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this post was submitted on 17 Jun 2023
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Technology
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I don‘t know what specifically you would like to know and what your background is, so I will just elaborate a bit more.
The basic idea is that the VPS, which is not behind a NAT and has a static IP, listens on a port for WireGuard connections. You connect from the NAS to the VPS. On the NAS you configure the WireGuard connection with “PersistentKeepalive = 25”. That makes the NAS send keepalive packets every 25 seconds which should be enough to keep the connection alive, meaning that it keeps a port open in the firewall and keeps the NAT mapping alive. You now have a reliable tunnel between your VPS and your NAS even if your IP address changes at home.
If you can get a second (public) IP address from your provider you could even give your NAS that IP address on its WireGuard interface. Then, your VPS can just route IP packets to the NAS over WireGuard. No reverse proxy needed. You should get IPv6 addresses for free. In fact, your VPS should already have at least a /64 IPv6 network for itself. For an IPv4 address you will have to pay extra. You need the reverse proxy only if you can‘t give a public IP address to your NAS.
Edit: If you have any specific questions, feel free to ask.