.\"
.\" $FreeBSD$
.\"
.Dd October 28, 2002
.Dt IPFW 4
.Os
.Sh NAME
.Nm ipfw
.Nd IP packet filter and traffic accounting
.Sh DESCRIPTION
The
.Nm
system facility allows filtering,
redirecting, and other operations on
.Tn IP
packets travelling through
network interfaces.
.Pp
The user interface for
.Nm
is implemented by the
.Xr ipfw 8
utility, so please refer to the
.Xr ipfw 8
manpage for a complete description of the
.Nm
capabilities and how to use it.
.Ss Kernel Options
The following options in the kernel configuration file are related to
.Nm
operation:
.Pp
.Bl -tag -width ".Dv IPFIREWALL_VERBOSE_LIMIT" -compact
.It Dv IPFIREWALL
enable
.Nm
.It Dv IPFIREWALL_VERBOSE
enable
.Nm
logging
.It Dv IPFIREWALL_VERBOSE_LIMIT
limit
.Nm
logging
.It Dv IPDIVERT
enable
.Xr divert 4
sockets
.El
.Sh SEE ALSO
.Xr setsockopt 2 ,
.Xr divert 4 ,
.Xr ip 4 ,
.Xr ipfw 8 ,
.Xr sysctl 8 ,
.Xr syslogd 8 ,
.Xr pfil 9