Configure DNS server RedHat 6

## Configuring DNS server on REDHAT 6.

Step # 1a: Configure the network Interface like this:



[root@server ~]# ifconfig eth0
eth0      Link encap:Ethernet  HWaddr 00:1D:09:10:49:DC
          inet addr:192.168.0.254  Bcast:192.168.0.255  Mask:255.255.255.0 ## DNS server machine Ethernet
          inet6 addr: fe80::21d:9ff:fe10:49dc/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:578841 errors:0 dropped:0 overruns:0 frame:0
          TX packets:31217 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:59073403 (56.3 MiB)  TX bytes:5895624 (5.6 MiB)
          Interrupt:16

[root@server ~]#

Step # 1b: Set Host Configuration as follows:

[root@server named]# cat /etc/hosts
127.0.0.1       localhost.localdomain  
::1     localhost.localdomain  
192.168.0.254   server.example.com server

[root@server named]# cat /etc/resolv.conf

nameserver 192.168.0.254
search example.com

[root@server named]#

Step # 2: Install Bind.


[root@server ~]# yum install bind*

Step # 3: Edit named.conf: we need to change only three lines in this file:

[root@server ~]# vi /etc/named.conf
options {
        listen-on port 53 { 192.168.0.254; };   ## Enter Your IP Here by !!
        #listen-on-v6 port 53 { ::1; };        ## Comment this line
        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     { any; };        ## Allow Query to DNS from outside world
        recursion yes;

        .
    .
    .                    ## Keep other configuration as it is
    .

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

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

Step # 4: We need to define our Zone file which is done in /etc/named.rfc1912.zones as follows:


[root@server named]# cat /etc/named.rfc1912.zones

zone "example.com" IN {
        type master;
        file "forward.zone";            ; Forward Zone will be defined in forward.zone
        allow-update { none; };
};

zone "0.168.192.in-addr.arpa" IN {
        type master;
        file "reverse.zone";            ; Reverse Zone will be defined in reverse.zone
        allow-update { none; };
};

[root@server named]#

Step # 5: Now we configure Forward Zone and Reverse Zone:

[root@server named]# cat /var/named/forward.zone
$TTL 1D
@       IN SOA  server.example.com. root.server.example.com. (
                                        0       ; serial
                                        1D      ; refresh
                                        1H      ; retry
                                        1W      ; expire
                                        3H )    ; minimum
        IN NS   server.example.com.
server  IN A    192.168.0.254
test    IN A    192.168.0.100            ; Like this we can any number of domains
[root@server named]#


[root@server named]# cat /var/named/reverse.zone
$TTL 1D
@       IN SOA server.example.com. root.example.com. (
                                        0       ; serial
                                        1D      ; refresh
                                        1H      ; retry
                                        1W      ; expire
                                        3H )    ; minimum
        IN NS   server.example.com.
254     IN PTR  server.example.com.
100     IN PTR  test.example.com.           ; Like this we can any number of domains
[root@server named]#

Step # 6: Start Bind.

[root@server named]# /etc/init.d/named start
Starting named:                                            [  OK  ]
[root@server named]#

[root@server named]# chkconfig named on

Step # 7: Check DNS functionality:

## DIG :-

[root@server named]# dig server.example.com

; <<>> DiG 9.7.0-P2-RedHat-9.7.0-5.P2.el6 <<>> server.example.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 30604
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;server.example.com.            IN      A

;; ANSWER SECTION:
server.example.com.     86400   IN      A       192.168.0.254

;; AUTHORITY SECTION:
example.com.            86400   IN      NS      server.example.com.

;; Query time: 0 msec
;; SERVER: 192.168.0.254#53(192.168.0.254)
;; WHEN: Thu Mar  1 10:17:20 2012
;; MSG SIZE  rcvd: 66

[root@server named]#

Let me know if you face any issues... :)