in your configuration, if your ADSL provider give you a fixe adress, you need to use this one for the server, not the one with 4G/LTE.

if your adls don’t give you a fix ip, you need tu a reverse dns for can know your ip (or name) as soon as your are connected.

on your adsl modem, you need to open/route the port 51830 (if i remember) for the site to site .
the second one with the LTE 4G will be the client.

when you are using share ip (like for 4G, you can only be a client.

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