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