ACTi I51 User Manual download pdf (Page 55)

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Firmware User’s Manual V6.08.30

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. Every

time when NVR needs to connect to the camera, it asks from DDNS Service what the current

camera’s IP is. The DDNS Service instantly responds to NVR and tells it the camera’s IP. Now

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, NVR can always find the IP camera regardless of frequently changing IP address of

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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ACTi I51 User Manual Page 55