Everything here is my opinion. I do not speak for your employer.
Truth in Amtrak announcements: "This will be the most important question you ask us today: why isn't the wifi working? Because we're in Canada. Wifi doesn't work in Canada. Once we cross over into the United States, we will pick up the wifi signal. And it will be terrible."
Try Tailscale: mesh networking, centralized administration, WireGuard.
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