Steps for DNS Server configuration....

2. INTRODUCTION TO DNS SERVER
 DNS provides the resolution of host names to IP &
vice versa.
. e.g www.wbut.ac.in to 192.168.43.10 (IPv4)
 Defines a hierarchical name space where each level of
the namespace is separated by a “ . ”
e.g 192.168.64.27(class B).

3. Types of DNS Server
Master DNS server:-
Stores authorative records for your domain
Slave DNS server:-
Relies on master DNS server for data.

4. Caching-only DNS server:-
Stores recent requests like a proxy server.
Forwarding –only DNS server:-
Refers to all requests to other DNS servers.

5. DNS Master server configuration
STEP-1:
 bind & caching name server .
 rpm is required to configure
DNS. Check them for install ,if
not installed, install them as
 [root@server~]# rpm –qa cach*
 [root@server~]# rpm –qa bind*

6. DNS Master server configuration
STEP-2:
 Set hostname to
server.example.com .
 [root@server~]# cat/etc/
sysconfig /network
HOSTNAME=
server.example.com
 Set IP address to
192.168.0.254
 [root@server~] ifconfig etho
inet addr: 192.168.0.254

7. DNS Master server configuration
STEP-3:
 Create the main configuration file
for DNS, that is named.conf.
• By default a sample file
 /var/named/chroot/etc/named.
caching- nameserver .conf ,is
created
 Edit this one by named.conf file or
create new one as
 [root@server etc]# vi/
var/named/chroot/etc/named.conf
 Set directory location for
Forward zone and Reverse lookup
zone

8. DNS Master server configuration
 STEP-4:
 Configure example.com.zone for forward zone and 0.168.192.in-
address.arpa for reverse zone. They will be stored in
“/var/named/chroot/var/named/” location.
 Change directory to
 [root@server named]# cd/ var/named/chroot/var/named
 Copy sample file to name we have set in named.conf.
 [root@server named]# cp localhost.zone example.com.zone
 [root@server named]# cp named.local 0.168.192.in-
addr.arpa.zone

9. DNS Master server configuration
 STEP-5:
 Open forward zone file
 [root@server named]# vi
example.com.zone
and modify as

10. DNS Master server configuration
STEP-5 contd:
Open reverse lookup zone file
 [root@server named]# vi
0.168.192.in-addr.arpa.zone
and modify as

11. DNS Master server configuration
STEP-6:
Change the ownership of these zone file to named group.
 [root@server named]# chgrp named example.com.zone
 [root@server named]# chgrp named 0.168.192.in-
addr.arpa.zone

12. DNS Master server configuration
STEP-7:
 Now start the named service
 If service restart without any error then the master name
server is successfully configured

13. Summary
 DNS is an integral part in most protocols
used in the internet.
 Makes the internet human friendly for all
of us..
 Is the world’s largest distributed database
system.
 Fits the international model perfectly.
 In simple terms DNS is a mapping
between names and IP addresses.