Configuring BIND DNS Server for Internal Network

In this tutorial, you will learn how to configure the BIND DNS (Domain Name System) server on an Ubuntu server to provide name and address resolution services for clients within an internal network.

Step 1: Install BIND

Begin by installing the BIND software on your Ubuntu server. Open a terminal and execute the following command:

sudo apt install bind9 bind9utils

Step 2: Configure BIND for Internal Network

Edit the BIND configuration files to set up the DNS server for your internal network. Replace the network and domain name placeholders in the following examples with your specific environment details.

Open the named configuration file for editing:

sudo nano /etc/bind/named.conf

Add the following line to include a new configuration file:

include "/etc/bind/named.conf.internal-zones";

Open the named options configuration file for editing:

sudo nano /etc/bind/named.conf.options

Add the following lines to set ACL entry for your internal network and adjust the allow-query and allow-transfer settings:

acl internal-network {
        10.0.0.0/24;
};

options {
        directory "/var/cache/bind";

        # ...

        allow-query { localhost; internal-network; };
        allow-transfer { localhost; };
        recursion yes;

        # ...
};

Create a new configuration file to define your internal zones:

sudo nano /etc/bind/named.conf.internal-zones

Add the following zone definitions, replacing with your own network and domain information:

zone "srv.example" IN {
        type master;
        file "/etc/bind/srv.example.lan";
        allow-update { none; };
};
zone "0.0.10.in-addr.arpa" IN {
        type master;
        file "/etc/bind/0.0.10.db";
        allow-update { none; };
};

Step 3: Configure Zone Files

Create zone files for the defined zones in the previous step. Replace the placeholders with your specific network and domain details.

Create srv.example.lan Zone File

sudo nano /etc/bind/srv.example.lan

Add the following content, modifying as needed:

$TTL 86400
@   IN  SOA     dlp.srv.example. root.srv.example. (
        2020050301  ;Serial
        3600        ;Refresh
        1800        ;Retry
        604800      ;Expire
        86400       ;Minimum TTL
)
        IN  NS      dlp.srv.example.
        IN  A       10.0.0.30
        IN  MX 10   dlp.srv.example.

dlp     IN  A       10.0.0.30
www     IN  A       10.0.0.31

Create 0.0.10.db Zone File

sudo nano /etc/bind/0.0.10.db

Add the following content, modifying as needed:

$TTL 86400
@   IN  SOA     dlp.srv.example. root.srv.example. (
        2020050301  ;Serial
        3600        ;Refresh
        1800        ;Retry
        604800      ;Expire
        86400       ;Minimum TTL
)
        IN  NS      dlp.srv.example.

30      IN  PTR     dlp.srv.example.
31      IN  PTR     www.srv.example.

Conclusion: You have successfully configured the BIND DNS server for your internal network. The DNS server will now provide name and address resolution services for the specified domain and network.

Please make sure to replace placeholders with your own network and domain information while following the tutorial.