41edb306f0
Through fixes and improvements our ipfilter sources have diverged enough to warrant move from contrib into sbin/ipf. Now that I'm planning on implementing MSS clamping as in iptables it makes more sense to move ipfilter to sbin. This is the second of three commits of the ipfilter move. Suggested by glebius on two occaions. Suggested by and discussed with: glebius Reviewed by: glebius, kp (for #network) MFC after: 1 month Differential Revision: https://reviews.freebsd.org/D33510
77 lines
1.8 KiB
Groff
77 lines
1.8 KiB
Groff
.\" $FreeBSD$
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.\"
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.TH IPNAT 8
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.SH NAME
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ipnat \- user interface to the NAT subsystem
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.SH SYNOPSIS
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.B ipnat
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[
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.B \-dhlnrsvCF
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]
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[
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.B \-M core
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]
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[
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.B \-N system
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]
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.B \-f <\fIfilename\fP>
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.SH DESCRIPTION
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.PP
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\fBipnat\fP opens the filename given (treating "\-" as stdin) and parses the
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file for a set of rules which are to be added or removed from the IP NAT.
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.PP
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Each rule processed by \fBipnat\fP
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is added to the kernels internal lists if there are no parsing problems.
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Rules are added to the end of the internal lists, matching the order in
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which they appear when given to \fBipnat\fP.
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.PP
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Note that if
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\fBipf(8)\fP
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is not enabled when NAT is configured, it will be enabled
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automatically, as the same kernel facilities are used for
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NAT functionality. In addition, packet forwarding must be
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enabled.
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.SH OPTIONS
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.TP
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.B \-C
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delete all entries in the current NAT rule listing (NAT rules)
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.TP
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.B \-d
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Enable printing of some extra debugging information.
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.TP
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.B \-F
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delete all active entries in the current NAT translation table (currently
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active NAT mappings)
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.TP
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.B \-h
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Print number of hits for each MAP/Redirect filter.
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.TP
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.B \-l
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Show the list of current NAT table entry mappings.
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.TP
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.B \-n
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This flag (no-change) prevents \fBipf\fP from actually making any ioctl
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calls or doing anything which would alter the currently running kernel.
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.TP
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.B \-p
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This flag is used with the \fB-r\fP flag to cause any active NAT
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sessions that were created by the rules being removed and that are
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currently active to also be removed.
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.TP
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.B \-r
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Remove matching NAT rules rather than add them to the internal lists.
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.TP
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.B \-s
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Retrieve and display NAT statistics.
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.TP
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.B \-v
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Turn verbose mode on. Displays information relating to rule processing
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and active rules/table entries.
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.DT
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.SH FILES
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/dev/ipnat
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.br
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/usr/share/examples/ipfilter Directory with examples.
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.SH SEE ALSO
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ipnat(5), ipf(8), ipfstat(8)
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