unbound without internet

Hans Sandsdalen hans at spacetec.no
Tue Sep 5 05:46:53 UTC 2023


Yesteday we lost connection to internet. I supposed that dns would be ok for our internal hosts. But unbound became very slow, sometimes did not respond at all. We use nsd and unbound. 

What can I do to prevent this in the future? 

/etc/unbound/unbound.conf.d/ contains tree files: 
KSPT.conf qname-minimisation.conf root-auto-trust-anchor-file.conf 


verbosity: 1 
access-control: allow 
access-control: allow 
access-control: allow 
port: 53 
do-ip4: yes 
do-ip6: no 
root-hints: "/etc/unbound/root.hints" 
cache-min-ttl: 300 
cache-max-ttl: 86400 
prefetch: yes 
num-threads: 1 
minimal-responses: yes 
prefetch: no 
do-not-query-localhost: no 
local-zone: "domain.no" nodefault 
local-zone: "168.192.in-addr.arpa" nodefault 
local-zone: "10.in-addr.arpa" nodefault 
domain-insecure: "domain.no" 
domain-insecure: "168.192.in-addr.arpa" 
domain-insecure: "10.in-addr.arpa" 
private-domain: "domain.no" 
name: "168.192.in-addr.arpa." 
stub-addr: at 1053 
name: "10.in-addr.arpa." 
stub-addr: at 1053 
name: "spacetec.no" 
stub-addr: at 1053 

control-enable: yes 


# Send minimum amount of information to upstream servers to enhance 
# privacy. Only sends minimum required labels of the QNAME and sets 
# QTYPE to NS when possible. 

# See RFC 7816 "DNS Query Name Minimisation to Improve Privacy" for 
# details. 

qname-minimisation: yes 


# The following line will configure unbound to perform cryptographic 
# DNSSEC validation using the root trust anchor. 
auto-trust-anchor-file: "/var/lib/unbound/root.key" 

Manager IT Tromsø 
Space Ground Systems 
Kongsberg Defence & Aerospace AS 

+47 977 62 632 
[ mailto:hans at spacetec.no | hans at spacetec.no ] 
[ http://www.kongsberg.com/space | www.kongsberg.com/space ] 

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