Dynamic dns

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(Dynamic DNS) A service that lets anyone on the mạng internet gain access khổng lồ resources on a local network when the internet address of that network is constantly changing. Such resources are typically a website server, Webcam or a PC for remote control operation.

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Cable and DSL providers frequently change the IP address of their customer"s service, which makes it impossible to lớn access the network from the outside world without knowing what the IP address is at any given moment. DDNS client software resides in a router, Webcam or PC. When it detects that the IP address of the cable or DSL modem has changed, it notifies the DDNS service provider of the new address. See dynamic IP address.

The DDNS Service Provider

The key element in this is the DDNS service provider, which hosts the DNS servers that become the authority for the domain name names. When the DNS server responds khổng lồ a request for the IP address of a domain name name, it returns the current address along with a time-to-live (TTL) of only a few minutes. By causing the address to expire in such a short time, it prevents the address from being cached throughout the Internet. See TTL.

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The DDNS provider generally offers a faster và more economical way to gain external access khổng lồ internal resources than by upgrading ISP service from dynamic addressing to lớn a static address. The largest DDNS provider is Dynamic Network Services, which acquired DDNS company Tzolkin Corporation in 2012 (www.dyn.com). See DDNS relay, DHCP, WINS & DNS.


For residential users of Foscam"s IP network cameras, the company offers its own DDNS service lớn allow remote access khổng lồ the camera. As in this example, a DDNS URL is assigned lớn a new user in case the internet provider changes the IP address.