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+This modules macthes IP sets which can be defined by ipset(8).
+.TP
+[\fB!\fP] \fB\-\-set\fP \fIsetname\fP \fIflag\fP[\fB,\fP\fIflag\fP]...
+where flags are
+.BR "src"
+and/or
+.BR "dst"
+and there can be no more than six of them. Hence the command
+.nf
+ iptables \-A FORWARD \-m set \-\-set test src,dst
+.fi
+will match packets, for which (depending on the type of the set) the source
+address or port number of the packet can be found in the specified set. If
+there is a binding belonging to the mached set element or there is a default
+binding for the given set, then the rule will match the packet only if
+additionally (depending on the type of the set) the destination address or
+port number of the packet can be found in the set according to the binding.