This maybe an older post but I have a similar DVR and also trying to set it up.
What is your IP scheme?
My suggestion is have NIC 1 with a static IP (10.x.x.x I think you said) connected to your Internet provider and have NIC 2 addressed like your cameras at 192.168.1.x. Connect Nic 2 to your POE switch and connect the cameras to it. No need to put a gateway
or DNS since NIC 2 and the cameras are on the same wire.
All traffic from the cameras will be isolated to that port which is a good thing but your
will need the DVR to access the video from them.