Dns configuration on rhel 5

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How To Configure DNS Server (RHEL-5)
Scenario 1 :

Create DNS Server on your machine based upon following information.

Information :

1. It should be resolve to localhost with recusrsion
2. Open Port No. 53 for you machine’s Lan Card
3. Disable IPV6 for Port No. 53
4. Create a zone file for your domain example.com as
station8.example.com as A 192.168.100.8
station8.example.com as MX 192.168.100.254
5. Also write zone file for abc.com to meet following requirements
6. Verify all the configuration with red hat tools provided in distribution of RHEL 5.

Web : abc.com
192.168.100.5
Primary DNS Secondary DNS Web : abc.com
(Your Machine) (Other Machine) 192.168.100.6
192.168.100.8 192.168.100.254
station8 station254 MX-1 : abc.com
172.16.0.5

Infrastrcture of MX-2 : abc.com
abc.com apps.gmail.com

chat.abc.com
10.0.0.7
You will be
creating DNS
Server Here

Solution :

Step 1 : Installation
Install following packages in your machine using rpm or yum tool
# rpm -ivh bind-9.3.3-7.el5.i386.rpm
# rpm -ivh caching-nameserver-9.3.3-7.el5.i386.rpm
# rpm -ivh bind-chroot-9.3.3-7.el5.i386.rpm

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Step 2 : Start the DNS Server, verify it is working and setup your machine as client
Start tne DNS server using service command and using chkconfig make it to run on
runlevels 2 3 4 5 as below.
# service named restart
# chkconfig --level 2345 bind on
Verify activity on Port No. 53
# lsof -i :53

1. It should be resolve to localhost with recusrsion

By default reursion is set on for localhost. You can verify it from

/var/named/chroot/etc/named.caching-nameserver.conf

This file contains following block where recursion for localhost is set on.

view localhost_resolver {
match-clients { localhost; };
match-destinations { localhost; };
recursion yes;
include "/etc/named.rfc1912.zones";
};

2. Open Port No. 53 for you machine’s Lan Card
To do this you need to comment following lines in

/var/named/chroot/etc/named.caching-nameserver.conf

// listen-on port 53 { 127.0.0.1; };

// view localhost_resolver {
// match-clients { localhost; };
// match-destinations { localhost; };


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// recursion yes;
// include "/etc/named.rfc1912.zones";
// };

By commenting listen-on port 53 { 127.0.0.1; }; we are making the posrt 53 open to all
interfaces. If you want specific the you can do like this

listen-on port 53 { 127.0.0.1; 192.168.100.8;};

We are also commenting the view localhost_resolver { } Block so that query can made from
interfaces other than localhost.

3. Disable IPV6 for Port No. 53 :
You can disable IPV6 query by commenting following lines in options block.
// listen-on-v6 port 53 { ::1; };
// query-source-v6 port 53;
After making the changes, restart the named service and check using lsof command. It should
display following output.

Also make sure comment and few more things to make this DNS server public.
a] Comment allow-query { localhost; }; in options block
b] Add recursion yes; in options block
c] Also add include "/etc/named.rfc1912.zones"; at the end of file.

Your final conf file (/var/named/chroot/etc/named.caching-nameserver.conf) should look like as
below.

options {
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";
query-source port 53;
recursion yes;
};


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logging {
channel default_debug {
file "data/named.run";
severity dynamic;
};
};
include "/etc/named.rfc1912.zones";

4. Create a zone file for your domain example.com as
station8.example.com as A 192.168.100.8
station8.example.com as MX 192.168.100.254
For this purpose you need to edit /var/named/chroot/etc/named.rfc1912.zones
Add following block at the end of file and save it.

zone "example.com" IN {
type master;
file "example.com.zone" ;
};

Now create /var/named/chroot/var/named/example.com.zone file and write as below.

Now verify the syntax of /var/named/chroot/etc/named.rfc1912.zones by using following
command.
# named-checkconf /var/named/chroot/etc/named.rfc1912.zones
This should not produce any errors.


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Now verify the syntax of /var/named/chroot/var/named/example.com.zone by using follow-
ing command.
# named-checkzone example.com /var/named/chroot/var/named/example.com.zone
This command will come up with following output, if there are no errors.
zone example.com/IN: loaded serial 2009012901
OK
Now modify /etc/resolv.conf as below and point your DNS Client to your machine.

Now check the DNS of example.com

You can also use dig command to get complete answers.


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5. Also write zone file for abc.com to meet following requirements
For this purpose you need to edit /var/named/chroot/etc/named.rfc1912.zones
Add following block at the end of file and save it.

zone "abc.com" IN {
type master;
file "abc.com.zone" ;
};

Now create /var/named/chroot/var/named/abc.com.zone file and write as below.

Now verify the syntax of /var/named/chroot/etc/named.rfc1912.zones
# named-checkconf /var/named/chroot/etc/named.rfc1912.zones
Now verify the syntax of /var/named/chroot/var/named/example.com.zone
# named-checkzone example.com /var/named/chroot/var/named/example.com.zone

Run following command to verify the DNS of abc.com


Dns configuration on rhel 5

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