ipfilter/man/ipfilter.5

    ipfilter.5 revision 256281
     $FreeBSD: stable/10/contrib/ipfilter/man/ipfilter.5 92691 2002-03-19 11:48:16Z darrenr $
 IPFILTER 1
 NAME
IP Filter
 DESCRIPTION

IP Filter is a package providing packet filtering capabilities for a variety
of operating systems. On a properly setup system, it can be used to build a
firewall.
 SEE ALSO
ipf(8), ipf(1), ipf(5), ipnat(8), ipnat(5), mkfilters(1)