Linux.com: CLI for Noobies: Network Tools, Can You Dig It?

"The typical home user connects to the Internet with a dynamically assigned IP address. Assignment of these temporary IP addresses is automated thanks to something called DHCP: Dynamic Host Configuration Protocol. What that means in practical terms is that the IP address that identifies you on the Internet today may point at someone else tomorrow. So if you have a dynamically assigned IP address and set up a server of some kind on the Internet, users who access it today might not be able to find it tomorrow.

"Some broadband users may have the same dynamic IP address for months at a time. Many dialup users never get the same one twice. But neither can count on having the same address the next time they connect to the Internet..."

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