Hi Aaron, On 01/11/2022 23:03, Aaron de Bruyn via dnsdist wrote:
Is there a way to specifically respond to cached items and return SERVFAIL if it's not in the cache?
I'm afraid there is no way to do exactly that. I guess we would need a selector with the ability to look into the packet-cache (so you could use RCodeAction only if the entry is not there) or a chain of rules that is executed after the packet-cache lookup.
But if I understand correctly what you are looking for, setServFailWhenNoServer(true) [1] should do what you want:
- look into the packet cache and return the result on a hit - forward the query to an available server in the selected pool, if any- return a ServFail response if there is no available server in the selected pool
[1]: https://dnsdist.org/guides/serverselection.html?#setServFailWhenNoServer
-- Remi Gacogne PowerDNS.COM BV - https://www.powerdns.com/
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