From: Alexander Klimov (alserkliinbox.ru)
Date: Sat Jul 30 2005 - 02:04:58 CDT

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On Sun, 24 Jul 2005, Bojan Zdrnja wrote:
> Regarding Google - yes, if you log only connections.
> However, when you use translate.google.com service, Google will add a new
> header in the HTTP request:
>
> X-Forwarded-For: <IP address>
>
> All proxy servers should add this header, even in the case of multiple
> proxying, in which case all IP addresses should be listed under this header.
>
> For Apache, there is even a mod_extract_forwarded module which should change
> the connection so it looks like it's coming from the IP behind the proxy
> server.
>

If you do assume that x-forwarded-for is always genuine then you will
have problems when somebody with direct connection adds
x-forwarded-for to confuse you (this is very similar to email
headers).

BTW: I don't sure that it is that important for real attackers -- most
of them are likely to use owned hosts anyway.

--
Regards,
ASK

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