In short DDNS (Dynamic DNS) is an automatic service to help combat dynamic IP addresses when attempting to remotely connect to a system.
Dynamic IP addresses are as the name implies, IP addresses that are assigned to an internet connected router on a short term or temporary bases by your ISP.
As knowing the current IP address of the site you wish to connect to is a fundamental piece of information when trying to connect to a CCTV system or any system remotely, the fact the IP address could change at any time makes the system almost impossible to work with. Some IP address can change as often as 5 to 6 times a day.
To overcome this DDNS is used.
DDNS replaces the need to know a sites current IP address by replacing the IP address with a more commonly recognised and more memorable URL.
LILIN offer a free DDNS service for customers using LILIN equipment.
With some basic settings added to a LILIN device installed on the site you wish to remotely connect to, a free LILIN DDNS address is setup and automatically updated so any time the sites IP address changes this change is automatically detected and adjusts the destination IP address that your personal DDNS URL is directed to.
A guide to configuring and using your free LILIN DDNS account can be found here
Example of DDNS usage
As an example Manager1 wants to connect remotely to their office CCTV. The office doesn’t have a static IP address so it is using an automatically issued dynamic IP address. Manager1 finds out their sites current IP address and heads off home for the evening. By the time they get home their sites IP address may have already changed, so remote access to the CCTV system would not be possible.
If Manger1 had set up a free LILIN DDNS account the scenario would be entirely different:
Manger1 logs in to their L Series camera and follows the DDNS setup and configuration video here.
They set up the following free LILIN DDNS account:
Now, where ever Manger1 goes in the world as long as they remember their DDNS address, they will always be able to connect to the CCTV system, whatever IP address the site has.
This DDNS address can be used in Web Browsers and Mobile App's.
For more information on DDNS please check out the Wiki page here