Does open sense query the configured DNS servers in parallel and return the 1st retrieved answer?
It appears to me the built-in client queries the servers one at a time, in order. That is, I just get one request, to the primary. (I didn't try setting a fake one to test failover.) The behavior may be configurable... but I prefer the default.
How do you know that you get one request?
When I enter dns1, dns2, and dns3 where their response times are 100ms, 50ms, and 25ms, I get results in 25ms. This is only possible if the request is parallel or some logic tests them and prefers the fastest.
Quote from: Jyling on August 23, 2025, 05:41:24 PMHow do you know that you get one request? [...]
Firewall logs (I have logging enabled on all filters). In this case, the "let out anything from firewall host itself" rule.
It is absolutely inexplicable how the resolution occurs quicker than the response time of the 1st, slow server. This does not make any sense.
Is it possible that whichever DNS service you are using goes out and queries the upstream providers, finds the fastest, and uses that one first for all future requests?
I do not see mine querying multiple servers either, but it does sometimes show switching between the two upstream servers.
Not using the same name for testing.
Were the results cached, the response time would have been lower than the quickest, 3d server, but it is always equal to it.