RFC 8767 recheck timer

George Thessalonikefs george at nlnetlabs.nl
Tue Jul 21 12:56:45 UTC 2020

Hi Andreas,

This timer is not specifically created for the serve-stale functionality
because as is mentioned in the following paragraph of the RFC:
> Most recursive resolvers already have the query resolution timer and,
> effectively, some kind of failure recheck timer.

This is also true in unbound, where failure recheck measures were
already in place, though not configurable (at least in the sense of a

Best regards,
-- George

On 21/07/2020 14:30, Andreas Schwarz via Unbound-users wrote:
> Hi,
> I am currently testing the RFC 8767 related options in unbound to serve stale records.
> RFC 8767 mentions in section 5
>  >  *  A failure recheck timer, which limits the frequency at which a
>  >    failed lookup will be attempted again.
> I could not find any option related to this functionality in the unbound manual. All the other portions of the RFC seem to be covered, but not this one. Did I miss something or is this not implemented?
> Cheers
> Andreas

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