Check out pfflowd. 

Configuration of NetFlow, Flowtools, pfflowd on OpenBSD
http://www.pantz.org/software/flowtools/configflowtoolspfflow.html
 
--
 Calomel @ http://calomel.org
 Open Source Research and Reference


On Fri, Feb 15, 2008 at 09:22:33AM -0500, Richard Daemon wrote:
>Hi all,
>
>Does anyone know how I can go about monitoring bandwidth usage based on
>ports (or service) and maybe client as well?
>I have checked and tried both pfstat and symon and they're both great at
>what they do, but not fully what I'm looking to do.
>
>As for Cacti, I will be trying to get working this weekend in the chroot as
>there's no port yet, unfortunately, but I don't think it will quite do what
>I'm seeking either.
>
>In other words, what I'm looking to do is mainly to monitor and graph the
>average (baseline) bandwidth usage for a few systems and to know what ports
>are mostly used (ftp, http, https, ssh, etc.) and how much bandwidth they
>consume or need, on average.
>
>By doing this, I can also better adjust my ALTQ rules accordingly.
>
>TIA.

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