.