DDNS defined

DDNS (Dynamic DNS) is a mechanism that automatically updates DNS records. When a device's public IP changes (such as a home broadband reboot, mobile base-station handover, or DHCP lease expiry), the DDNS client reports the new IP to the DNS server and points the domain (such as myserver.ddns.net) at the new address.

How DDNS works

The DDNS workflow:

  • Device obtains a dynamic public IP via DHCP (e.g. 203.0.113.45)
  • The DDNS client detects the IP change
  • The client calls the DDNS provider API to update the DNS record
  • The DNS server re-resolves the domain to the new IP
  • Users access the device through a fixed domain without caring about its actual IP

Use Cases

DDNS is indispensable in the following scenarios:

  • Remote site monitoring: distributed cell towers, stores, and factories with dynamic IPs use DDNS as a unified access entry point
  • Home/SOHO: ISPs don't provide a fixed public IP — DDNS makes remote access to NAS and cameras possible
  • VPN access: clients with dynamic IPs register with a VPN gateway to establish secure tunnels
  • IoT device management: many distributed IoT devices register with the cloud via DDNS for remote management
Key Point

CloudSino DCOS has a built-in DDNS client — remote-site devices auto-register with the CloudSino DNS, letting operations teams access thousands of edge nodes across the country through fixed domain names, without maintaining IP lists.

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DCOS