Maintained by: NLnet Labs

[Unbound-users] Maximum TTL for negative cache

Tomas Hozza
Fri Jun 12 11:56:14 CEST 2015

On 09.06.2015 18:22, Paul Wouters wrote:
> On Tue, 9 Jun 2015, Yuri Schaeffer wrote:
> >> Is it really not possible to set negative cache maximum TTL?
> >
> > I've done some digging in the code and believe cache-max-ttl is
> > applicable to negative answers as well.
> But that's not very useful.
> The use case here is for instance when you're hotspotted and you will
> get a bunch of false answers or DNS queries fail. You really want to
> forget these practically instantly. But we don't want the real cache's
> TTLs reduced to instantly, as that would uhm, remove the entire cache.
> We can call it a bug instead of a feature if that makes Wouter happier :)
> Paul
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Yesterday I noticed that the maximum negative cache ttl is already in the upstream repo,
added on 29.5... So problem solved. ;)

Tomas Hozza
Software Engineer - EMEA ENG Developer Experience

Red Hat Inc.