I am new to linux. plz help me to sort out the problem. Recently i have installed centos 6. now i want to configure dns. but its not resolving correctly.

[root@anu ~]# rpm -qa | grep bind
bind-9.7.3-8.P3.el6_2.1.i686
rpcbind-0.2.0-8.el6.i686
samba-winbind-clients-3.5.4-68.el6.i686
ypbind-1.20.4-29.el6.i686
bind-devel-9.7.3-8.P3.el6_2.1.i686
bind-utils-9.7.3-8.P3.el6_2.1.i686
bind-libs-9.7.3-8.P3.el6_2.1.i686
bind-sdb-9.7.3-8.P3.el6_2.1.i686
bind-dyndb-ldap-0.2.0-7.el6.i686
PackageKit-device-rebind-0.5.8-13.el6.i686
bind-chroot-9.7.3-8.P3.el6_2.1.i686

[root@anu~]#vim /var/named/chroot/etc/named.conf
//
// named.conf
//
// Provided by Red Hat bind package to configure the ISC BIND named(8) DNS
// server as a caching only nameserver (as a localhost DNS resolver only).
//
// See /usr/share/doc/bind*/sample/ for example named configuration files.
//

options {
listen-on port 53 { 127.0.0.1; 192.168.1.2; };
listen-on-v6 port 53 { ::1; };
directory "/var/named";
dump-file "/var/named/data/cache_dump.db";
statistics-file "/var/named/data/named_stats.txt";
memstatistics-file "/var/named/data/named_mem_stats.txt";
allow-query { localhost; };
recursion yes;

dnssec-enable yes;
dnssec-validation yes;
dnssec-lookaside auto;

/* Path to ISC DLV key */
bindkeys-file "/etc/named.iscdlv.key";
};

logging {
channel default_debug {
file "data/named.run";
severity dynamic;
};
};

zone "." IN {
type hint;
file "named.ca";
};

include "/etc/named.rfc1912.zones";

[root@anu~]#vim /var/named/chroot/etc/named.rfc1912.zones

// named.rfc1912.zones:
//
// Provided by Red Hat caching-nameserver package
//
// ISC BIND named zone configuration for zones recommended by
// RFC 1912 section 4.1 : localhost TLDs and address zones
// and http://www.ietf.org/internet-drafts/...l-zones-02.txt
// (c)2007 R W Franks
//
// See /usr/share/doc/bind*/sample/ for example named configuration files.
//

zone "localhost.localdomain" IN {
type master;
file "named.localhost";
allow-update { none; };
};

zone "localhost" IN {
type master;
file "named.localhost";
allow-update { none; };
};

zone "anu.com" IN {
type master;
file "anu.localhost";
allow-update { none; };
};


zone "1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa" IN {
type master;
file "named.loopback";
allow-update { none; };
};

zone "1.0.0.127.in-addr.arpa" IN {
type master;
file "named.loopback";
allow-update { none; };
};

zone "2.1.168.192.in-addr.arpa" IN {
type master;
file "anur.loopback";
allow-update { none; };
};

zone "0.in-addr.arpa" IN {
type master;
file "named.empty";
allow-update { none; };
};




[root@anu]# vim /var/named/chroot/var/named/anu.localhost

$TTL 1D
@ IN SOA @ anu.com. (
0 ; serial
1D ; refresh
1H ; retry
1W ; expire
3H ) ; minimum
NS @
IN NS anu.com.
A 127.0.0.1
anu IN A 192.168.1.2
AAAA ::1

[root@anu]# vim /var/named/chroot/var/named/anur.loopback

$TTL 1D
@ IN SOA @ anu.com. (
0 ; serial
1D ; refresh
1H ; retry
1W ; expire
3H ) ; minimum
NS @
A 127.0.0.1
anu.com. IN A 192.168.1.2
AAAA ::1
PTR localhost.
2 IN PTR anu.com.


[root@anu ~]# service named restart
Stopping named: . [ OK ]
Starting named: [ OK ]


[root@anu ~]# nslookup anu.com
Server: 192.168.1.1
Address: 192.168.1.1#53

Non-authoritative answer:
Name: anu.com
Address: 74.xx.xx.xx
Name: anu.com
Address: 216.xxx.xxx.xxx

[root@anu ~]# nslookup 192.168.1.2
Server: 192.168.1.1
Address: 192.168.1.1#53

** server can't find 2.1.168.192.in-addr.arpa.: NXDOMAIN


What should i do now??? Plz help me...

You need to configure a reverse lookup zone in your DNS server: http://search.yahoo.com/search?p=%2B...UTF-8&fr=moz35

For

nslookup anu.com

What is the IP of your system? Can you do nslookup like this?

i have tried that also.

[root@anu ~]# nslookup anu.com 192.168.1.2

Server: 192.168.1.2
Address: 192.168.1.2#53

** server can't find anu.com: NXDOMAIN

follow the changes in RED colour
and don't forget to change the serial key when you make changes in any of your zone files

make sure in your resolv.conf you mention this ip i.e 192.168.1.2

try this command and post the output