Dahua DH-XVR54 L-I2 Series User Manual page 285

Enable the PPPoE function.
In the Username box and Password box, enter the username and password accordingly
provided by the Internet Service Provider.
Click Apply to complete the settings.
The system pops up a message to indicate the successfully saved. The IP address appears on
the PPPoE page. You can use this IP address to access the Device.
When the PPPoE function is enabled, the IP address on the TCP/IP page cannot be modified.
5.15.1.6 Configuring DDNS Settings
When the IP address of the Device changes frequently, the DDNS function can dynamically refresh the
correspondence between the domain on DNS and the IP address, ensuring you access the Device by
using the domain.
Preparation
Confirm if the Device supports the DDNS Type and log in the website provided by the DDNS service
provider to register the information such as domain from PC located in the WAN.
After you have registered and logged in the DDNS website successfully, you can view the information
of all the connected devices under this username.
PPPoE
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User's Manual