Posted by David, Surrey UK on August 27, 2007 at 04:09:53 from (84.9.75.186):
In Reply to: OT IP addresses posted by 550Doug on August 26, 2007 at 15:41:44:
Your IP address can be either static (unchanging) or dynamic (gets assigned by your ISP when you log on). Most dial-ups are dynamic and most broadband connections are static, but there are exceptions -- I used to have a static dial-up IP address but now I have a dynamic broadband one!
Also if more than one computer shares the connection, you'll probably be using NAT (network address translation). Within the local network each computer has its own address, but externally they all look like the same address. Your router makes sure incoming packets go to the right computer.
It's also possible to spoof IP addresses. Don't ask me how, I have no idea!
The upshot of all this is that an IP address is almost useless for identifying a computer or an individual, as far as ordinary people are concerned. However, criminals, hackers and terrorists can be tracked down, at some expense, by the powers that be.
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