hi, is a normal configuration for a meraki mx device, I use in a lot of remote offices, if one day the internet router from the provider fails or you change to another provider yo do not need to configure anything, is sufficient to say to the provider to change the router and all is going to work again. If you need to do a nat to publish a port from a internal server I recommend you to go to the internet provider router and fix by the mac address the ip assigned to the wan of the mx and put the ip assigned to the mx in dmz.
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