QNAP VS-2004L en - Manual (Page 249)

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Environment 3: The NVR and the IP camera are all located remotely
IP address
NVR 219.87.144.205
Camera 1 61.62.100.101
Camera 2 61.62.100.102
Camera 3 61.62.100.103
In this example, add the IP camera to the NVR by adding its IP address to the ‘IP Address’
settings.
Note: If a particular port is assigned to connect to the IP camera, specify the port in the
system configuration.