After a few days having the zmodo nvr on the network, everything stopped working. The network froze. After some wireshark captures I found that the NVR was broadcasting a DHCP discovery every two seconds. (Even when a static IP was set for all cameras and the device). The only way around this at the moment was to put the nvr on its own network with some routing between them. I’m waiting for some feedback from zmodo in regards to the issue.