Similar to SNAT/DNAT depending on chain: it takes a range of addresses (`--to 1.2.3.4-1.2.3.7') and gives a client the same source-/destination-address for each connection.

--to <ipaddr>-<ipaddr>
    Addresses to map source to. May be specified more than once for multiple ranges.

--nodst
    Don't use the destination-ip in the calculations when selecting the new source-ip