Freenas is great for what it is. I like the fact that it is so easy to set up and work with, and you don't have to be totally frugal with your hardware / power resources to operate it very well. However, while I don't want to repeat what others have stated about needing appropriate "bridging" to connect to you NAS from your LAN. That is not a valid argument, there are many ways to do this. I would like to setup a QNAP, which is much more powerful, and cost less. But it does have many other drawbacks, limitations, and things that are less than ideal.
The risk is you would need to point your ISP DNS servers to a single IP address from the device, and change your DNS servers back to your ISP's when you are done or you are just plain wrong. There are a few ways to get around this, but the best solution is not to use a NAS at all.
FYI, Nextcloud, as suggested by @Mikensan is a good alternative to hosting a VPN server. The difference is in simply how much access/control you want. If you just want remote file access to download some movies from your server or something? Nextcloud is a great option, and a bit simpler to use and setup.
Anything ever come out of this thread? I'm trying to do the same thing for a simple photo storage server via nextcloud. I started a new thread in hopes of getting help. If anyone could recommend a solution or knowledge on setting up a VPN to access my freenas network that would be a huge help. I don't necessarily need a VPN if its not required, i just need the best way to connect to the server from away/off my home network. d2c66b5586