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diff --git a/trunk/extensions/libipt_NETMAP.man b/trunk/extensions/libipt_NETMAP.man
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+This target allows you to statically map a whole network of addresses onto
+another network of addresses.  It can only be used from rules in the
+.B nat
+table.
+.TP
+\fB--to\fP \fIaddress\fP[\fB/\fP\fImask\fP]
+Network address to map to.  The resulting address will be constructed in the
+following way: All 'one' bits in the mask are filled in from the new `address'.
+All bits that are zero in the mask are filled in from the original address.