[Pdns-users] max-negative-ttl does not work

[Stefan Priebe - Profihost AG]

Hi Nico,

Am 09.01.19 um 09:33 schrieb Nico CARTRON:
> Hi Stefan,
> 
> On 09-Jan-2019 09:19 CET, <s.priebe at profihost.ag> wrote:
> 
>> Dear List,
>>
>> i'm trying to get max-negative-ttl to work but i can't.
>>
>> # dpkg -s pdns-recursor  | grep Version
>> Version: 4.1.8-1pdns.stretch
>>
>> # grep max-negative-ttl /etc/powerdns/recursor.conf
>> max-negative-ttl=30
>>
>> # dig -t A unknowndomainxyz.multi.hiddendomain.de
>> ...
>> ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 26437
>> ...
>>
>> dumped cache:
>>
>> # grep "unknowndomainxyz.multi.hiddendomain.de" /cachefile
>> unknowndomainxyz.multi.hiddendomain.de. 3588 A  ; tag 0
>>
>> Why is the TTL 3588 when max-negative-ttl is set to 30?
> 
> Just did a quick check on one of my Recursor, version 4.1.8 running on
> FreeBSD, and max-negative-ttl works as expected (i.e. if I set it to 30
> seconds, I correctly get this back, should it be with a dig or when
> dumping the cache).
> 
> Did you forget to restart the recursor after having changed the value in
> the recursor.conf? Cause the 3600 value is the default one.

No it was def. restarted after changing the config.

See below:
# rec_control get-parameter max-negative-ttl
max-negative-ttl="30"

Greets,
Stefan