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The mapping is helpful but not a security benefit. The latter can be done with a firewall.
Yes. But that's no longer just a reverse proxy. The reverse proxy isn't itself a security tool.
I see a lot of vacuous security advice in this forum. "Install a firewall", "install a reverse proxy", etc. This is mostly useless advice. Yes, do those things but they do not add any protection to the service you are exposing.
A firewall only protects you from exposing services you didn't want to expose (e.g. NFS or some other service running on the same system), and the rproxy just allows for host based routing. In both cases your service is still exposed to the internet. Directly or indirectly makes no significant difference.
What we should be advising people to do is "use a valid ssl certificate, ensure you don't use any application default passwords, use very good passwords where you do use them, and keep your services and servers up-to-date".
A firewall allowing port 443 in and an rproxy happily forwarding traffic to a vulnerable server is of no help.
You can’t port map the same port to different services on a firewall. Reverse proxy lets you open one port and have multiple services on it. Firewall can protect exposed services one I geoip block every country but my own two use crowded to block what they consider malicious ips.
They're a part of the mix. Firewalls, Proxies, WAF (often built into a proxy), IPS, AV, and whatever intelligence systems one may like work together to do their tasks. Visibility of traffic is important as well as the management burden being low enough. I used to have to manually log into several boxes on a regular basis to update software, certs, and configs, now a majority of that is automated and I just get an email to schedule a restart if needed.
A reverse proxy can be a lot more than just host based routing though. Take something like a Bluecoat or F5 and look at the options on it. Now you might say it's not a proxy then because it does X/Y/Z but at the heart of things creating that bridged intercept for the traffic is still the core functionality.