Maintained by: NLnet Labs

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

W.C.A. Wijngaards
Tue Aug 21 08:58:52 CEST 2012


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Hi Mark,

In 1.4.17 there is a fix called:
Fix timeouts to keep track of query type, A, AAAA and other, if
another has caused timeout blacklist, different type can still probe.

It could likely prevent this issue.  You should not (with updated
unbound version) have this issue.  It should probe the nameserver.
You are forwarding, unbound basically talks to one upstream machine?

Best regards,
   Wouter

On 08/21/2012 08:09 AM, Mark Picone wrote:
> Hi All,
> 
> Continuing from:
> http://comments.gmane.org/gmane.network.dns.unbound.user/1976
> 
> Does anyone know if cause/fix for this behaviour was ever
> discovered?
> 
> I considered playing with the 'infra-host-ttl' setting but we have
> seen outages of 10 hours+ (with unbound returning NXDOMAIN for all
> forwarded queries until it is restarted) so I don't think lowering
> from the default of 900 seconds would help in our case.
> 
> I am fairly confident the problem is unbound related as we have
> BIND resolvers running side-by-side and they have not skipped a
> beat, over many years.
> 
> For now we'll be moving back to BIND (9.8.0b1+, which has the
> static-stub zone type we need) but I would like to try unbound
> again at some point in the future.
> 
> Nagios check graphs which show the resolvability of 'google.com': 
> http://www.deakin.edu.au/~markp/unbound/unbound_resolver1.png 
> http://www.deakin.edu.au/~markp/unbound/unbound_resolver2.png
> 
> 
> user at host:~ %cat /etc/redhat-release Red Hat Enterprise Linux
> Server release 6.2 (Santiago)
> 
> user at host:~ %uname -a Linux host 2.6.32-220.7.1.el6.x86_64 #1 SMP
> Fri Feb 10 15:22:22 EST 2012 x86_64 x86_64 x86_64 GNU/Linux
> 
> user at host:~ %rpm -qa | grep unbound unbound-1.4.14-1.el6.x86_64 
> unbound-libs-1.4.14-1.el6.x86_64
> 
> 
> Regards,
> 
> Mark Picone Unix Administrator
> 
> Deakin University Geelong Waterfront Campus 1 Gheringhap Street,
> Geelong, VIC 3220 Phone: +61 3 52278602 Deakin University CRICOS
> Provider Code 00113B
> 
> 
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> _______________________________________________ Unbound-users
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