Hi,

I am building new mail infrastructure in my company, and I have came to
place where it seems that os fingerprinting technique cannot be used.

This is how the situation looks like: I have couple of smtpd servers
which are collecting mails from Internet, they are working with CARP
under one IP and then they are load balanced via haproxy. They got the
mail, and send it for checks to other CARP group of servers with amavis
installed. All of them are meant to run p0f-analyzer to give other hosts
which are doing AS&AV checks bit more info, but... amavis can ask only
one host for information about IP/OS. 

The problem is - how to make those
amavis boxes to ask the proper one, this is, the one who actually
handled the connection? This is serious issue as it is rendering the
p0f functionality totally unusable in real life scenario - separated
and load balanced hosts for receiving, checking and delivering mail.

Kind regards,
Bartek Rutkowski

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