Setup your local DNS server using Webmin.

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Today, you will learn how to setup your local DNS server using Webmin

Webmin is a powerful and flexible web-based server management control panel for Unix-like systems. Webmin allows the user to configure operating system internals, such as users, disk quotas, services, or configuration files, and modify and control open-source apps, such as the Apache HTTP Server, PHP, or MySQL.

Requirements

OS: Ubuntu 22.04
Webmin
DNS Server

Step 1: Install Ubuntu OS and Update

# sudo apt update && upgrade -y

Step 2: Install Webmin

Install dependencies packages

# sudo apt install software-properties-common apt-transport-https

Enable Webmin repository

Add Webmin’s GPG key

# sudo wget -q http://www.webmin.com/jcameron-key.asc -O- | sudo apt-key add -

Manually add Webmin repository

# sudo add-apt-repository "deb [arch=amd64] http://download.webmin.com/download/repository sarge contrib"

Install Webmin

# sudo apt install webmin

Check the status of Webmin

# systemctl status webmin

Allow webmin port 10000 in the firewall

# sudo ufw allow 10000/tcp

# sudo ufw reload

set the webmin password for root

# sudo /usr/share/webmin/changepass.pl /etc/webmin root [new password]

access thourgh web browser

https://your-server-ip:10000

login username: root and your configured password

Step 3: Setup local DNS server using Webmin

Open Webmin -> Unused Modules -> Bind DNS -> Install now

Setup your local DNS server using Webmin.

a. Create an access list and allow your infrastructure network subnets according to your design

Configure global configuration options

click on edit config file

configure as below

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

        recursion yes;
        allow-recursion { localhost; allowed-subnet; };
        listen-on port 53 { localhost; 172.25.81.157; };
        allow-query { localhost; allowed-subnet; };
        allow-transfer { none; };
        // If there is a firewall between you and nameservers you want
        // to talk to, you may need to fix the firewall to allow multiple
        // ports to talk.  See http://www.kb.cert.org/vuls/id/800113

        // If your ISP provided one or more IP addresses for stable
        // nameservers, you probably want to use them as forwarders.
        // Uncomment the following block, and insert the addresses replacing
        // the all-0's placeholder.

           forwarders {
                172.25.80.1;
                8.8.8.8;
           };

        //========================================================================
        // If BIND logs error messages about the root key being expired,
        // you will need to update your keys.  See https://www.isc.org/bind-keys
        //========================================================================
        dnssec-validation auto;
        auth-nxdomain no;
        listen-on-v6 { none; };
};