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I can't offer you specific advice about how Linux does it, but are you aware that running portmap bound to a public/global IP is a very bad idea? If possible, use a private LAN, RFC1918 IPs, and firewalling; if the servers are separate then use some sort of encrypted tunnel to connect them.
If it's for shifting content around and you don't need 'realtime' access then consider using something like rsync over ssh...
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