No, you are mixing up two different things. The GL-iNet routers run OpenWRT. The OpenWRT software is configured using a series of files, mostly in the /etc directory. They can be edited directly, or they can be manipulated using the uci program (universal command interface). LuCI is a web-based program, with a series of additional modules, that is a much easier way to do most of that.

GL-iNet is a program that also runs on top of OpenWRT and is an even easier way to accomplish most of what you can do with LucI. Not everything, mind you. So for example you can install the adblock plugin from the GL-iNet interface, but you can’t configure it from there; you have to do that with Luci. But VPN client/server is one of the things that is most easily done through the GL-iNet interface.

If you want to connect to a VPN provider as a client, you upload the config file through GL-iNet; you don’t need Luci at all.

Not sure I follow what you mean by “two devices”.

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