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Disable Open DNS Recursion
The DNS recursion mean the DNS will not query any other DNS server apart from its own cache within its local DNS server.
By disabling recursion in DNS, your local DNS server might not resolve queries send to the external websites.
First, open this file:
sudo vim /etc/bind/named.conf.options
Then add these options:
version "Not Disclosed";
Restart BIND DNS server
sudo service bind9 restart