How to close an open DNS resolver - Linux

How to close an open DNS resolver - Linux

Locate the BIND configuration file within the operating system. 

The BIND configuration file is usually located in one of the following paths:

 /etc/bind/named.conf 

/etc/named.conf 

Open the named.conf file in your preferred editor. 

Add the following details to the Options section: 

allow-transfer {"none";}; 

allow-recursion {"none";}; 

recursion no;

 Restart the service.