Q-See QC40198 - Manual (Page 106)

WEB OPERATION
QC40198 User Manual
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Please refer to the following chart for detailed information.
Parameter Function
Server Type You can select DDNS protocol from the dropdown list and then
enable DDNS function. The private DDNS protocol means you
use your self-defined private protocol to activate DDNS function.
Server IP DDNS server IP address
Server Port DDNS server port.
Domain Name Your self-defined domain name.
User The user name you input to log in the DDNS server.
Password The password you input to log in the DDNS server.
Interval  Device sends out a live signal to the server regularly.
 You can set interval value between the device and DDNS
server here.
NAS
NAS interface is shown in Figure 7-41.
Figure 7-41