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2.2. Caching Nameserver
The default configuration is setup to act as a caching server. All that is required is simply adding the IP Addresses of your ISP's DNS servers. Simply uncomment and edit the following in /etc/bind/ named.conf.options:
forwarders {
};
1.2.3.4;
5.6.7.8;
Replace 1.2.3.4 and 5.6.7.8 with the IP Adresses of actual nameservers.
Now restart the DNS server, to enable the new configuration. From a terminal prompt:
sudo systemctl restart bind9.service
See Section 3.1.2, “dig” [p. 174] for information on testing a caching DNS server.