DynDNS
Expert function
For an Internet subscription without the option "Fixed IP address", the public WAN IP address is assigned dynamically via DHCP and may change periodically.
However, constant accessibility is required for access from the Internet to resources in the customer network (LAN). DynDNS provides a solution for this by making the network accessible via a fixed hostname – even if the IP address changes.
DynDNS is a service that allows linking a fixed domain address with a regularly changing IP address. This is particularly relevant for Internet connections where the IP address is not assigned statically but dynamically.
Goal and Purpose
To ensure that data in the customer network (LAN) remains accessible via the Internet if necessary, even if the WAN IP address changes.
Instructions
A selection of DynDNS providers can be found in the router menu Internet ➜ DynDNS.
- Set the slider "Activate DynDNS" to ON.
- Select the DynDNS provider where an account exists.
- Enter the subdomain or domain in the Hostname field.
- Enter the username and password of the personal DynDNS account.
- The entries are applied by clicking Save.
Conditions
- Router portal login credentials are known.
- The hostname is registered with the DynDNS service provider and access data is known.
FAQ - DynDNS
Why is DynDNS needed?
DynDNS is useful if access to devices in the company network (LAN) is required from the road via the Internet, even if the IP address changes frequently.
What needs to be configured if the IP address does not change?
With the "fixed IP address" option, the IP remains unchanged and DynDNS is necessary.
How does DynDNS work?
If the WAN IP address changes, the router notifies the configured DynDNS service and communicates the current IP address. The DynDNS service then updates the DNS records so that they point to the new IP address. This ensures continuous access to devices in the LAN.
Can a DynDNS provider be set up that is not predefined in the selection list?
With the option "Custom provider", any DynDNS provider can be set up.
How can risks associated with using DynDNS be mitigated?
- Configure strong credentials with the DynDNS service provider. The password must contain a combination of upper and lower case letters, numbers, and special characters and be at least 14 characters long.
- Use a secure https connection for communication with the DynDNS service.
- Restrict accessibility of the company network (LAN) from the outside. ACLs can be used to limit access via DynDNS to the LAN and services.
- Implement suitable security measures such as a firewall or VPN.
Is something missing here? Feedback is welcome! pilot@swisscom.com Please describe the area where content is expected or what could be improved.