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dnsdist: Don't cache answers without any TTL #4987

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@rgacogne
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@rgacogne rgacogne commented Feb 8, 2017

Short description

RFC2308 states that:

negative responses without SOA records SHOULD NOT be cached as there is no way to prevent the negative responses looping forever between a pair of servers even with a short TTL".

Fixes #4983.

Checklist

I have:

  • read the CONTRIBUTING.md document
  • compiled and tested this code
  • included documentation (including possible behaviour changes)
  • documented the code
  • added regression tests
  • added unit tests
`RFC2308` states that "negative responses without SOA records SHOULD
NOT be cached as there is no way to prevent the negative responses
looping forever between a pair of servers even with a short TTL".
@ahupowerdns ahupowerdns merged commit cab90c2 into PowerDNS:master Feb 9, 2017
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@rgacogne rgacogne deleted the rgacogne:dnsdist-prevent-caching-no-ttl branch Feb 9, 2017
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