> You need DNAT, as described here:
>
> https://shorewall.org/two-interface.htm#DNAT


Ok. That is what I started with.

There is no advice or example there for how to get that traffic through the VPN 
to the back end server.

Can you help with the rules?

My test for this working is to

telnet -4 1.2.3.4 1234

from any public site and to get a response from the back end server.

If I have a service ON the external server I am able to give access to it.

But so far, if there is no service on the external server, only on the internal 
one, across the VPN, I only get

 telnet -4 1.2.3.4 1234
  Trying 1.2.3.4...
  telnet: connect to address 1.2.3.4: Connection refused

Jan


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