Hi Terry,

> If I can get this working with my simulated WMT network here in my
> home, then the on-site volunteer should only have to set up port
> forwarding on the Office Router.  Surely he'd have to do that anyway,
> whether we used VPN or SSH ultimately?

Ultimately, but if the r-r Pi is allowed to the Internet by the existing
router configuration then the SSH reverse tunnel works before changing
the router.  Even if you have VPN and router-changes working, you might
still want to have it running as a backup access method.

> The 'simulated WMT network' is a physical representation of the real
> network at WMT, so I have an RPi3 with the Webserver software on it
> (and ulimately the VPN if I can get it to co-exist with nodogsplash).

If you understand the method nodogsplash uses for control and want to
get something working alongside it, whether SSH, OpenVPN, or Wireguard,
then
https://developers.redhat.com/blog/2018/10/22/introduction-to-linux-interfaces-for-virtual-networking/
might be useful in understanding all the terms and what they provide.

-- 
Cheers, Ralph.

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