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Date: Wed, 30 Aug 2006 21:06:17 +0200
From: Miroslav Lachman <000.fbsd@quip.cz>
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To: Stephen.Clark@seclark.us
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Cc: freebsd-net@freebsd.org
Subject: Re: Tee packets
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Stephen Clark wrote:

> Hello List,
> 
> We have a monitoring app that receives udp packets from units in the 
> field. We are in
> the process of increasing the number of units we have reporting and are 
> seeing some
> performance issues with our current hardware. I would like be able to 
> somehow route a
> copy of each packet to another machine so I can test out different 
> hardware configurations
> to see how performance is affected.
> 
> Any ideas on the best way to do this?

If you are using PF as your firewall, you can use dup-to (man pf.conf)

"The dup-to option creates a duplicate of the packet and routes it
like route-to.  The original packet gets routed as it normally would."

Miroslav Lachman