Remote Management issue

Shihab28 · July 20, 2020

So, recently I've been trying to use remote management on my Netgear WNR-614 router.
Now, before we get into this discussion, let me point out a few things.

Firstly,
My router currently has an internal IP of 192.168.1.1 (will refer to as T3IP)
Secondly, my ISP setup a static IP on my router, whiich is 172.16.x.x (will refer to as T2IP)

Thirdly, googling my IP address, and also using no-ip.com shows that my public IP is 118.179.x.x (will refer to this as T1IP)

Lastly, my router is set to a specific port Y for remote management and noip domain being z.ddns.net , which is also set for the Dynamic DNS Service in the router settings, and I also have an app in a PC that is always on to keep refreshing the IP for the DDNS service every 5 minutes.

I tried to access the router using T2IP:Y, but that only works inside the home wifi network, doesn't work with mobile data or VPN.
Tried T1IP:Y, doesn't work for both inside network or using mobile data or VPN.
Tried z.ddns.net:Y, doesn't work for both inside network or using mobile data or VPN.

Kind of confused on how to make remote management actually work, would really appreciate if someone could show me the ropes to be able to remotely manage my router.