Purpose of multiple DNS per gateway
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Hello,
What is the purpose of multiple DNS per gateway in General section? im using the DNS resolver in forwarding mode. I observed requests are sent to every configured item, regardless if a previous one already resolved the query. This is also true for sequential option. I just dont understand
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In case one DNS server fails there is a 2nd to try. If you are using 8.8.8.8, 1.1.1.1 or your FW there is no real point.
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Thats what is expected yes but I see different behavior like described
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The way MS describes it: Windows will ask the primary DNS, if a response is not seen in a short time it asks the 2nd and so on. The DNS that responds first becomes the primary.
If you are looking a packet capture you should see some amount of time, my guess is 10's of ms, between the queries. MS never defined a "short time" when I asked about it.
However it is said to work, it seems most OSs do what you describe, hit several before the first DNS responds. The packets are small enough I don't think the developers care and are more worried about response time.
