
Software User’s Manual Ver.A1D-502-V8.03.30-NB
39
After changing any of the items above, press Apply to save the changes. The Reset button
undoes the changes that had just been made but not applied yet.
5-5-3 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.
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