Maintained by: NLnet Labs

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

Felix Schueren
Mon Aug 31 13:56:58 CEST 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.
> 
Yes.

> 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

-- 
Felix Schüren
Head of Network

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