If ipfw_netflow_fib, the ipfw rule will only match packets in that FIB.
While here correct some value in rc.conf(5) to be int and not str.
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The default is to export netflow data on localhost on the netflow port.
ngtee is used to have the lowest overhead possible.
The ipfw ng hook is the netflow port (it can only be numeric)
Default is netflow version 5.
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Reviewed by: bapt (earlier version), olivier (earlier version)