Difference between revisions of "Setting up unbound DNS server"

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= Further information =
= Further information =
[http://linux.die.net/man/5/unbound.conf unbound.conf man page]
unbound.conf man page [http://linux.die.net/man/5/unbound.conf unbound.conf here] or [http://unbound.net/documentation/unbound.conf.html here]
[http://unbound.net/documentation/howto_optimise.html unbound optimization guide]
[http://unbound.net/documentation/howto_optimise.html unbound optimization guide]

Revision as of 08:01, 12 November 2013

Unbound is a validating, recursive, and caching DNS resolver that supports DNSSEC.


Install the unbound package:

apk add unbound


The following configuration is an example of a caching name server (in a production server, it's recommended to adjust the access-control parameter to limit access to your network). The forward-zone(s) section will forward all DNS queries to the specified servers.

  • /etc/unbound/unbound.conf
        verbosity: 1
## Specify the interface address to listen on:
## To listen on all interfaces use the following line instead
#       interface:
        do-ip4: yes
        do-ip6: no
        do-udp: yes
        do-tcp: yes
        do-daemonize: yes
        access-control: allow
## Other access control examples
#access-control: action
## 'action' should be replaced by any one of:
#deny (drop message)
#refuse (sends  a  DNS  rcode REFUSED error message back)
#allow (recursive ok)
#allow_snoop (recursive and nonrecursive ok).
## Minimum lifetime of cache entries in seconds.  Default is 0.
#cache-min-ttl: 60
## Maximum lifetime of cached entries. Default is 86400 seconds (1  day).
#cache-max-ttl: 172800
        control-enable: no
##enable to not answer id.server and hostname.bind queries. 
        hide-identity: yes
##enable to not answer version.server and version.bind queries. 
        hide-version: yes
## Note for forward zones, the destination servers must be able to handle recursion to other DNS server
## Forward all *.example.com queries to the server at
#        name: "example.com"
#        forward-addr:
## Forward all other queries to the Verizon DNS servers
        name: "."
## Level3 Verizon

Set auto-start, start and test the daemon

Set to auto-start then start unbound:

rc-update add unbound rc-service unbound start

Test, for example:

dig nl.alpinelinux.org @


nslookup www.google.cz @

or use drill, which requires the drill package:

drill www.bbc.co.uk @

Further information

unbound.conf man page unbound.conf here or here

unbound optimization guide

excellent unbound tutorial at calomel.org

General information via the Wikipedia pages on DNS, record types, zones, name servers and DNSsec