ISPs and other internet providers as well can dynamically assign IP addresses using DHCP. The client machine knows its own IP address because the network tells the client.

I have never heard of a network routinely changing its clients' IP addresses in midsession, however, and I doubt that it occurs very often.

Cookies have the disadvantage that users can reject them and browsers can not support them. On the other hand, IP addresses are stable enough to support the session and everyone has one. It's guaranteed.

In reply to Re: Re: Re: Re: Faking an ip? by sierrathedog04
in thread Faking an ip? by EvanK

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