Overview
Readers will learn how to configure Dynamic DNS on the EdgeRouter using a custom service. See our Built-in Dynamic DNS article for more information on how to use the built-in services.
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NOTES & REQUIREMENTS:
Applicable to the latest EdgeOS firmware on all EdgeRouter models. Please see the Related Articles below for more information.
Device used in this article:
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Configuring a Custom Dynamic DNS Service
In this example, the Cloudflare Dynamic DNS service is used.
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CLI: Access the Command Line Interface. You can do this using the CLI button in the GUI or by using a program such as PuTTY.
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1. Enter configuration mode.
configure
2. Configure the dynamic DNS hostname.
set service dns dynamic interface eth0 service custom-cloudflare host-name <subdomain.domain.com>
3. Define the dynamic DNS credentials.
set service dns dynamic interface eth0 service custom-cloudflare login <user@domain.com>
set service dns dynamic interface eth0 service custom-cloudflare password <cloudflare-api-key>
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NOTE: The Cloudflare API key is used as the password. This key can be found in your Cloudflare profile.
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4. Define the dynamic DNS protocol.
set service dns dynamic interface eth0 service custom-cloudflare protocol cloudflare
5. Specify a domain name for the Cloudflare zone.
set service dns dynamic interface eth0 service custom-cloudflare options zone=domain.com
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NOTE: If a subdomain is set, it must also exist in the Cloudflare portal. The command above will only update an existing domain.
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6. Commit the changes and save the configuration.
commit ; save
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ATTENTION: On older firmware versions (pre v1.10.5), or for some providers (e.g. Google Domains), it is also needed to specify the remote server address using the command below.
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7. 
Specify the remote server.
set service dns dynamic interface eth0 service custom-cloudflare server www.cloudflare.com
You can verify the status and force an update of the Dynamic DNS service using the commands below:
show dns dynamic status
update dns dynamic interface <interface-name>
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NOTE: It may take some time for the servers to update and resolve the hostname to the correct address.
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Related Articles
EdgeRouter - Built-in Dynamic DNS
Intro to Networking - How to Establish a Connection Using SSH