Maintained by: NLnet Labs

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

Mark Picone
Tue Aug 21 08:09:09 CEST 2012

Hi All,

Continuing from:

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 '':

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


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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