Skip site navigation (1)Skip section navigation (2)

FreeBSD Man Pages

Man Page or Keyword Search:
Man Architecture
Apropos Keyword Search (all sections) Output format
home | help
IPFW(4)                FreeBSD Kernel Interfaces Manual                IPFW(4)

NAME
     ipfw - IP packet filter and traffic accounting

SYNOPSIS
     To compile the driver into the kernel, place the following option in the
     kernel configuration file:

           options IPFIREWALL

     Other related kernel options which may also be useful are:

           options IPFIREWALL_DEFAULT_TO_ACCEPT
           options IPFIREWALL_VERBOSE
           options IPFIREWALL_VERBOSE_LIMIT=100

     To load the driver as a module at boot time, add the following line into
     the loader.conf(5) file:

           ipfw_load="YES"

DESCRIPTION
     The ipfw system facility allows filtering, redirecting, and other
     operations on IP packets travelling through network interfaces.

     The default behavior of ipfw is to block all incoming and outgoing
     traffic.  This behavior can be modified, to allow all traffic through the
     ipfw firewall by default, by enabling the IPFIREWALL_DEFAULT_TO_ACCEPT
     kernel option.  This option may be useful when configuring ipfw for the
     first time.  If the default ipfw behavior is to allow everything, it is
     easier to cope with firewall-tuning mistakes which may accidentally block
     all traffic.

     To enable logging of packets passing through ipfw, enable the
     IPFIREWALL_VERBOSE kernel option.  The IPFIREWALL_VERBOSE_LIMIT option
     will prevent syslogd(8) from flooding system logs or causing local Denial
     of Service.  This option may be set to the number of packets which will
     be logged on a per-entry basis before the entry is rate-limited.

     The user interface for ipfw is implemented by the ipfw(8) utility, so
     please refer to the ipfw(8) manpage for a complete description of the
     ipfw capabilities and how to use it.

SEE ALSO
     setsockopt(2), divert(4), ip(4), ipfw(8), sysctl(8), syslogd(8), pfil(9)

FreeBSD 11.0-PRERELEASE        October 25, 2012        FreeBSD 11.0-PRERELEASE

NAME | SYNOPSIS | DESCRIPTION | SEE ALSO

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=ipfirewall&sektion=4&manpath=FreeBSD+10.3-RELEASE+and+Ports>

home | help