Our infrastructure requires that we run both ip flow ingress _and_ ip
flow egress on several interfaces.

The result is that the netflow data received by nfcapd is containing
redundant information and it basically tells us that we are having
twice as much traffic than we really have.

Is there a way to have some interfaces (multiple routers - one
collector) removed before the data is written to file?

I know you can do rules once the raw data is stored on the hard drive.
However the bigger issue is that we are currently collecting about
800MB every 5 minutes, and removing redundant flows before it is being
stored would reduce the raw data to 400MB or less and overall
performance would also be slightly better.

I am aware that sampling will dramatically reduce the flow size, but
it does not solve the core issue imho.

Any suggestions?

-Andy

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