Connecting to 2nvrs together through port forwarding on separate networks

[Leju723]

I have two dahua nvrs both connected on separate networks with different routers. the 1st nvr is an 8channel nvr and the 2nd is a 128 channel nvr. I would like to view the cameras on the 1st nvr on the 2nd nvr. I have tried port forwarding through the HTTP port though it wasn't successful. They are connected to different networks, and they are in different locations. I have been reading about VLANs. Is that something I could maybe be able to use to achieve this

 

[TonyR]

You don't mention where these 2 routers are physically located...are they at different locations and each NVR has separate Internet access?
Or are they at the same physical location?

 

[Leju723]

You don't mention where these 2 routers are physically located...are they at different locations and each NVR has separate Internet access?
Or are they at the same physical location?

they are connected on diferent routers and they are in different locations

 

[steve1225]

they are connected on diferent routers and they are in different locations

the most secure solution is using some proper PRO routers (like something from unifi catalog UniFi Cloud Gateways - Ubiquiti) and create peer-2-peer VPN between two sites..

if this is not possible, then you must enable access to port 37777 from smaller NVR to bigger one...
you can do by port forwarding port 37777 from 8ch NVR on router and then putting public_ip_address (or ddns host) of that router in camera list of bigger NVR..

beware there a tons of malware which scans all public IPs for open ports..
and they detects that open port is Dahua camera/NVR and try to access it using all know exploits / popular passwords etc..

so first solution with PRO routers with cloud/peer-2-peer VPN functionality is much more secure..