DDNS (Dynamic Domain Name System) on a router is a service that lets network clients connect to your router using a consistent domain name, even if your public IP address changes.
How DDNS Works
Normally, your internet service provider (ISP) assigns your router a public IP address. This address can change over time (hence "dynamic"). This creates a problem if you want to access your home network from outside. You can't always know the current IP address. DDNS solves this problem by:
- Linking a Domain Name to Your Changing IP: You register a domain name (like myhomenetwork.com) with a DDNS provider.
- Router Updates the DDNS Provider: Your router uses the DDNS service to update the provider with your current public IP address whenever it changes.
- Consistent Access: Instead of trying to remember a changing IP address, you use your domain name to reach your network. The DDNS provider directs traffic to your current IP.
Key Benefits
- Remote Access: Access your home network, servers, or security cameras from anywhere.
- Consistent Connection: No need to track changing IP addresses.
- Ease of Use: The router typically handles the DDNS updates automatically.
Example
Imagine you have a security camera at home. With a dynamic IP address, every time it changed, you would need to find out the new one to access your camera. DDNS solves this issue. Instead, you would access your camera using a domain name like myhomecamera.myddns.com without needing to update that URL ever.
DDNS Service Options
- Built-in Services: Many routers, like ASUS, have built-in DDNS services.
- Third-party Providers: Several companies offer DDNS services, giving you more flexibility.
Key Takeaway
DDNS is essential for maintaining remote access to your home network when your public IP address is dynamic. Your router becomes accessible through a fixed domain name.
