IPFW(4) 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 opera- tions 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 fire- wall by default, by enabling the IPFIREWALL_DEFAULT_TO_ACCEPT kernel op- tion. 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 11.1 October 25, 2012 IPFW(4)
NAME | SYNOPSIS | DESCRIPTION | SEE ALSO
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