DNS Server setup and config

Purpose: mapping server to IP address

• DNS  Server       192.168.136.53
• SMTP Server       192.168.136.25
• POP3 Server       192.168.136.110
• Webmail Server    192.168.136.80

domain name <-> IPv4 address

• ns.lab.local        IN A      192.168.136.53
• smtp.lab.local      IN A      192.168.136.25
• pop3.lab.local      IN A      192.168.136.110
• www.lab.local       IN A      192.168.136.80

Answer:

1. Since we only have one test machine (VM), try to add necessary IP address at the same host

$ ifconfig | grep Ethernet | awk '{print $1}' | awk '{ printf("sudo ifconfig %s:0 192.168.136.53\nsudo ifconfig %s:1 192.168.136.25\nsudo ifconfig %s:2 192.168.136.110\nsudo ifconfig %s:3 192.168.136.80\n", $1, $1, $1, $1); }'

2. install bind9

$ sudo apt-get -y install bind9

3. configure with minimal steps

$ sudo vim /etc/bind/named.conf.options

options {

        directory "/var/cache/bind";

        forwarders {

                8.8.8.8;

        };

        dnssec-validation auto;

        auth-nxdomain no;    # conform to RFC1035

        listen-on-v6 { any; };

};

$ sudo vim /etc/bind/named.conf.local

zone "lab.local" {

        type master;

        file "/etc/bind/lab.local.db";

};

zone "136.168.192.in-addr.arpa" {

        type master;

        notify no;

        file "/etc/bind/rev.136.168.192.in-addr.arpa";

};

$ sudo vim /etc/bind/lab.local.db

$TTL 604800

@ IN SOA ns.lab.local. admin.lab.local. (

   2016         ; Serial

 604800         ; Refresh

  86400         ; Retry

2419200         ; Expire

 604800 )       ; Negative Cache TTL

;

;

@ IN NS      ns.lab.local.

@ IN MX  10  smtp.lab.local.

;

ns        IN A      192.168.136.53

smtp      IN A      192.168.136.25

pop3      IN A      192.168.136.110

www       IN A      192.168.136.80

$ sudo vim /etc/bind/rev.136.168.192.in-addr.arpa

$TTL 604800

@ IN SOA ns.lab.local. admin.lab.local. (

          2016         ; Serial

        604800         ; Refresh

         86400         ; Retry

        419200         ; Expire

        604800 )       ; Negative Cache TTL

;

;

53      IN      PTR     ns.lab.local.

25      IN      PTR     smtp.lab.local.

110     IN      PTR     pop3.lab.local.

80      IN      PTR     www.lab.local.

$ sudo service bind9 restart

$ sudo netstat -tupln | grep named | grep 53:53

tcp        0      0 192.168.136.53:53       0.0.0.0:*               LISTEN      9028/named      

udp        0      0 192.168.136.53:53       0.0.0.0:*                           9028/named

$ sudo update-rc.d bind9 defaults

Verification