Manual

www.acti.com
Firmware User’s Manual V6.09.45
53
DDNS
There are surveillance solutions that consist of single
cameras scattered over a wide territory, therefore each of those cameras should be connected to
the Internet in order to become accessible by Control Center. For example, the chain stores, bus
stops, currency exchange booths, etc.
In such cases, one of the practical networking solutions is to use DSL modem on camera site and
let the camera obtain the dynamic IP address from the Internet Service Provider through the DSL
modem using PPPoE connection, which is much more cost-effective than applying for static IP
address.
However, there is one drawback in this solution – in order to do the remote surveillance from the
Control Center, the NVR Server in the Control Center has to know the address of the IP camera
at all times in order to get the video stream from the camera. If the camera’s network connection
has been reset for any reason, the camera will get a new IP address through DSL Modem, which
may be different from the previous one. NVR will not know about this change, and the connection
between the camera and NVR will fail.
There however exists a solution that makes sure the NVR can find the camera even if the camera
IP changes frequently. Our cameras support Dynamic DNS or DDNS service that allows
frequently changing IP be mapped to a certain unchangeable domain name. The mapping
database and its updating engine are hosted in one of the Dynamic DNS servers, most of which
offer basic services for free, such as www.dyndns.org.
How does it work? Look at the graph below.
Internet
Control Center
(NVR)
IP Camera
DSL Modem
PPPoE Connection with Dynamic IP address
Video Stream from camera to NVR
Commands from NVR to camera’s IP address