Home IP CCTV Cameras Not Showing on Network

Hi – I have 3 x Uniview Dome cameras on the outside of my property hardwired via Cat5 back into a patch panel. The NVR they were connected too suffered a HDD failure. I’ve now replaced with a Synology 1218NVR which I’ve installed on the network successfully.

Although the 3 ports on my switch are showing a live connection for the 3 cameras, I cannot see them on the network via Advanced IP Scanner or via my router. I am therefore unable to complete installation of them onto the NVR.

Is there any advice you can offer as to how I go about getting the cameras visible on the network as I’m at a loss on next steps. They have all previously worked fine with no issue.

Thank you

Jim