Wireguard + DDNS

In your absence, I played around and the only thing that doesn't work is access via a mobile network. Perhaps the mobile provider uses such an enemy NAT of the possible or other problems)

Can the laptop connect when connecting from a remote network that is not cellular?

Can the laptop connect when connecting from a remote network that is not cellular?

Yes.
If anything, the mobile network was used only for tests. She is not the target)

Odd that the mobile network isn't working... I don't know why that would be.

But, at this point, you can try the other remote peer/client device again. See if it connects and is able to reach the server and vice versa.

Thank you for helping.
--offtop--
Now I wonder what kind of hardware is needed so that the speed is at least 5-8MiB/s, otherwise I don't have more than 1.5 (CPU full load)
One of the nice things is the low latency over RDP

I've used a Ubiquiti RouterStation Pro and seen ~30Mbps with WireGuard. That is a device that was released in 2009, and has a single core 680MHz AR7161 SoC.

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