unbound NXDOMAIN TTL shared between records

Patrik Lundin patrik at sigterm.se
Fri Aug 21 17:07:54 UTC 2015

On Fri, Aug 21, 2015 at 04:32:33PM +0100, Tony Finch wrote:
> RFC 2308 section 5
>    Like normal answers negative answers have a time to live (TTL).  As
>    there is no record in the answer section to which this TTL can be
>    applied, the TTL must be carried by another method.  This is done by
>    including the SOA record from the zone in the authority section of
>    the reply.  When the authoritative server creates this record its TTL
>    is taken from the minimum of the SOA.MINIMUM field and SOA's TTL.

Thanks for pointing that out, it explains the length of the initial TTL.

Patrik Lundin

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