Hello Guy's

I'm able to nslookup hostname but not able to nslookup IP.

Please help.

Thanks.

[root@alpha ~]# vi /var/named/chroot/etc/named.conf
[root@alpha ~]# service named restart
Stopping named: [ OK ]
Starting named: [ OK ]
[root@alpha ~]# nslookup alpha
Server: 172.168.190.101
Address: 172.168.190.101#53

Name: alpha.server.com
Address: 172.168.190.101

[root@alpha ~]# nslookup alpha.server.com
Server: 172.168.190.101
Address: 172.168.190.101#53

Name: alpha.server.com
Address: 172.168.190.101

[root@alpha ~]# nslookup crsprod-scan
Server: 172.168.190.101
Address: 172.168.190.101#53

Name: crsprod-scan.server.com
Address: 172.168.190.110
Name: crsprod-scan.server.com
Address: 172.168.190.120
Name: crsprod-scan.server.com
Address: 172.168.190.130

[root@alpha ~]# nslookup 172.168.190.101
Server: 172.168.190.101
Address: 172.168.190.101#53

** server can't find 101.190.168.172.in-addr.arpa.: NXDOMAIN

*******************************************************************



[root@alpha ~]# cat /var/named/chroot/etc/named.conf
options
{
directory "/var/named";
listen-on port 53 { any; };
};
zone "server.com"
{
type master;
file "server.com.fwd.zone";
};
zone "localhost"
{
type master;
file "localhost.fwd.zone";
};
zone "190.168.172.in-addr.arpa"
{
type master;
file "172.168.190.rev.zone";
};
zone "0.0.127.in-addr.arpa"
{
type master;
file "localhost.rev.zone";
};

zone "." in {
type hint;
file "/dev/null";
};

[root@alpha ~]#
[root@alpha ~]#
[root@alpha ~]#
[root@alpha ~]# cat /var/named/chroot/var/named/server.com.fwd.zone
$TTL 1D
@ IN SOA alpha.server.com. root.localhost (
2011071500 ; serial
8H ; refresh
4H ; retry
1W ; expiry
1D ) ; minimum
@ IN NS alpha.server.com.
localhost IN A 127.0.0.1
alpha IN A 172.168.190.101
beta IN A 172.168.190.102
alpha-vip IN A 172.168.190.103
beta-vip IN A 172.168.190.104
crsprod-scan IN A 172.168.190.110
IN A 172.168.190.120
IN A 172.168.190.130
[root@alpha ~]#
[root@alpha ~]#
[root@alpha ~]#
[root@alpha ~]#
[root@alpha ~]#
[root@alpha ~]# cat /var/named/chroot/var/named/172.168.190.rev.zone
$TTL 1D
@ IN SOA alpha.server.com. root.localhost. (
2011071500 ; serial
8H ; refresh
4H ; retry
1W ; expiry
1D ) ; minimum
@ IN NS alpha.server.com.
1 IN PTR alpha.server.com.
2 IN PTR beta.server.com.
3 IN PTR alpha-vip.server.com.
4 IN PTR beta-vip.server.com.
[root@alpha ~]#
[root@alpha ~]#
[root@alpha ~]#
[root@alpha ~]#
[root@alpha ~]#
[root@alpha ~]# cat /var/named/chroot/var/named/localhost.fwd.zone
$TTL 1D
@ IN SOA @ root (
2011071500 ; serial
8H ; refresh
4H ; retry
1W ; expiry
1D ) ; minimum
IN NS @
IN A 127.0.0.1

[root@alpha ~]#
[root@alpha ~]#
[root@alpha ~]#
[root@alpha ~]# cat /var/named/chroot/var/named/localhost.rev.zone
$TTL 1D
@ IN SOA localhost. root.localhost. (
2011071500 ; serial
8H ; refresh
4H ; retry
1W ; expiry
1D ) ; minimum
IN NS localhost.
1 IN PTR localhost.
[root@alpha ~]#
[root@alpha ~]#
[root@alpha ~]#
[root@alpha ~]# cat /etc/resolv.conf
search server.com
nameserver 172.168.190.101
nameserver 172.168.190.102
options attempts: 3
options timeout: 3

[root@alpha ~]#
[root@alpha ~]#
[root@alpha ~]#

There is no PTR record for 172.168.190.101, so you get the expected result.
Add:
increase the serial, reload zone and you'll be ok.

OMG bathory I don't have any words for you.I'm really speechless.Thank you so much.

Could you please explain me in detail ?

Please suggest some links related to my problem I really want to learn in depth.

Thanks.

[root@beta ~]# cat /var/named/chroot/var/named/172.168.190.rev.zone
$TTL 1D
@ IN SOA beta.server.com. root.localhost. (
2011071500 ; serial
8H ; refresh
4H ; retry
1W ; expiry
1D ) ; minimum
@ IN NS beta.server.com.
1 IN PTR alpha.server.com.
2 IN PTR beta.server.com.
3 IN PTR alpha-vip.server.com.
4 IN PTR beta-vip.server.com.
101 IN PTR beta.server.com.


[root@beta ~]# service named restart
Stopping named: [ OK ]
Starting named: [ OK ]
[root@beta ~]# nslookup 172.168.190.102
Server: 172.168.190.102
Address: 172.168.190.102#53

** server can't find 102.190.168.172.in-addr.arpa.: NXDOMAIN

Hello dear

Now able to nslookup with self node IP but not able to nslookup another node IP

[root@beta ~]# cat /var/named/chroot/var/named/172.168.190.rev.zone
$TTL 1D
@ IN SOA beta.server.com. root.localhost. (
2011071500 ; serial
8H ; refresh
4H ; retry
1W ; expiry
1D ) ; minimum
@ IN NS beta.server.com.
1 IN PTR alpha.server.com.
2 IN PTR beta.server.com.
3 IN PTR alpha-vip.server.com.
4 IN PTR beta-vip.server.com.
102 IN PTR beta.server.com.
[root@beta ~]# nslookup 172.168.190.102
Server: 172.168.190.102
Address: 172.168.190.102#53

102.190.168.172.in-addr.arpa name = beta.server.com.

[root@beta ~]# nslookup 172.168.190.101
Server: 172.168.190.102
Address: 172.168.190.102#53

** server can't find 101.190.168.172.in-addr.arpa.: NXDOMAIN

[root@beta ~]#

**************************************************************************************************** ***********************


[root@alpha ~]# cat /var/named/chroot/var/named/172.168.190.rev.zone
$TTL 1D
@ IN SOA alpha.server.com. root.localhost. (
2011071500 ; serial
8H ; refresh
4H ; retry
1W ; expiry
1D ) ; minimum
@ IN NS alpha.server.com.
1 IN PTR alpha.server.com.
2 IN PTR beta.server.com.
3 IN PTR alpha-vip.server.com.
4 IN PTR beta-vip.server.com.
101 IN PTR alpha.server.com.
[root@alpha ~]# nslookup 172.168.190.101
Server: 172.168.190.101
Address: 172.168.190.101#53

101.190.168.172.in-addr.arpa name = alpha.server.com.

[root@alpha ~]# nslookup 172.168.190.102
Server: 172.168.190.101
Address: 172.168.190.101#53

** server can't find 102.190.168.172.in-addr.arpa.: NXDOMAIN

[root@alpha ~]#

You should start reading this



I really don't understand what you mean? When you get the NXDOMAIN there is no such entry in the zonefile. E.g:
Anyway whenever you do changes to zonefiles, you need to increase the serial number and reload the zone. Your serial is always 2011071500. Use 2018080801 (today's date) and increase it by "1" anytime you do changes to it.