Step 1 : configuration > Management > Dyndns > Add > Enable services
Step 2: Select provider there was multiple provide also available
Step 3: Method it will reach the communicate the DynDNS provider in this USE WEB or Default route interface IP
Step 4: Mention the Dyndns server IP where u host and enter the credentials
Step 5: In Dyn, record name mention the create the DNS name for reach the server