unbound needs to have cache-max-negative-ttl parameter for adjustment of the maximum TTL specifically for caching negative DNS responses

Solution Unverified - Updated -

Issue

  • unbound doesn't have cache-max-negative-ttl parameter, and the maximum TTL specifically for caching negative DNS responses can not be adjusted.
  • Previously, this limit was determined by the domain SOA record, or it was automatically the same as the maximum TTL limit for caching all DNS responses, if configured.

Environment

Red Hat Enterprise Linux 7

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