you can use the same outside address for different host with different ports, for example if you have an FTP server do static for 21 tcp port, and 25 tcp port for another server.
As per my point of view, you can map only one internal IP with outside IP, it is possible only in the case of differnt ports otherwise for the same port or same servive it is not possible.
if u want to do static nat for one public ip to two internal private ip then its not possible but u can do it for two different ports .
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