Okay, let's do this again.
1st router will be RUTX11.
2nd router will be NetGear.
First of all, it would be best if you could reset both routers, so no additional configurations won't get in our way.
1st router (RUTX11) configuration:
- Set it's LAN IP to 192.168.1.1
- Configure Dynamic DNS again.
- Check if you get your Dynamic Public IP.
- Go to Administration > Access Control and enable Remote HTTP access.
2nd router (NetGear) configuration.
- Set it's LAN IP to 192.168.2.1.
- Go to Administration > Access Control and enable Remote HTTP access.
Connect 1st router to LAN, and 2nd router to WAN. 1st router will give out DHCP address to the second router, e.g 192.168.1.154.
On the first router do a port forward with source zone as WAN, external IP as Any, external port something like 8081, internal zone choose Lan, and internal IP as the IP address that your 1st router gave to the second, 192.168.1.154, and internal port 80.
Save everything and you should be able to reach your second router through dynamic public IP address, and if you set-up your dynamic dns, it should also work just fine.
EB.