unbound NXDOMAIN TTL shared between records
Tony Finch
dot at dotat.at
Fri Aug 21 15:32:33 UTC 2015
Patrik Lundin via Unbound-users <unbound-users at unbound.net> wrote:
>
> The first lookup (which also suspiciously seems to use the SOA TTL of 7200
> rather than the NXDOMAIN TTL of 18000):
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.
Tony.
--
f.anthony.n.finch <dot at dotat.at> http://dotat.at/
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