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+This target is only valid in the
+table, in the
+chain. It specifies that the source address of the packet should be
+modified (and all future packets in this connection will also be
+mangled), and rules should cease being examined. It takes one type
+.BR "--to-source " "\fIipaddr\fP[-\fIipaddr\fP][:\fIport\fP-\fIport\fP]"
+which can specify a single new source IP address, an inclusive range
+of IP addresses, and optionally, a port range (which is only valid if
+the rule also specifies
+.B "-p tcp"
+.BR "-p udp" ).
+If no port range is specified, then source ports below 512 will be
+mapped to other ports below 512: those between 512 and 1023 inclusive
+will be mapped to ports below 1024, and other ports will be mapped to
+1024 or above. Where possible, no port alteration will occur.
+You can add several --to-source options. If you specify more
+than one source address, either via an address range or multiple
+--to-source options, a simple round-robin (one after another in
+cycle) takes place between these adresses.