Manual

www.acti.com
Firmware User’s Manual V6.09.45
54
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