1.\" 2.\" $FreeBSD: src/share/man/man4/ipfirewall.4,v 1.19.2.7 2002/11/18 21:51:16 luigi Exp $ 3.\" $DragonFly: src/share/man/man4/ipfirewall.4,v 1.4 2006/04/02 16:50:05 swildner Exp $ 4.\" 5.Dd June 22, 1997 6.Dt IPFW 4 7.Os 8.Sh NAME 9.Nm ipfw 10.Nd IP packet filter and traffic accounting 11.Sh DESCRIPTION 12.Em ipfw 13is a system facility which allows filtering, 14redirecting, and other operations on IP packets travelling through 15system interfaces. 16.Pp 17The user interface for 18.Em ipfw 19is implemented by the 20.Nm ipfw 21program, so the reader is referred to the 22.Xr ipfw 8 23manpage for a complete description of the capabilities of 24.Em ipfw 25and how to use it. 26.Sh KERNEL OPTIONS 27The following options in the kernel configuration file are related to 28.Em ipfw 29operation: 30Options in the kernel configuration file: 31.Bl -tag -width ".Cd options IPFIREWALL_VERBOSE_LIMIT" 32.It Cd options IPFIREWALL 33enable 34.Nm 35.It Cd options IPFIREWALL_VERBOSE 36enable firewall logging 37.It Cd options IPFIREWALL_VERBOSE_LIMIT 38limit firewall logging 39.It Cd options IPDIVERT 40enable 41.Xr divert 4 42sockets 43.El 44.Sh SEE ALSO 45.Xr setsockopt 2 , 46.Xr divert 4 , 47.Xr ip 4 , 48.Xr ipfw 8 , 49.Xr sysctl 8 , 50.Xr syslogd 8 51