[Unbound-users] forward servers: option to log failed requests

Felix Schueren felix.schueren at hosteurope.de
Mon Aug 31 11:56:58 UTC 2009

W.C.A. Wijngaards wrote:
> Hi Felix,
> On 08/31/2009 10:22 AM, Felix Schueren wrote:
>> we're still tracking a "some miniscule amount of queries fail every
>> couple of days" case with unbound, and we think it might be related to
>> unbounds backoff timer. Dumping unbound-control lookup (forwarded-zone)
>> every minute yielded this:
> These servers are both for the same zone, right?
> So if server 1 does not work, unbound tries server 2.
> In the sample below, it would start out favoring server 2,
> which is working fine it says.

> Are there statistics from the kernel, network stack, about
> packets and dropped packets?  Is the answer getting dropped
> somewhere else in your network?
I don't see anything out of the ordinary, 30s-averages don't show
anything exceeding 5% interface bandwidth on the path between unbound &
the forward servers. That still means that there could be very short
bursts causing packets to be dropped, however, monitoring latency, it
does not look likely.

Kind regards,


Felix Schüren
Head of Network

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