Tracking Users By IP Address

[Paul McNett]

Richie Hindle writes:

> [Peter]
>
> > If I expected many visitors
> > from corporate environments, I'd not think this approach
> > would have a "reasonably low margin of error".  Almost any
> > such environment will have a firewall and masquerade
> > multiple users as the same address.
>
> Some (many? all? negligibly few? I don't know) proxy
> firewalls will tell you which internal address the request
> came from, so you can combine the two to get a unique address
> for that user.

I'd say "negligibly few", since there really isn't good reason 
to give the world your internal ip address. Anyway, you can't 
count on it, and you wouldn't have a basis to know what 
percentage weren't unique.

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-- 
Paul McNett
Independent Software Consultant
http://www.paulmcnett.com