#cat ng5_netflow.sh

   #!/bin/sh

   kldload ng_netflow
   kldload ng_ether
   kldload ng_tee
   kldload ng_one2many

   /usr/sbin/ngctl -f- <<-SEQ
     mkpeer em2: tee lower right
     connect em2: em2:lower upper left
     name em2:lower em2_tee
     mkpeer  em2:lower netflow  right2left iface0
     name em2:lower.right2left netflow
     msg netflow: setifindex { iface=0 index=1 }
     connect em2:lower netflow: left2right iface1
     msg netflow: setifindex { iface=1 index=1 }

     mkpeer vlan254: tee lower right
     connect vlan254: vlan254:lower upper left
     name vlan254:lower vlan254_tee
     connect vlan254:lower netflow:  right2left iface3
     msg netflow: setifindex { iface=3 index=1 }
     connect vlan254:lower netflow: left2right iface4
     msg netflow: setifindex { iface=4 index=1 }

     mkpeer vlan22: tee lower right
     connect vlan22: vlan22:lower upper left
     name vlan22:lower vlan22_tee
     connect vlan22:lower netflow:  right2left iface5
     msg netflow: setifindex { iface=5 index=1 }
     connect vlan22:lower netflow: left2right iface6
     msg netflow: setifindex { iface=6 index=1 }

     mkpeer vlan21: tee lower right
     connect vlan21: vlan21:lower upper left
     name vlan21:lower vlan21_tee
     connect vlan21:lower netflow:  right2left iface7
     msg netflow: setifindex { iface=7 index=1 }
     connect vlan21:lower netflow: left2right iface8
     msg netflow: setifindex { iface=8 index=1 }

     mkpeer netflow: ksocket export inet/dgram/udp
     msg netflow:export connect inet/127.0.0.1:20001
   SEQ