How common is it for authoritative DNS servers to not respond to queries for zones they are not authoritative for (instead of returning REFUSED)?
I wish .is would change practices, if they haven't since. Blackholing is still safer IMO.
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R53’s shuffle sharding NS records mean that unreachability caching only targets the affected zone. On the common shared NS services it risks broader impact to other customers/zones
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A REFUSED should make resolvers retry with a different NS a lot faster than no response, and avoid them marking your server as broken for EDNS etc - see also https://tools.ietf.org/html/draft-ietf-dnsop-no-response-issue …
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