Birmingham mumbai

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Uncomment these lines. The 
forward slashes
 are comment marks as far as this 
configuration file is concerned, so remove them. Then, we can add a few external 
DNS server IP addresses. For these, you can use the IP addresses for your 
Internet 
Service Provider
 (
ISP
)'s DNS servers, or you could simply use Google's DNS 
servers (
8.8.8.8
 and 
8.8.4.4
) instead:
forwarders { 
  8.8.8.8; 
  8.8.4.4; 
}; 
After you save the file, restart the
 
bind9
 service:
sudo systemctl restart bind9 
To be sure that everything is running smoothly, check the status of the service:
systemctl status bind9 
It should report that it's 
active (running)
. As long as you've entered everything 
correctly, you should now have a working DNS server. Of course, we haven't added 
any DNS names for it to resolve, but we'll get to that. Now, all you should need to 
do is configure other devices on your network to use your new DNS server. The 
easiest way to do this is to reconfigure the 
isc-dhcp-server
 service we set up in the 
previous section. Remember the section that designates a pool of addresses from 
the server to the clients? It also contained a section to declare the DNS server your 
clients will use as well. Here's that section again, with the relevant line in bold:
subnet 192.168.1.0 netmask 255.255.255.0 { 
  range 192.168.1.100 192.168.1.240; 
  option routers 192.168.1.1;