Before you start playing with IPFilter you need to enable it first:
ipf -E
This can be done automatically by setting "ipfilter=YES" in /etc/rc.conf and rebooting.
ipf -F <i|o|a> : will flush the input/output/all rules
ipf -f <filename> : will load the rule from file
Read this pdf:
http://www.cs.utexas.edu/users/vin/Classes/CS395T-Fall03/Readings/ipf-howto.pdf
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