Why does a computer's IP address change by minute that so quick?

What could cause IP-addresses to be different in one computer?

My Perl variable $ENV{'REMOTE_ADDR'} differs all the time. What开发者_JAVA百科 could cause this to happen?

Most people do not have fixed IP addresses. They may change daily, or when their connection to their ISP is reset, or all the time if they are behind some kind of proxying layer that may route requests through more than one system.

REMOTE_ADDR refers to the client address, so would be different if you have multiple clients.

If you are testing with one client, perhaps your network interface has multiple IP addresses or you're observing this behavior over time when your IP has changed due to DHCP?