[dns-operations] More Aggressive prefetch for popular names
muks at mukund.org
Mon Apr 8 12:00:15 UTC 2019
On Mon, Apr 08, 2019 at 12:08:57PM +0100, Tony Finch wrote:
> Davey Song <songlinjian at gmail.com> wrote:
> > The recent event happened last week was a name of CCTV VOD services, people
> > call in complaining they can not open the video. It was found that in Gang
> > Zhou City, the DNS of a local broadband service provider served stale data
> > for that name for hours.
> It sounds to me like the problem was that the resolver had been configured
> with a large minimum TTL, which should be fixed by not misconfiguring the
> resolver in the first place.
The default in the case of BIND is 1 week for postive answers. It's not
uncapped and there are cases for which 1 week is suitable, but it may be
too long a wait for a zone editor who has made a mistake.
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