Maintained by: NLnet Labs

[Unbound-users] Unbound and Timeouts

W.C.A. Wijngaards
Fri Aug 28 10:16:33 CEST 2009


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On 08/27/2009 07:35 PM, Gareth Hopkins wrote:
> Hi Again :)
> 
> So I have been testing unbound quite extensively over the past couple of
> days and am really liking it.
> 
> I have a question though, regarding timeouts.

> According to dig +trace, most of the errors are Bad Referrals. An
> example being

> How many Bad referrals need to be received before being classed as a
> SERVFAIL and how long
> will the query be worked on until it times out ?

You seem to have a busy server.  Therefore at any moment it will
be waiting for something.  These bad referrals may be causing the
most load on the server.

If the target gives bad referrals, another nameserver will be tried, and
if all nameservers give bad referrals, unbound tries a couple times and
then give up.  Should be very quick (depending on the RTT to those servers).

Timeouts depend on the RTT to the servers.

Best regards,
   Wouter
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