Hello,
This happens when you have a network setup in your home or there is a routing device which is more a case with most of the Broadband users where you have an internal IP Address assigned to your computer by the Routing device and it has an external IP Address (assigned by ISP) with which it talks to the internet.
So the one in msconfig is a Private IP Address and the on you see on whatismyip.com is called a Public IP Addresses.
Moved to Internet & Networking.
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