how to configure SERVFAIL/weird answer caches

[George Thessalonikefs]

Hi Petr,

I believe you need to change the value of util/data/msgparse.h:NORR_TTL.
By default it caches the SERVFAILS that are generated from the iterator 
module because of upstream issues for 5 seconds.
Changing that to 86400 would have the effect you look after.

Best regards,
-- George

On 28/01/2022 13:48, Petr Špaček via Unbound-users wrote:
> 
> Hello,
> 
> could someone share details of how SERVFAIL cache works and how it can 
> be configured? Pointers to places in code where I can tweak constants 
> are also welcome.
> 
> Background:
> I'm trying to configure Unbound to cache everything for one day 
> (`cache-min-ttl: 86400`). The intent is to create a "snapshot" in 
> Unbound's cache, and then I plan to re-query that snapshot from another 
> piece of software repeatedly.
> 
> I cannot find anything about SERVFAIL cache in unbound.conf or at 
> https://unbound.docs.nlnetlabs.nl/en/latest/ .
> 
> My question can be generalized to "how do I make Unbound to cache 
> everything including broken answers for a specified period of time"?
> 
> Thank you!
>