Can’t use IP DNS server as a fallbak about dnsecure HOT 3 OPEN

IP addresses on the servers section are tied to the DNS-over-TLS/HTTPS settings section's server name or URL. For example, to use Cloudflare's 1.1.1.1 as DoT, you must specify cloudflare-dns.com as the server name on the DNS-over-TLS settings section. So, you cannot use your customized DNS server and 1.1.1.1 at the same time.

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Is that mean the DoT/DoH hostname need to match the IP address? What if I use my own DoT? I need to also use my own DNS's IP for it?

I believe the failback should be another DNS, so for example if I use my own DoT, dns.example.com, I would like to have a failover DNS such as 1.1.1.1 so in case my DoT fail or for whatever reason not working, I still have fallback 1.1.1.1 to resolve domain without any issue. (Maybe a warning but not completely lost internet)

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Is that mean the DoT/DoH hostname need to match the IP address?

No. In case of DoT, it's a domain name of the certificate, and in case of DoH, it's an endpoint of DoH resolver.

For example, Cloudflare is using cloudflare-dns.com for their DoT's certificate as described here, and https://cloudflare-dns.com/dns-query as an endpoint of DoH as described here.

I believe the failback should be another DNS, so for example if I use my own DoT, dns.example.com, I would like to have a failover DNS such as 1.1.1.1 so in case my DoT fail or for whatever reason not working, I still have fallback 1.1.1.1 to resolve domain without any issue. (Maybe a warning but not completely lost internet)

I believe that iOS's NEDNSSettingsManager API doesn't support a fallback like that. If so, we can't do it. I'll read the documentation again.

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