Tracking Users By IP Address
fakeaddress at nowhere.org
Fri Oct 8 04:32:34 CEST 2004
Nick Craig-Wood wrote:
> Paul McNett <p at ulmcnett.com> wrote:
>> 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.
> An awful lot of proxies do do exactly that (I used this technique
> HTTP_X_FORWARDED_FOR and REMOTE_ADDR are the headers you want
Many open proxies do that to avoid being bad net-citizens. It
is not common practice for NAT gateways and enterprise proxies.
> Its not safe to use this as a unique address for a user but if
> you are interested in exactly where your users are (for fraud
> checking purposes) its a useful technique.
It can detect fraud, but there are enough transparent proxies
that it cannot detect absence of fraud.
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