Netflow sensor/generator for Freebsd

Hello everyone,

I'd like to inspect the flows in and out of my fbsd boxes. In order to
closely simulate a true netflow-capable router, I found out I need
three components: flow sensors, flow collector and flow analyzer.

There are quite a few solutions for collecting and analyzing flows,
even some written in Java. My question is what should I use for a flow
sensor. I did some research and googled quite a bit to find out the
following tools capable of exporting netflow records:

softflowd
fprobe
ipcad
ng_netflow
pfflowd (in combination with pf)

Since the feedback information is rather scarce on these tools, could
you share your experiences with any of these tools? Have I missed some
good ones? Which one should I prefer?

Thanks for any response!

Nino
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