PF, The OpenBSD Packet Filter: Building The Network You Need: BSDCan, Ottawa, June 10th 2015
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pflow: Config The Interface

Create hostname.pflow0:

flowsrc 192.168.103.1 flowdst 192.168.103.9:3001

flowsrc = your sensor

flowdst = your collector

$ ifconfig pflow
pflow0: flags=41<UP,RUNNING> mtu 1492
        priority: 0
        pflow: sender: 192.168.103.1 receiver: 192.168.103.9:12345
        groups: pflow

+ make sure you pass the traffic from sensor to collector