You are trying to change too many things, and your ipconfig screenshots with local IP addresses whited out shows you don't understand basic networking.
From your ipconfig screenshots, it looks like your PC has two Ethernet ports, and you are only using the Realtek port. You mentioned you have a switch, and the R8000 router. Is the 'switch' your POE switch that the cameras are plugged into? Is that the only thing plugged into the switch (cameras and BI PC)? If so, you should do the following instead:
Before doing step 5 below, you will need to login to each camera and set their IP to a static address in the 192.168.2.xxx range. Eg I have my cam1 as 192.168.2.101, cam2 as 192.168.2.102 etc
1. Remove the cable going from the POE switch to the router.
2. Plug the unused Intel port on the PC into the router.
3. Plug the Realtek port into the POE switch (which I think you currently have).
4. Leave the settings on the Intel ethernet adapter IPv4 properties to automatic (both IP and DNS to automatic)
5. Change the IP settings on the Realtek ethernet adapter IPv4 properties to a different subnet: IP: 192.168.2.1 Subnet mask: 255.255.255.0 Default gateway: blank (I think, I'll have to check my setup at home tonight). DNS empty
6. In your router, reserve the currently assigned IP address for your BI PC. This will be the one with MAC address C8-60-00-C6-74-1E if you correctly plugged the Intel port into the router.
If you have other things plugged into the POE switch, what are they? Do they need POE? If not, plug them into the router LAN ports instead.
Doing the above will achieve what you are looking for. It will both set your BI PC to static, and will completely isolate the cameras from the internet.