Technical Tip: FortiDDNS priority of monitor interfaces

For example, customer would like to register abc.fortiddns.com to mutiple isp IP addresses configure on wan1 and wan2, when wan1 IP is down, wan2 IP is able to override and register as main IP address of abc.fortiddns.com.

# config system ddn
    edit 1
        set ddns-server FortiGuardDDNS
        set ddns-domain "abc.fortiddns.com"
        set monitor-interface "wan1" "wan2"
    end

But this configuration is not the best practice because FortiDDNS server has interval time to update the ip registration, and priority of the IP addresses cannot be configured in FortiDDNS , it is necessary to call Fortinet Technical Assistance Center to reset the registration for wan2 ip to override wan1 IP.

In other words, it is recommended to customer to use different domain for different isp links.