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Diagram.
In the FortiGate GUI, go to Network -> DNS -> Enable FortiGuard DDNS, select the interface with the dynamic connection, select the server that is linked to the account, and enter 'Unique Location'.
From CLI:
config system ddns
edit 101
set ddns-server FortiGuardDDNS
set ddns-domain "fgtbacoor.fortiddns.com"
set use-public-ip enable
set monitor-interface "wan1"
next
end
Try to NSLOOKUP the fgtbacoor.fortiddns.com, and it will be resolved to whatever public IP the FortiGate is getting translated into.
After configuring, if the DDNS is not working, take the debug commands output below and open a TAC ticket, and update the debug output for TAC investigation.
diagnose debug disable
diagnose debug reset
diagnose debug app ddnscd -1
diagnose debug enable
To stop the debug processes in the end, press Ctrl + C and enter 'diagnose debug disable'.
Note:
- DDNS can only be configured via CLI for FortiGate VMs. Configuring DDNS via GUI is not supported for FortiGate-1000 series or higher or FortiGate-VM.
- Configuring DDNS via GUI is not supported when the configured DNS server is not using FortiGuard Servers. FortiGate does not support DDNS when in transparent mode.
- By default, one DDNS can be configured through the GUI. If it is necessary to configure multiple DDNS, configure them through the CLI.
- The 'use-public-ip' option is only available when 'ddns-server' is set to 'FortiGuardDDNS'.
- When configuring a FortiGuardDDNS domain in a High Availability (HA) cluster, the same entry is valid for both devices. When a failover event occurs, the ddnscd daemon will communicate with FortiGuard and trigger a removal request of the entry from the primary Serial Number, to the secondary (new primary) Serial Number.
- If it's necessary to delete a FortiGuardDDNS entry, due to a migration for a new device, raise a TAC Ticket with the Serial Number of the device that currently holds the DNS Records. This ticket will have to be created from the account that owns the FortiGate Appliance.
- If after creating all the configurations and with a nslookup the FQDN shows the Public IP of the ISP but there is still no communication to services and also the setup of a VPN (SSL - IPSec) do not come up or using a sniffer there is no traffic catch by the FortiGate coming from the WAN (or the upstream device giving Internet), keep in mind that the Public IP is still manage by the ISP (Internet Service Provider), check if there is any block o port forwarding need it on the router managing the Public IP address in order to all the queries be properly forwarded to the FortiGate.
Related documents:
FortiGate Admin Guide on DDNS
Troubleshooting Tip: Unable to access the FortiGate due to a DDNS issue on FortiGate
Technical Tip: FortiDDNS registration on another device using same FQDN
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