TP Link Router - Inbound access with DDNS with Private IP?

Question

I was going thru the knowledge base/FAQs on TP Link Routers about Dynamic DNS here.

I am a bit confused about the 3rd point in the Notes written therein.

Notes:

1. Make sure you have internet when you’re registering a TP-LINK domain name.
2. If you fail to register a TP-LINK domain name, it means your domain name has been registered by others. Please try to change another hostname.
3. Your domain name will be bound to the external public IP address of your network. So don’t worry if the ISP assigns a private WAN IP address (such as 192.168.1.x) to the router.
4. If you want to change the domain name, just click Unbind and Delete your current domain name. Then tap Register to bind a new one.

The question is why shouldn't I be worried if the ISP assigns Private IP to my router, when I want to establish an Inbound connection? In that case even if router has Private IP, for an inbound connection, who/what will ensure routing from the ISP's device that has routable Public IP to my router that now has a private IP?

Does the TP Link router establish some sort of outbound connection to the DDNS service? I am under the impression that seamless Remote Wake-On-LAN or remote access to your home network device (from the Internet) is possible when ISP assigns a Public IP to your Router (And of course required port forwarding is set up in Router config wherever needed). If your router has a private IP it gets complicated I suppose.

Thanks.

Answer 1

I made some researches on the web, and I found that almost every manual states that if the ISP assigns you a private WAN address (and if so, you are likely under a multi layer NAT), the DDNS service doesn't work. TL-MR6400, TD-W9960, Archer C1200 are all TP-Link models. Even the Archer C8 manual states that the service doesn't work in such condition, which is contradictory because here it is said quite the opposite. I cannot tell, I know that there are some workarounds and somebody managed to have a DDNS working in some strange cases (this seems to work for some people, but it's a very specific solution), but in such an uncertain condition, I would definitely open a ticket asking for clarifications.