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ipfw(4)

To compile the driver into the kernel, place the following option
in  the  kernel  configuration file: Other related kernel options
which may also be useful are: To load the driver as a  module  at
boot  time, add the following line into the file: ipfw_load="YES"
The system facility allows filtering, redirecting, and other  op‐
erations  on  packets travelling through network interfaces.  The
default behavior of is to block all incoming and  outgoing  traf‐
fic.  This behavior can be modified, to allow all traffic through
the firewall by default, by enabling the kernel option.  This op‐
tion  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
kernel option.  The option will prevent 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 is  im‐
plemented  by  the  utility, so please refer to the manpage for a
complete description of the capabilities and how to use it.















































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