Am 20.09.2016 um 00:12 schrieb Pol Hallen:
In the third case, the A records had expired from the cache (since the
TTL on those records is 300 seconds = 5 minutes), so your resolver
needed to fetch a fresh set from the yahoo.it nameservers -- the NS
records of which were most likely cached from the first lookup -- but
it didn't need to follow the referral chain all of the way down from
the root. 19 msec.
thanks Kevin, now it's clear
is there a way to keep update cache of queries users will do?
not sure hwat you mean but likely
https://kb.isc.org/article/AA-01315/0/prefetch-performance-in-BIND-9.10.html
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