[Pdns-users] pdns-recursur 4.4: host unknown after some time with no clear reason

frank+pdns at tembo.be frank+pdns at tembo.be
Wed Jun 8 07:57:36 UTC 2022


Best of luck with your optimisations. If the network-slow are very slow, then this could explain the issue you see. 


> On 7 Jun 2022, at 15:34, Jan Huijsmans via Pdns-users <pdns-users at mailman.powerdns.com> wrote:
> Hi Frank,
> On Wed, 1 Jun 2022 12:48:01 +0200
> "frank+pdns at tembo.be" <frank+pdns at tembo.be> wrote:
>> Hi Jan,
>> I completely understand NDAs and myself (and numerous other PowerDNS
>> Certified Consultants on this list) are happy to sign them, as part
>> of a professional engagement. Please reach out to me off-list to
>> discuss your options.
>> However, this also means that on this list, we can't help you much...
>> As per your questions: first we need to know what happens. The trace
>> should tell us. Options to look at: (yes this list is long and some
>> won't apply, but please reread the first sentence of this mail)
>> * https://doc.powerdns.com/recursor/settings.html#network-timeout
> I'm getting the feeling this is the culprit. We looked at the nsspeeds
> the recursor reported and saw times between 0.6 and 1.2s for the
> root servers just after a restart of de recursor.
> I now get reports that the admins see 2s responce times in their
> environment, making the default of 1.5s timeout a tad close to the
> times observed in a clean environment and to low for reported times.
> We instructed to set the network-timeout to 3000 or even 5000.
>> *
>> https://doc.powerdns.com/recursor/settings.html#dont-throttle-netmasks
> We already set this to,::/0 and kept seeing the issues.
> The local admins are keeping an eye on the environment with the new
> settings and will report back.
> -- 
> Jan Huijsmans              bofh at koffie.nu
> ... cannot activate /dev/brain, no response from main coffee server
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