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 1.2 2003/06/17 04:36:59 dillon 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.Pp 27.Sh KERNEL OPTIONS 28The following options in the kernel configuration file are related to 29.Em ipfw 30operation: 31Options in the kernel configuration file: 32.Bl -tag -width "options IPFIREWALL_VERBOSE_LIMIT" 33.It Cd options IPFIREWALL 34enable 35.Nm 36.It Cd options IPFIREWALL_VERBOSE 37enable firewall logging 38.It Cd options IPFIREWALL_VERBOSE_LIMIT 39limit firewall logging 40.It Cd options IPDIVERT 41enable 42.Xr divert 4 43sockets 44.El 45.Pp 46.Sh SEE ALSO 47.Xr setsockopt 2 , 48.Xr divert 4 , 49.Xr ip 4 , 50.Xr ipfw 8 , 51.Xr sysctl 8 , 52.Xr syslogd 8 53