Every day millions of devices depend on MintDNS for all of their Dynamic DNS needs. It is also the engine powering many of the world's busiest dynamic DNS servers. NET dynamic DNS server application written in a combination of C++ and C#. The MintDNS Dynamic DNS Server Application If you would like more information, you can view Wikipedia's definition. DDNS works much like an old style phone operator by directing internet users to an appropriate internet connectedĭevice, despite the fact that the devices number may be constantly changing. If you needed to connect to aĭevice over the internet, you would have no way of knowing itsĬurrent number. Most IP addresses are subject to change or dynamic, and having aĭynamic IP can be a lot like having to change your phone DynDNS can circumvent the need for a dedicated or static IP address. The DNS makes using TCP/IP-based applications much more friendly, by routing users to specific network locations by name rather than by number.ĭynamic DNS, DDNS or DynDNS is a method of automatically updating a DNS server in real time when a devices IP address changes. To know whether you're using private IP or not, you should logon admin page of router, check Internet connection status, if it shows you a private IP address, it means you're using private IP address.The Domain Name System (DNS) provides the mechanism for translating internet domain names into numeric Internet Protocol (IP) addresses. Residential users normally can not use DDNS service unless they make a request for switching private IP to public IP. China Telecom, the state-owed ISP, it provides private IP address to residential users. many Chinese users can not use DDNS due to this reason. Using private IP address means your IP cameras/DVRs/NVRs are not accessible by Internet users. Private IP addresses can only be reached within a closed network and are not directly accessible from the outer Internet. A private IP address is, in contrast to a public IP address, not allocated to a specific organization, but can be used by anyone without approval from a regional Internet registry. Some Internet Service Providers (ISP) provide private IP address for Internet service. Private IP addressĭue to fact that public IP addresses (IPv4) are not adequate to the growing number of Internet users. If the port number is blocked, you should change port numbers in both your devices and port forwarding rules in router. 80 is the default port number for web service, it could be easily attacked by DDOS or hacking. There are many reasons why ISP decides to block certain port numbers, the most common one is 80. According to my existing knowledge and experience, the problem comes from two aspects port is blocked by ISP (internet service provider), your ISP provides a private IP address.

'Yes, all steps are correct, account info and port numbers are correct, but I can't access it remotely.' If you can locally access but fail to access it remotely. To debug the problem, foremost we need to ensure the account info and port numbers are correct. #2 Reasons why DDNS doesn't workĪlthough you followed instructions carefully to set DDNS, your devices still might not be accessible. Input DDNS information in your device (IPC, DVR, NVR), saving the settings and reboot your device. Read the manual or go to device's network setting webpage to know what DDNS service providers your device can support, then register an account Step 2 - Portt forwarding in the routerĭoing port forwarding for your devices in the router, the port number is the number which you locally access camera via web browser, or protocol's port number for video streams. Typically it only requires three simple steps to set DDNS successfully. You can do port forwarding to specific ports and create specific firewall rules to protect your cameras from possible authorized accessing. Users can set DDNS manually for their IP cameras, DVRs, NVRs. P2P makes connection super easy, but lacking flexibility and controlling. P2P servers maybe not in your country, the connection response time is slow.Most P2P services are free, it may become out of service when time goes by. P2P require remote servers to get involved.Users have no control on P2P connection, it performs automatically.Conventional IP cameras don't support P2P connection, but most of them support DDNS.#1 Reasons why people use DDNS rather than P2P Currently, there are two methods to achieve remote connection P2P (also called plug&play, a network protocol can automatically punch holes on firewall of router), and DDNS. No matter we are using IP cameras, DVRs, or NVRs, we want to remotely access them via different devices.

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