no, I think you link your internal ip address to the properties, but I might be wrong.
No, because every different type of internal IP. So for say I have a NetGear N RangeMax router, my Internal IP would be 192.168.1.1. But my IP is 22.214.171.124. If you had the same type of router, your Ip would be the same as mine.
BTW, I got a new router from AT&T so that was just an example.