This howto shows the steps needed to configure unbound for DNS caching and forwarding from the 192.168.1.0\/24 network. It assumes the server\u2019s IP address is 192.168.1.22 and is running RHEL\/CentOS 7.<\/p>\n
Installation
\n[root@rhce-server ~]# yum install unbound<\/p>\n
Configure Systemd
\n[root@rhce-server ~]# systemctl enable unbound
\nln -s ‘\/usr\/lib\/systemd\/system\/unbound.service’ ‘\/etc\/systemd\/system\/multi-user.target.wants\/unbound.service’
\n[root@rhce-server ~]# ^enable^start
\nsystemctl start unbound<\/p>\n
Configure the Firewall
\n[root@rhce-server ~]# firewall-cmd –add-service=dns
\nsuccess
\n[root@rhce-server ~]# firewall-cmd –add-service=dns –permanent
\nsuccess<\/p>\n
Configure Unbound<\/p>\n
Unbound\u2019s configuration is stored in \/etc\/unbound\/unbound.conf.<\/p>\n
By default unbound only listens on the loopback interface. Specify which interface you would like to use.
\ninterface: 192.168.1.22<\/p>\n
Allow queries from 192.168.1.0\/24.
\naccess-control: 192.168.1.0\/24 allow<\/p>\n
Disable DNSSEC.
\ndomain-insecure: *<\/p>\n
Forward uncached requests to OpenDNS.
\nforward-zone:
\nname: *
\nforward-addr: 208.67.222.222
\nforward-addr: 208.67.220.220<\/p>\n
Check Your Configuration
\n[root@rhce-server ~]# unbound-checkconf
\nunbound-checkconf: no errors in \/etc\/unbound\/unbound.conf<\/p>\n
Restart the Unbound Service
\n[root@rhce-server ~]# systemctl restart unbound<\/p>\n
Verify it is Working<\/p>\n
Test from a different system on the network.
\nmooose:~ jglemza$ dig rmohan.com A @192.168.1.22<\/p>\n
; <<>> DiG 9.8.3-P1 <<>> rmohan.com A @192.168.1.22
\n;; global options: +cmd
\n;; Got answer:
\n;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 60299
\n;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0<\/p>\n
;; QUESTION SECTION:
\n;rmohan.com.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 IN\u00a0 A<\/p>\n
;; ANSWER SECTION:
\nrmohan.com.\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 43200\u00a0\u00a0 IN\u00a0 A\u00a0\u00a0 64.191.171.200<\/p>\n
;; Query time: 234 msec
\n;; SERVER: 192.168.1.22#53(192.168.1.22)
\n;; WHEN: Sat Mar 21 13:16:54 2015
\n;; MSG SIZE\u00a0 rcvd: 42<\/p>\n
Verify the record is now in unbound\u2019s cache.
\n[root@rhce-server ~]# unbound-control dump_cache|grep rmohan.com
\nns2.rmohan.com.\u00a0\u00a0 43197\u00a0\u00a0 IN\u00a0 A\u00a0\u00a0 23.253.56.58
\nrmohan.com.\u00a0\u00a0 43197\u00a0\u00a0 IN\u00a0 A\u00a0\u00a0 64.191.171.200
\nns1.rmohan.com.\u00a0\u00a0 43197\u00a0\u00a0 IN\u00a0 A\u00a0\u00a0 64.191.171.194
\nrmohan.com.\u00a0\u00a0 43197\u00a0\u00a0 IN\u00a0 NS\u00a0 ns1.rmohan.com.
\nrmohan.com.\u00a0\u00a0 43197\u00a0\u00a0 IN\u00a0 NS\u00a0 ns2.rmohan.com.
\n…<\/p>\n","protected":false},"excerpt":{"rendered":"
This howto shows the steps needed to configure unbound for DNS caching and forwarding from the 192.168.1.0\/24 network. It assumes the server\u2019s IP address is 192.168.1.22 and is running RHEL\/CentOS 7.<\/p>\n
Installation [root@rhce-server ~]# yum install unbound<\/p>\n
Configure Systemd [root@rhce-server ~]# systemctl enable unbound ln -s ‘\/usr\/lib\/systemd\/system\/unbound.service’ ‘\/etc\/systemd\/system\/multi-user.target.wants\/unbound.service’ [root@rhce-server ~]# ^enable^start systemctl start unbound<\/p>\n
Configure […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[50],"tags":[],"_links":{"self":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/5626"}],"collection":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=5626"}],"version-history":[{"count":1,"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/5626\/revisions"}],"predecessor-version":[{"id":5627,"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/5626\/revisions\/5627"}],"wp:attachment":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5626"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5626"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5626"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}