I use Hikvision NVR's and just ran across this recently. You can get to the internal menu of your IP camera by doing this on a Hikvision NVR. I do not know about the Dahua NVR. This works for both my Hikvision and Dahua cameras.
Here is a link that shows you how to do it: Mast Digital | Trade Distributor of CCTV, Aerial & Satellite, AV equipment. How to access your IP cameras via your Hikvision NVR
Below are two screen shots from one of my Hikvision NVRs. By the way I love this feature. On the far right are the camera addresses that you click on.


Here is a link that shows you how to do it: Mast Digital | Trade Distributor of CCTV, Aerial & Satellite, AV equipment. How to access your IP cameras via your Hikvision NVR
Below are two screen shots from one of my Hikvision NVRs. By the way I love this feature. On the far right are the camera addresses that you click on.

