ng_netflow 的使用方法

# /usr/sbin/ngctl -f- <<-SEQ
mkpeer fxp0: tee lower right
connect fxp0: fxp0:lower upper left
mkpeer fxp0:lower netflow right2left iface0
name fxp0:lower.right2left netflow
msg netflow: setifindex { iface=0 index=5 }
connect fxp0:lower netflow: left2right iface1
msg netflow: setifindex { iface=1 index=6 }
mkpeer netflow: ksocket export inet/dgram/udp
msg netflow:export connect inet/127.0.0.1:9991
SEQ