DNS (Domain name system).

10.    cd /var/named/
11.    cp named.localhost forward.zone
12.    cp named.loopback reverse.zone
13.   change below entries in forward.zone file

@ IN SOA kalwa2.home.com. root.kalwa2.home.com. (

   IN NS kalwa2.home.com.
   Kalwa2 IN A 192.168.216.131
   e.g. [root@kalwa2 named]# cat forward.zone
   $TTL 1D
   @ IN SOA kalwa2.home.com. root.kalwa2.home.com. (
   0 ; serial
   1D ; refresh
   1H ; retry
   1W ; expire
   3H ) ; minimum
          IN NS kalwa2.home.com.
   kalwa2 IN A 192.168.216.131
14.    Change below entries in reverse.zone file
    @ IN SOA kalwa2.home.com. root.kalwa2.home.com. (
        IN NS kalwa2.home.com.
    131 IN PTR kalwa2.home.com.
e.g.
    [root@kalwa2 named]# cat reverse.zone
    $TTL 1D
    @ IN SOA kalwa2.home.com. root.kalwa2.home.com. (
        0 ; serial
       1D ; refresh
       1H ; retry
       1W ; expire
       3H ) ; minimum
       IN NS kalwa2.home.com.
   131 IN PTR kalwa2.home.com.