Dynamic DNS (DDNS) maps the dynamic IP address of a user to a fixed domain name service. Each time the user connects to the network, the DDNS client synchronizes the dynamic IP address of the user's host to the DDNS server located on the service provider host, where the DDNS server is responsible for providing DNS services and dynamically resolving domain names. When Athena NGFW serves as the DDNS client, it dynamically updates the mappings between its domain names and IPv4 addresses on the DNS server via the DDNS service provider, to ensure that the domain names can be correctly resolved to the corresponding IPv4 addresses.

To add a DDNS policy, go to Network > DNS > DDNS > DDNS Policy, and click Add. In the dialog box that appears, configure parameters as required, and click OK, as shown in the following figure.

• Name: Specify the name to uniquely identify the DDNS policy.

• Status: Select whether to enable or disable the DDNS policy.

• Description: Enter a description for the DDNS policy.

• Provider: Select the DDNS service provider, such as DynDNS, No-IP, Zoneedit, easyDNS, and DynAccess.

• Domain: Enter the domain name that needs to be updated.

• Username: Enter the username that is registered with the DDNS service provider.

• Password: Enter the password corresponding to the username that the DDNS client uses to access the DDNS service provider.

• Interface: Select one or more interfaces with which the DDNS policy is associated. All Layer-3 interfaces are supported, including physical routing interfaces, Layer-3 subinterfaces, VLAN interfaces, and Layer-3 aggregate interfaces.

• Update Interval: Specify the interval at which the update is triggered. The default interval is 24 hours.

• Retry Interval: Specify the time after which a retry will be initiated upon a failure. The default retry interval is 10 minutes.

The following figure shows the newly added DDNS policy.

The DDNS Provider tab displays the supported DDNS service providers.