The NVR & the cameras are configured in 192.168.1.0 IP network by default. If your home WiFi router is in a different IP subnet, you'll not be able to get the system work properly. Depending on the system you have, you may not be able to watch the video locally or remotely on goolink app on your phone. In some cases, you'll be able to watch the videos on monitor connected to the NVR, but the video cannot be watched on your laptop or phone. This tutorial shows you how to change the IP Address of your NVR & cameras.