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Operating Systems Linux Red Hat DNS reverse lookup issue
# 1  
Old 06-01-2014
DNS reverse lookup issue
Hi guys. Ok so let me lay out my configs. I can do a NSlookup from client to server BUT NOT a reverse lookup.

DNS server: Optimus.jaydomain.com
IP : 192.168.1.50

DNS Client: Megatron.jaydomain.com
IP : 192.168.1.60


On Sever:

Code:
[root@Optimus etc]# cat /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; 192.168.1.50; };
        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; 192.168.1.0/24; };
        recursion yes;

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

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

        managed-keys-directory "/var/named/dynamic";
};

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

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

zone "jaydomain.com" IN {
        type master;
        file "/var/named/fwd.jaydomain.com";
        allow-update { none; };
};

zone "1.168.192.in-addr.arpa" IN {
        type master;
        file "/var/named/rev.jaydomain.com";
        allow-update { none; };
};




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


Code:
[root@Optimus etc]# cat /var/named/fwd.jaydomain.com
$TTL 86400
@   IN  SOA     Optimus.jaydomain.com. root.jaydomain.com. (
        2011071001  ;Serial
        3600        ;Refresh
        1800        ;Retry
        604800      ;Expire
        86400       ;Minimum TTL
)
@ IN  NS      Optimus.jaydomain.com.

Optimus IN A 192.168.1.50


Code:
[root@Optimus etc]# cat /var/named/rev.jaydomain.com
$TTL 86400
@   IN  SOA     Optimus.jaydomain.com. root.jaydomain.com. (
        2011071001  ;Serial
        3600        ;Refresh
        1800        ;Retry
        604800      ;Expire
        86400       ;Minimum TTL
)
@ IN  NS      Optimus.jaydomain.com.

Optimus IN A 192.168.1.50

100       IN  PTR     Optimus.jaydomain.com.


Code:
[root@Optimus etc]# service named status
version: 9.8.2rc1-RedHat-9.8.2-0.23.rc1.el6_5.1
CPUs found: 1
worker threads: 1
number of zones: 21
debug level: 0
xfers running: 0
xfers deferred: 0
soa queries in progress: 0
query logging is OFF
recursive clients: 0/0/1000
tcp clients: 0/100
server is up and running
named-sdb (pid  22191) is running...


On client:


Code:
[root@Megatron ~]# cat /etc/resolv.conf
search jaydomain.com

nameserver 192.168.1.50


From client:

Code:
[root@Megatron ~]# nslookup Optimus.jaydomain.com
Server:         192.168.1.50
Address:        192.168.1.50#53

Name:   Optimus.jaydomain.com
Address: 192.168.1.50

[root@Megatron ~]# nslookup 192.168.1.50
Server:         192.168.1.50
Address:        192.168.1.50#53

** server can't find 50.1.168.192.in-addr.arpa.: NXDOMAIN


What seems to be the problem ?
# 2  
Old 06-01-2014
Quote:
Originally Posted by Junaid Subhani

Code:
[root@Optimus etc]# cat /var/named/rev.jaydomain.com
$TTL 86400
@   IN  SOA     Optimus.jaydomain.com. root.jaydomain.com. (
        2011071001  ;Serial
        3600        ;Refresh
        1800        ;Retry
        604800      ;Expire
        86400       ;Minimum TTL
)
@ IN  NS      Optimus.jaydomain.com.

Optimus IN A 192.168.1.50

100       IN  PTR     Optimus.jaydomain.com.

Highlighted should be 50
This User Gave Thanks to Aia For This Post:
Junaid Subhani
# 3  
Old 06-02-2014
It worked. Thank you. Can you brief me on why you did that. It will be highly appreciated Smilie

Im new to DNS.
# 4  
Old 06-02-2014
The reverse zone is the opposite to a forward zone, reversing as well the ip
Code:
50.1.168.192 IN  PTR Optimus.jaydomain.com.

For abbreviation sake, most of the time you'll see just the last octet of the unreversed ip.

Code:
50 IN PTR Optimus.jaydomain.com.

Based on that information, you figure out if
Code:
Optimus IN A 192.168.1.50

which you have in /var/named/rev.jaydomain.com belong there or not
Last edited by Aia; 06-02-2014 at 03:49 PM.. Reason: Clarification
# 5  
Old 06-02-2014
I see. Makes perfect sense. Thank you so much for your help Aia Smilie
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