[afnog] Decreasing Access Time to Root Servers DNS by Running One on Loopback

[Frank Habicht]

Hi,

On 12/19/2015 10:11 PM, Nishal Goburdhan wrote:
> in a previous life, that's what i'd do to pre-populate dns caches at
> 5.27am daily.  no-one seemed to complain :-)

... and (most of) those didn't expire for a significant part of the day.
And I'd say that has changed. [1]

And you were a bit lucky if what you were querying wasn't already in the
cache and thus not updated. (TTL 25h ?)

Don't we all just want:
man unbound.conf:
 prefetch: <yes or no>
   If yes, message cache elements are prefetched before they expire to
   keep  the  cache  up  to  date.
   Default is no.  Turning it on gives about 10 percent more traffic
   and load on the machine, but popular items do not expire from the
   cache.


Frank

[1]
just to be more clear: TTLs changed. The ones part of DNS records.
ok more clear: the TTLs got shorter (lower numbers)
ok: not all, but many and many popular ones.