my external ip address, which I found by going to a site called http://www.findmyipaddress.com/ , and it shows in the browser an ip address starting with 203 the same on all computers in the building.
however, when I go to each computer, and on the command line, go to ipconfig, it shows a single address called the "default gateway" and it differs from the external IP address and starts from 192. it is also the same for all computers in the building .
so what is a default gateway that starts at 192. and how does it differ from an external IP address that starts at 203?
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Your default gateway is a node that directs all traffic to the outside world from your network, and all these computers route through it. And then this external ip is either located on this default gateway, or any other adapter, or then it connects directly to the Internet router