Hey
NAT isn’t the main problem. The main problem is, that the GL router isn’t able to see the public IP - because it’s behind another router. In that case, it does not know about the public IP and can’t update the DDNS.
Only ways to go:
- Removing the first router in front of the GL one or set it into bridge mode.
- Using another DDNS service from the first router or some device that offers a service like this
Being behind another router and using DDNS does not work with GL DDNS.