Basic DNS Server - BIND

Hi friends,

This article gives you the basic configuration of Dns-bind server in linux distribution. In this example i have used the chroot bind package.

1. Install the DNS Package (either regular BIND or with BIND chroot):
Check the existence with the command

# rpm -qa | grep bind
ypbind-1.19-7.el5
bind-chroot-9.3.3-7.el5
bind-libs-9.3.3-7.el5
bind-utils-9.3.3-7.el5
bind-9.3.3-7.el5

2. Services:

# chkconfig --list | grep named
# chkconfig --level 345 named on
# /etc/init.d/named start|stop|status|restart or
# service named start|stop|status|restart

3. Firewall - open dns Port:

Open the tcp & udp port 53 from the firewall for the inbound DNS name resolution.

4. vi /etc/hosts:

Set proper name for the dns server host as shown below

127.0.0.1 dns1 localdomain.loalhost localhost dns1.example.com

5. Common location of dns configuration files:

In regular BIND server
named.conf file --> /etc/named.conf
zone files --> /var/named/
In chroot BIND server
named.conf file --> /var/named/chroot/etc/named.conf
zone files --> /var/named/chroot/var/named/

6. Getting the Test Sample File:
Find test sample file configuration using the locate command.

for eg.,

# locate named.conf
# locate .zone

7. For simpler configuration create a symbolic link as

# ln -s /var/named/chroot/etc/named.conf /etc/named.conf

8. configuring : /etc/named.conf

// options for configuring the forwarders
options {
forwarders { 200.200.200.200; };
statistics-file "/var/named/data/named_stats.txt" ;
dump-file "/var/named/data/cache_dump.db" ;
directory "/var/named" ;
};
// root hints details
zone "." {
file "/var/named/named.root";
type hint;
};
// Forward lookup zone details
zone "example.com" IN {
type master;
file "example.com.zone";
allow-update { none; };
};
// reverse lookup zone details
zone "10.168.192.in-addr.arpa" IN {
type master;
file "10.168.192.zone";
allow-update { none; };
};

9. configuring : /var/named/chroot/var/named/example.com.zone

# vi /var/named/chroot/var/named/example.com.zone

ORIGIN example.com.
$TTL 86400
@ IN SOA dns1.example.com. hostmaster.example.com. (
2002022401 ; serial
3H ; refresh
15M ; retry
1W ; expiry
1D ) ; minimum

IN NS dns1.example.com.

IN MX 10 mail.example.com.

IN A 192.168.10.1

dns1 IN A 192.168.10.1
server2 IN A 192.168.10.2
client1 IN A 192.168.10.3

server1 IN CNAME dns1
mail IN CNAME server2

10. configuring : /var/named/chroot/var/named/10.168.192.zone

# vi /var/named/chroot/var/named/10.168.192.zone

$ORIGIN 10.168.192.in-addr.arpa.
$TTL 86400
@ IN SOA dns1.example.com. hostmaster.example.com. (
2002022401 ; serial
3H ; refresh
15M ; retry
1W ; expiry
1D ) ; minimum

IN NS dns1.example.com.

1 IN PTR dns1.example.com.
2 IN PTR server2.example.com
3 IN PTR client1.example.com

11. Restart the "named" Services.

12. Client side configuration :

In Linux Client:

# vi /etc/resolv.conf

nameserver 192.168.10.1
domain example.com

In Windows Client:

Configure the preferred DNS server with DNS server ip address (192.168.10.1).

13. Check the name resolution with the following tool
nslookup
host
dig

Thanks

Logu
logu_microsoft@hotmail.com
91-98414-99143