Double Nat Issue With Fibre

Installing and Using OpenWrt Network and Wireless Configuration
1

So heres my proble guys i have a

huawei echolife hg8242h (ONT Device) fibre to wan coversion
then a Dlink DIR-1960 running OpenWRT for my (PPPoE) ISP settings.

I cant seem to open ports to alow plex port fowarding through as i seem to be stuck behind a double NAT. Ive tried port fortwarding with no sucess even tried putting my dlink on the same Ip Subnet/network address as the Huawei (192.168.100.1) Dlink (192.268.100.10) With DHCP set to 192.168.100.10-192.168.100.254) i have unPNP enabled firewalls off passthrough enabled DMZ enable to 192.168.100.1

Can Anyone offer some sugestions so i can get my plex server to be availible outside the network

2

It's the Huawei device you need to reconfigure 1st, if there are no firewall options in it, you're screwed, at least using ipv4.

3

If the PPPoE connection is being initiated by the OpenWrt router, then there is no double-NAT with the ONT. If the PPPoE connection does not give you a public IP address, then your ISP is using CGNAT, and there is nothing you can do locally.

EDIT: Fixed a typo... I should stop posting from my phone, if I am not wearing my glasses

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4

Does your ISP use carrier grade Nat (here in the UK many newer fibre providers do). if so you are stymied unless they will give you a static IP