Access over External IP

Hi guys, I have an IP cctv which I’m trying to configure for external access.

I can connect to the system over its LAN IP (192.168.0.3) and while I am not connect to the LAN I can connect to it over its WAN IP.

What I want to do is be able to connect to the system via its WAN while I am connected to LAN. The reason for this is I have to have the system set up twice in its app.

I believe what I am trying to do is configure a hairpin NAT. Apologies, I’m not too savvy with these kind of things.

I hope this makes sense and someone can help 😃