Sending TCP packet out to open NAT connection for communication?

If I’m hosting an application behind a NAT network and it only needs to communicate with a single endpoint can I create a NAT rule in the router by having the application behind the nat network send a TCP packet to a destination and I can listen at the destination for the source L3/4 headers to know where a tunnel is to my application?

submitted by /u/oddkidmatt
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from hacking: security in practice https://ift.tt/YrEXUJg

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