I looks like a great idea for what you just stated but what if your isp have this brilliant idea to rearrange all the ip addresses (they do that from time to time, god knows why) Any way you'll try to log on but it won't work, no way of knowing what your new ip will be so chances are you blocked it, you can't log on any more. Also you can't change the setting because... well the ip address is blocked, most providers here will give you an "fixed" ip address, but chances are it will be changed without you knowing it. So altho I really really like the idea, for those reasons it will be hard to implement Maybe set a password to change the setting? But then you already log on with a password.......