Maintained by: NLnet Labs

[Unbound-users] Cannot resolve the MX for bk.bund.de using unbound

W.C.A. Wijngaards
Thu Dec 13 10:28:00 CET 2012


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Hi Ralf,

On 12/13/2012 10:12 AM, Ralf Hildebrandt wrote:
>>> Good question, works fine here ;-)
>> 
>> It looks like their RRSIGs got resigned today, so perhaps there
>> were expired or not-yet valid RRSIGs? Or a botched key rollover?
>> 
>> It seems to work fine now.
> 
> I'm still having problems:
> 
> root at mail2:~# dig @127.0.0.1 -t mx bk.bund.de
> 
> ; <<>> DiG 9.8.1-P1 <<>> @127.0.0.1 -t mx bk.bund.de ; (1 server
> found) ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<-
> opcode: QUERY, status: SERVFAIL, id: 48547 ;; flags: qr rd ra;
> QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0
> 
> ;; QUESTION SECTION: ;bk.bund.de. IN MX
> 
> ;; Query time: 25 msec ;; SERVER: 127.0.0.1#53(127.0.0.1) ;; WHEN:
> Thu Dec 13 10:12:01 2012 ;; MSG SIZE  rcvd: 28
> 
> How can I debug this further?

If you do dnssec validation, set the val-log-level: 2 in unbound.conf.
Then it prints detailed errors about what goes wrong (and reload or
restart unbound).

You can get diagnostics out of unbound-control.  With lookup bund.de
and dump_infra | grep <ip of bund.de nameservers that you saw in lookup>

If it still fails, increase the verbosity level to gain more information.

Best regards,
   Wouter


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