Can bind be configured to not drop RR's from the cache when the upstream DNS server is unresponsive

[Ron]

On Fri, Mar 18, 2016 at 9:43 AM, Ron <ron.arts at gmail.com> wrote:
>
> How about a list of domains for which cached RRs will not be purged
> _unless_ a different RR is supplied by the 'upstream' server?
>

Or, with Barry Margolin's comments in mind, a dynamic list, which is
compiled from the domains that are accessed, say, at least once a day
(or some other configurable timeframe).

Ron