Maintained by: NLnet Labs

[Unbound-users] Unbound stops answering after ADSL-line bounce

W.C.A. Wijngaards
Fri Feb 10 15:34:05 CET 2012


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Hi Paul,

On 02/10/2012 02:28 PM, Paul Taylor wrote:
> On the original topic of this thread, I have another incident to report.
> After experiencing some strangeness with my NAS (where unbound was
> running previously), I moved Unbound to an installation of pfSense
> running on an old net4801.  I believe pfSense is still on version 1.4.14
> of Unbound.  I configured it pretty much identically to my NAS
> installation of Unbound.  By that, I mean that I have numerous
> forwarders added for various CDNs, with a "." forwarder pointing to
> OpenDNS.  DNSSEC validation is disabled.  About two weeks had passed
> with no further problems, until this morning. 
> 
> Just before I was about to leave home for work (just after 7 AM), my
> daughter told me that the internet was down.  I checked my router and
> saw that the internet connection went down last night for a little over
> an hour..  It recovered about 3:15 AM.  So, it had been up and
> operational for almost 4 hours by the time I started looking at the
> issue.  A quick nslookup showed SERVFAIL replies.  Since I had to leave
> for work, I didn't have time to do much in the way of troubleshooting.
> I recycled the service via pfSense's Services page (I think it just
> kills and restarts the service), and DNS was resolving properly again.

It should not be down for that long; 15 minutes really.

> Unfortunately, since it's on an embedded box, I didn't have logging
> enabled, and I don't know what commands, if any, I could run that let
> you see the "state" Unbound is stuck in when this happens.  

unbound-control verbosity 4  ; then nslookup and capture the logs (which
are then plentiful).

unbound-control dump_infra   > tofile.txt
that shows the state of the infrastructure cache.

Best regards,
   Wouter

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