How to setup DNS

1. install

   sudo apt-get install bind9
   sudo apt-get install dnsutils


2. configuration (caching name server or primary master or secondary master)

    a) Caching Nameserver 

      a.1) simply uncomment and Replace x.x.x.x with 
           the IP Adresses of your ISP's DNS servers

           sudo nano  /etc/bind/named.conf.options
      
           forwarders {
                    207.69.188.185;
                    207.69.188.187;
               };

          a.2) sudo /etc/init.d/bind9 restart
  
     
    b) Primary Master 

         b.1)  add a DNS zone to BIND9, turning BIND9 into a Primary Master server
 
                sudo nano /etc/bind/named.conf.local   

                zone "icc-computer.com" {
			type master;
        		file "/etc/bind/db.icc-computer.com";
		};

         b.2)  create the /etc/bind/db.icc-computer.com by an existing zone file as a template 
 
               sudo cp /etc/bind/db.local /etc/bind/db.icc-computer.com

         
         b.3)  Edit the new zone file as below 
               (Note: You must increment the Serial Number every time you make changes to the zone file.)

               sudo nano /etc/bind/db.icc-computer.com


; BIND data file for local loopback interface
;
$TTL    604800
@       IN      SOA     localhost. root.icc-computer.com. (
                              2         ; Serial
                         604800         ; Refresh
                          86400         ; Retry
                        2419200         ; Expire
                         604800 )       ; Negative Cache TTL
;
@       IN      NS      ns1.icc-computer.com.
@       IN      A       192.168.1.100
@       IN      AAAA    ::1
ns1     IN      A       192.168.1.100                 
ns2     IN      A       192.168.1.101
ubuntu9 	IN      A       192.168.1.100 
Server2003      IN      A       192.168.1.101
smtp    IN      A       192.168.1.100


           b.4) Edit Reverse Zone File      
      
 		 sudo nano /etc/bind/named.conf.local 

                 zone "1.168.192.in-addr.arpa" {
        		type master;
        		notify no;
        		file "/etc/bind/db.192";
		};



           b.5)  create the /etc/bind/db.192 file

                 sudo cp /etc/bind/db.127 /etc/bind/db.192



           b.7)  edit /etc/bind/db.192 (as below)

                 sudo nano /etc/bind/db.192

; BIND reverse data file for local loopback interface
;
$TTL    604800
@       IN      SOA     ns1.icc-computer.com. root.icc-computer.com. (
                              2         ; Serial
                         604800         ; Refresh
                          86400         ; Retry
                        2419200         ; Expire
                         604800 )       ; Negative Cache TTL
;
@       IN      NS      ns1.
100     IN      PTR     ns1.icc-computer.com.
@       IN      NS      ns2.
101     IN      PTR     ns2.icc-computer.com.
100     IN      PTR     ubuntu9.icc-computer.com.
101     IN      PTR     Server2003.icc-computer.com.
100     IN      PTR     smtp.icc-computer.com.


           b.8) sudo /etc/init.d/bind9 restart



    c) Secondary Master
       
          c.1)  Add the allow-transfer (as below)

             sudo nano /etc/bind/named.conf.local
             
zone "icc-computer.com" {
        type master;
        file "/etc/bind/db.icc-computer.com";
        allow-transfer { 192.168.1.101; };
};

zone "1.168.192.in-addr.arpa" {
        type master;
        notify no;
        file "/etc/bind/db.192";
        allow-transfer { 192.168.1.101; };
};






3. test

   dig -x 127.0.0.1
   dig ubuntu.com
   dig ubuntu.com    #again to see the Query time improvement 
   
   ping icc-computer.com
   
   named-checkzone icc-computer.com /etc/bind/db.icc-computer.com
   named-checkzone icc-computer.com /etc/bind/db.192