How to disable NAT on a router?

Question

network hardware

Hello. The question might be dumb. Please don't throw stones. The point is this.

More than 30 days ago, I was puzzled about how to have access to my home storage (a usb pocket with a built-in 1TB screw is connected to the router.).
- Router Asus RT-AC750.
- The Internet service provider, which up to this point gave me a normal white IP address, albeit a dynamic one.

So so. I understand that sitting with a dynamic IP address, I may not have the opportunity to strain those sitting at home, so that they climb onto sites like 2ip, and tell me the address itself. And why, if the router provides the DDNS function. Set this moment. In the web face of the router, I also shared the screw, created users with certain access rights to various folders. I checked from another PC on the mobile Internet - everything is fine. VNC worked the same way.

Everything went on as usual, as last week I could not get access via FTP, supposedly there is no such address. I came home today, and in the web face of the router it says to me in yellow-in-gray

The wireless router uses a private WAN IP address. This router is in a NAT environment and the DDNS service cannot work

Indeed, the IP is gray, like 10.251.15.XXX. I got angry. I wrote to the provider in a support cart, to which they told me that they had nothing to do with it, it's all my router, he supposedly does NAT for the group. Sounds crazy.

How to act in such a situation? Where to dig?

Answer 1

The provider sucks. You were removed for nat.
Buy an external IP service and not everything will be “correct”

Answer 2

Where does your router get the IP address on the external interface from? Is it DHCP from the provider or something else? If "DHCP from the provider" - then "the router itself makes a NAT group " - this is a lie, a hubbub and a provocation (by the way, it is not clear what kind of "group" this is).
It is very important here - that in communicating with the provider, someone conducts a conversation in a qualified manner. The mention of the same "DHCP" is quite valuable, if it's really true.
In general, you need to look at the contract. Not the fact that the provider is obliged to give a "white IP-address".