Advidia "A" Series Manual do Utilizador descarregar pdf (Página 45)

Firmware User Manual

Every time the IP camera gets an IP that is different from previous one, it notifies the public DDNS Service

about the change. The DDNS Service updates its database immediately, mapping the assigned domain

name (for example camera123.dyndns.org) to the new IP address. In NVR settings, only the domain

name (camera123.dyndns.org) is used to identify the camera. When the NVR needs to connect to the

camera, it requests the camera’s current IP address from the DDNS Service. The DDNS Service instantly

responds to NVR and tells it the camera’s IP. Now the NVR will use the IP of the camera to connect to the

camera and the video stream from the camera to NVR can be initiated.

As a result, the NVR can always find the IP camera in the event that the IP address is changed on the

camera. Since there are so many public DDNS Services available for free, the PPPoE-based connection is

really a good and low-cost solution for single-camera sites.

Internet

Control Center

(NVR)

IP Camera

DSL Modem

Using Dynamic DNS

DDNS Service

Camera notifies DDNS service when IP changed

NVR uses camera’s domain name to ask DDNS

DDNS tells the NVR what the camera’s IP is

Commands from NVR to camera’s IP address

Video Stream from camera to NVR

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Advidia "A" Series Manual do Utilizador Página 45