If all upstream dns server fail, can dnsmasq uses the local stale cache?
Or if not, is there any dns cache server support this feature?
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https://serverfault.com/questions/817589/can-a-local-dns-cache-be-configured-to-use-stale-records-when-upstream-fails It looks like ubound dns can do that – Paul P Joby Sep 13 '22 at 16:20