How to configure DDNS to pierce NAT?

Question

Computer networks

I have:
Internet - Modem - Wafer-router - Laptop (by waffle)
The laptop is in the router as a DMZ so that there are no problems
In the modem I set up DDNS from No-IP, forwarded port 8080 to the router
If you enter nc -l 8080 in one console and in another nc [my_host] 8080 it works, messages from one can be seen in the other. Ping works the same way. But from another host (even from another country), neither ping nor no-cat does not work.
The problem is that the modem gives the service an IP that is between the locale and the Internet, in the range 100.65.*.* and, accordingly, works only from my own host, or at least to other users of this provider (did not test it).
As I understand Host Type: DNS Host (A)it seems not that it is necessary, although it partially works
. I also have access to a VPS, on which you can open as many ports as you like. I know that you can somehow make a tunnel through ssh and achieve a similar result. How? This will be an "emergency"

Answer 1

How much understood - it is a question of NAT at provider. Then the answer is no. As an option - such providers usually sell static static separately (May come out cheaper and less hemorrhoids than with a tunnel through a VPS)
There are many options here: port forwarding via ssh, VPN tunnel and Port Forwarding on VPS, VPN to VPS and proxying on VPS.
But all these options are more complicated than buying white static from a provider and will require additional support.