[hornychz]

... to be able to look at it directly from any other IP and use the GUI from Cumulus?

Allowing outside access to the Cumulus Web GUI is not a good idea, as everyone will have access to the configuration pages. There is a lot od discussions about this matter on the Cumulus forum.

The best way to do what you want, is use the RPI as a webserver, and serve the default Cumulus webpages from it, or even use the Saratoga Templates. If you don't expect too much simultaneous accesses it works pretty well.

Hi guys,

I did not understand that Mark wants to access the site directly on his RPi! (Maybe it's got my bad English,
but when I read it again, it's quite clear ...)    Mark, that's really unacceptable!

I have suggested my recommendation as CumulusMX is also designed. The Web on RPi serves for configuration
and possibly internal information, but for external access it is necessary to create a web site somewhere in the hosting
and upload your data there. You can use either CumulusMX itself or the excellent Saratoga templates as recommended
by Werk_AG, or a variety of other templates or scripts - freely on the internet or do something yourself.

But never allow free access to any of your internal server (not just CumulusMX) from outside. He would be attacked
within minutes, maybe even seconds ... (I know it very well, I also deal with the construction of firewalls.)