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Closing Open DNS Servers

Posted by yolau

Allowing DNS Recursion is like running an Open SMTP Relay. You allow anyone to query your DNS server and this can easily lead to abuse.
You can fix this by disabling recursive lookups for not authorized IP’s.
This article will teach you step by step how to do this.

Login to your server as root
Edit /etc/named.conf
pico /etc/named.conf
Add before [...]