ACTi I51 User Manual download pdf (Page 54)

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Firmware User’s Manual V6.08.30

DDNS

There are surveillance solutions that consist of single

cameras scattered over a wide territory, therefore each of those cameras should be connected to

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

1 2 ... 49 50 51 52 53 54 55 56 57 58 59 ... 118 119

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ACTi I51 User Manual Page 54