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NetBSD 6.1.5 - man page for ipnat (netbsd section 8)

IPNAT(8)										 IPNAT(8)

       ipnat - user interface to the NAT subsystem

       ipnat [ -dhlnrsvCF ] [ -M core ] [ -N system ] -f <filename>

       ipnat  opens  the  filename given (treating "-" as stdin) and parses the file for a set of
       rules which are to be added or removed from the IP NAT.

       Each rule processed by ipnat is added to the kernels internal lists if there are no  pars-
       ing  problems.	Rules  are  added to the end of the internal lists, matching the order in
       which they appear when given to ipnat.

       Note that ipf(8) must be enabled (with ipf -E) before NAT is configured, as the same  ker-
       nel  facilities	are  used  for NAT functionality.  In addition, packet forwarding must be
       enabled.  These details may be handled automatically when ipnat is run  by  rc  at  normal
       system startup.	See options(4), sysctl(8), and rc.conf(5) for more information.

       -C     delete all entries in the current NAT rule listing (NAT rules)

       -d     Enable printing of some extra debugging information.

       -F     delete  all  active  entries in the current NAT translation table (currently active
	      NAT mappings)

       -h     Print number of hits for each MAP/Redirect filter.

       -l     Show the list of current NAT table entry mappings.

       -n     This flag (no-change) prevents ipf from actually making any ioctl  calls	or  doing
	      anything which would alter the currently running kernel.

       -r     Remove matching NAT rules rather than add them to the internal lists.

       -s     Retrieve and display NAT statistics.

       -v     Turn  verbose mode on.  Displays information relating to rule processing and active
	      rules/table entries.

       /usr/share/examples/ipf	Directory with examples.

       ioctl(SIOCGNATS): Input/output error Ensure that the  necessary	kernel	functionality  is
       present and ipf enabled with ipf -E.

       ipnat(5), rc.conf(5), ipf(8), ipfstat(8)


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