I have a HikVision 7608 NI-E2/8P/A
I'm trying to access the cams individually from my LAN (192.168.1.*), but its not possible because all cams are on the NVR's internal interface (192.168.254.*)
I believe the Virtual host option is for this very purpose.
It would allow me to add a static route, and then the NVR will forward packets from my LAN to the camera, so I could access them directly via IP in a browser, or via ssh etc
Sadly my NVR firmware doesn't offer the Virtual Host option, so I'm jealous
If Ive understood it correctly its a very useful option to have