I was trying to find a solution for network monitoring as a friend's request. OpenBSD is the firewall. I saw the Nfsen packages and installed to a 5.2 server. After some effort trying to understand what is going on behind, I realised that Netflow is a protocol by Cisco designed to export router traffic to outside. And OpenBSD has a support of it with pflow interface. First I made a new pflow0 interface like ifconfig pflow0 flowdst 127.0.0.1:9998 flowsrc 127.0.0.1 up Then made some configuration changesto /etc/nfsen.conf and /var/www/htdocs/nfsen/conf.php. Because Apache in OpenBSD runs in chrooted by default, if you dont make the necessary changes in these pages you got an error stating ERROR: nfsend connect() error: Permission denied! ERROR: nfsend - connection failed!! ERROR: Can not initialize globals! which is because apache cant reach the communication socket which is initially located at $PIDDIR/nfsen.comm namely /var/db/nfsen/run direc...
Errare humanum est sed perseverare diabolicum.