Own DNS Server
The own DNS server combines the Dyn DNS client.
Theory
The FlyingFish DNS server will never be an official root DNS server. He could only do that if the router or PC directly enters the IP from the DNS server. For example, the DHCP could distribute the DNS IP.
But here I will describe how the DNS server can officially manage a sub DNS server for online query subdomains.
If you have received your domain from the DNS administrator, you can manage the records yourself in the provider's portal.
Example if you own the example.com domain, you can manage the subdomains for this domain in FlyingFish, e.g. sub1.example.com.
A domain example.com gets an NS (name server) record from the provider. These records can only point to domain names. In addition, we create a subdomain dyn.example.com who's A record gets the IP from our DynDNS client/or fixed IP. DNS servers are backwards resolving. That means if a sub1.example.com is called but not found, example.com is called. However, this does not return an A record, only the NS record. Now the client knows he must request a DNS server under the domain dyn.example.com. With its IP resolution it gets the IP from the FlyingFish DNS server. Then the client asks this DNS server again and gets sub1.example.com an A record.
In the diagram you can see how the flow works:
The DynDNS client delivers the IP and writes it to dyn.example.com A Record.
The domain example.com points to an NS record on domain dyn.example.com.
The dyn.example.com record now sends the DNS client to our FlyingFish DNS server.
From now on we can manage all sub domains and example.com ourselves with our own records.
Practice
I myself use the provider "Selfhost" which I can recommend for this setup.
Test your DNS Server
First you should check whether the server is accessible in the network. According to the standard installation, the DNS port is 5333. This is simply specified in the app.
If everything is set up as above with the "NS" record and port forwarding from the router is set up, we can start the query without IP and port:
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