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NAME

ipfw

 - IP packet filter and traffic accounting

 

SYNOPSIS

options IPFIREWALL

Other kernel options related to
which may also be useful are:

options IPFIREWALL_DEFAULT_TO_ACCEPT options IPFIREWALL_FORWARD options IPFIREWALL_VERBOSE options IPFIREWALL_VERBOSE_LIMIT=100

To load
as a module at boot time, add the following line into the loader.conf5 file:

ipfw_load="YES"

DESCRIPTION

The default behavior of is to block all incoming and outgoing traffic. This behavior can be modified, to allow all traffic through the firewall by default, by enabling the IPFIREWALL_DEFAULT_TO_ACCEPT kernel option. This option may be useful when configuring for the first time. If the default 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 , 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.

Policy routing and transparent forwarding features of can be enabled by IPFIREWALL_FORWARD kernel option.

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

SEE ALSO

Index

NAME

SYNOPSIS

DESCRIPTION

SEE ALSO

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