Birmingham mumbai

Setting up external DNS with bind
To set up your very own DNS server, we'll first 
need to install the 
Berkeley Internet 
Name Daemon
 (
BIND
) package on our server:
sudo apt install bind9
Now, we should have the 
bind9
 service running on our server, though it's not 
actually configured to do much at this point. The most basic function of 
bind
 is to 
act as what's called a 
Caching Name Server
, which means that the server doesn't 
actually match any names itself. Instead, it caches responses from an external server. 
We'll configure 
bind
 with actual hosts later, but setting up a caching name server is a 
good way to get started.
To do so, open the 
/etc/bind/named.conf.options
 file in your favorite text editor.
Within the file, you should see a block of text that looks similar to the following:
// forwarders { 
//      0.0.0.0; 
// }; 

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Setting Up Network Services