DNS Sever Configuration in RHEL5

DNS Sever Configuration in RHEL5 :

Requirements of DNS Server Configuration

         Software’s               : bind* cach *

         Config. Files (1)     : /etc/named.rfc1912.zones

                                          :/etc/named.caching-nameserver.conf

         Port no                    :  53

         Service & Daemon :named

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                                  Configuration of DNS Server

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                                     Server System:

Check & Change Hostname : 

           

                       #vi /etc/hosts

                      #vi /etc/sysconfig/network

Checking the packages:

                   

                   #rpm -q bind

                   #rpm -q caching-nameserver

                   #rpm -q bind-utils

                   #rpm -q bind-chroot

Enter into Config file (1) to set Forward Lookup Zone(FLZ) & Reverse Lookup Zone(RLZ) :

               #vi  /etc/named.rfc1912.zones

:set nu

From 21^st line copy 11 lines i.e; 11yy & paste them at last line(Shift g & p)

& change parameters from 50th-60th lines

i.e; zone “linuxtech4u.com” IN {

          type master;

          file “for.linuxtech4u”;

          allow-update{none;};

          };

Zone “0.168.192.in-addr.arpa” IN{

          Type master;

          File “rev.linuxtech4u”;

          Allow-update{none;};

};

:wq(save & quit).

Copy & Configure FLZ & RLZ :

                      

                  #cd /var/named/chroot/var/named

To copy FLZ:

                  #cp –p localhost.zone for.linuxtech4u

To copy RLZ

                  #cp –p named.local rev.linuxtech4u

To Configure FLZ :

                

 #vi for.linuxtech4u

SOA  server.linuxtech4u.com.

NS    server.linuxtech4u.com

Master        A       192.168.0.254

: wq (save & exit).

To Configure RLZ

#vi rev.linuxtech4u

                  

 SOA  server.linuxtech4u.com.

                  

                   NS     server.linuxtech4u.com.

254             PTR  server.linuxtech4u.com

Note: In this file replace local host with FQDN

i.e. :1, $s/localhost/server.linuxtech4u.com.

: wq (save & exit).

Provide Self System IP in resolv file :

#vi /etc/resolv.conf

nameserver 192.168.0.254

In config file (2) provide Self & Client systems ip :

#vi /etc/named.caching-nameserver.conf

: set nu

In 15 th line no. provide self system ip

In 23 rd & 32 nd line no’s provide client ip’s 192.168.0.0/24

: wq (save & exit).

Restart service to activate changes :

#service named restart

#chkconfig named on

To check try to dig FLZ :

#dig hostname

#dig server.linuxtech4u.com

To check RLZ :

#dig –x ip

#dig –x 192.168.0.254

Note: If the answer comes “1” DNS is configured correctly & if answer comes “0” DNS is not configured properly.

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                                 Client system :

#  vi /etc/resolv.conf

         

          192.168.0.254

         

          : wq

To check FLZ :

#dig hostname of DNS

To check RLZ

#dig –x .

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To check from Windows client

In windows client, provide dns ip in TCP/IP, primary dns column -192.168.0.254.

To check in Windows

Go to start – run – cmd

nslookup server.linuxtech4u.com (FLZ)

nslookup 192.168.0.254(RLZ)

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