Hello. Have you considered trying to set the NVR to DHCP and then seeing if you can locate it by the MAC on the TP Link router device list?
Search results for "dahua"
MAC Vendor
E0508B Zhejiang Dahua Technology Co., Ltd.
9002A9 Zhejiang Dahua Technology Co., Ltd.
4C11BF Zhejiang Dahua Technology Co., Ltd.
3CEF8C Zhejiang Dahua Technology Co., Ltd.
14A78B Zhejiang Dahua Technology Co., Ltd.
About MAC address
MAC address - Media Access Control address. MAC addresses - hardware addresses that uniquely identifies each node of a network. It is assigned by the vendor or manufacturer and saved to the device memory.
According to the OSI model it is a second-level address. In IEEE 802 networks Data Link Control (DLC) layer is divided into two sub-layers: the Logical Link Control (LLC) layer and the Media Access Control (MAC) layer.
First 3 bytes (or 24 bits) of MAC addresses are known as the Organizationally Unique Identifier (OUI) and usually encodes the manufacturer.