What is DDNS?

If we wish to run a server for website hosting or accessing CCTV cameras, available from any Internet location - and we don't have a static IP address but a dynamic one supplied by DHCP server (e.g. ADSL service) - we have to use DDNS (Dynamic Domain Name System).

DDNS server provides a database containing relations between domain names and numeric addresses, which may be updated on request, by the domain owner. Thanks to this feature, the server is available in the domain name regardless its current IP address.

We have to remember that when DHCP server changes the IP, it takes some time to detect this change by the client software or router. Then, after the notification has been sent to DDNS server, it takes another minute or so to send this piece of data to DNS server to update the database. As a result, our server will be periodically unavailable up to several minutes - every time the IP address has been changed.

IP CCTV in fright forwarding company

Digital CCTV monitoring based on IP solutions becomes increasingly mainstream in video surveillance of buildings, parking lots, distribution centers etc. Not long ago the costs of professional IP CCTV monitoring systems were so high that they were mainly deployed in big cities. Recently the situation has changed significantly so that they may be used literally everywhere. IP CCTV systems ensure effective monitoring of geographically dispersed locations and building of installations with great number of cameras. They can be easily extended, reconfigured, and developed by software solutions. This cuts operational costs. Example of Spedkol company in Poland.