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Port forwarding (port mapping) is a network address translation (NAT) technique to redirect communication requests from one address/port to another. It is used to reach services on a host residing on a masqueraded internal network, e.g. a Raspberry Pi on a home networked.
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How do I protect a port that I need to open for my VPN server?
You could use port knocking; using something like knockd (See details here https://www.vultr.com/docs/port-knocking-on-debian or here https://www.digitalocean.com/community/tutorials/how-to-use-port-k …