Help needed with failed queries - SERVFAIL

[Olaf Frączyk]

Hello,

One more thought - This behaviour didn't happen with bind 9.9 - on CentOS 7.

Best regards,

Olaf Frączyk

NAVI Sp. z o.o.
Promienista 5/1
60-288 Poznań

mobile: +48609769035
phone: +48616622881
fax: +48616622882
http://www.navi.pl

On 2020-10-04 01:39, Olaf Frączyk wrote:
> Hello,
>
> I'm running bind on CentOS 8:
>
> bind-9.11.13-6.el8_2.1.x86_64
>
> From time to time I get SERVFAIL responses.
>
> When the client queries second time, it gets the answer, so this are 
> transient errors. I don't see any pattern for them.
>
> This happens probably a few times a day - enough to make it annoying 
> in long term. The worst is on Windows clients, as they need to do 
> "ipconfig /flushdns".
>
> However I don't know the cause, running debug I got this:
>
> client @0x7fcb50128510 192.168.217.121#34656 (piekielni.pl): view 
> internaldns-view: query failed (SERVFAIL) for piekielni.pl/IN/A at 
> ../../../bin/named/query.c:9385
> client @0x7fcb50128510 192.168.217.121#34656 (piekielni.pl): view 
> internaldns-view: error
> client @0x7fcb50128510 192.168.217.121#34656 (piekielni.pl): view 
> internaldns-view: send
> client @0x7fcb50128510 192.168.217.121#34656 (piekielni.pl): view 
> internaldns-view: sendto
> client @0x7fcb50128510 192.168.217.121#34656 (piekielni.pl): view 
> internaldns-view: senddone
> client @0x7fcb50128510 192.168.217.121#34656 (piekielni.pl): view 
> internaldns-view: next
> client @0x7fcb50128510 192.168.217.121#34656 (piekielni.pl): view 
> internaldns-view: endrequest
> fetch completed at ../../../lib/dns/resolver.c:2870 for piekielni.pl/A 
> in 0.707553: failure/success 
> [domain:piekielni.pl,referral:2,restart:1,qrysent:0,timeout:0,lame
> :0,quota:0,neterr:0,badresp:0,adberr:0,findfail:2,valfail:0]
>
> Why qrysent is 0, but findfail 2?
>
> I'm not very familiar with the output, maybe someone could explain me 
> what is happening.
>
> Best regards,
>
> Olaf Frączyk
>
> -- 
> NAVI Sp. z o.o.
> Promienista 5/1
> 60-288 Poznań
>
> mobile: +48609769035
> phone: +48616622881
> fax: +48616622882
> http://www.navi.pl
>
> _______________________________________________
> Please visit https://lists.isc.org/mailman/listinfo/bind-users to 
> unsubscribe from this list
>
> ISC funds the development of this software with paid support 
> subscriptions. Contact us at https://www.isc.org/contact/ for more 
> information.
>
>
> bind-users mailing list
> bind-users at lists.isc.org
> https://lists.isc.org/mailman/listinfo/bind-users