How to change dns in Ubuntu 22.04?

How to Change DNS in Ubuntu 22.04?

Understanding DNS and its Importance

Before we dive into the process of changing DNS in Ubuntu 22.04, it’s essential to understand the role of DNS in the network. DNS, or Domain Name System, is a crucial component of the internet that translates human-readable domain names into the IP addresses that computers use to communicate with each other. In this article, we’ll cover the steps to change DNS in Ubuntu 22.04, so you can easily update your network settings.

Required Tools and Information

Before you start, you’ll need to have the following tools and information:

• ip addr command: This command displays the IP addresses and interfaces on your system.
• ip route command: This command displays the routing tables used by your system.
• network-manager configuration file: This file contains the network settings for your system.
• systemadmin configuration file: This file contains the administrator settings for your system.

Step-by-Step Guide to Changing DNS in Ubuntu 22.04

Step 1: Update the Package List

To update the package list, run the following command:

sudo apt update

Step 2: Install the network-manager Configuration File

To update the network-manager configuration file, you need to add the following line to the /etc/network-manager/ Network-Manager/NM.conf file:

[Connection]

enabled = true

dns = examples.com

Replace examples.com with your desired DNS server.

Step 3: Update the Network-Manager Configuration File

To update the network-manager configuration file, run the following command:

sudo nano /etc/network-manager/NM-Config

Add the following line to the end of the file:

DNS = examples.com

Replace examples.com with your desired DNS server.

Step 4: Restart the Network Manager

To apply the changes, restart the Network Manager service:

sudo systemctl restart network-manager

Step 5: Update the Systemadmin Configuration File

To update the systemadmin configuration file, you need to add the following line to the /etc/shadow file:

exitdm dns.example.com

Replace dns.example.com with your desired DNS server.

Step 6: Verify the Changes

To verify the changes, run the following command:

sudo host -t "dns.example.com" ip-addr

This command will output the IP address associated with the DNS server.

Step 7: Test the DNS Changes

To test the DNS changes, try pinging a website or checking your email. If everything is set up correctly, your email and website should be accessible.

Troubleshooting Tips and Considerations

• If you encounter any issues, check the Network Manager logs (/var/log/network-manager directory) for more detailed error messages.
• Make sure to test the DNS changes after updating the package list and Network Manager configuration files.
• Consider adding the DNS server to the /etc/hosts file if you want to add it to the local host lookup table.
• If you’re using a specific DNS service like OpenDNS or Dynamic DNS (DDNS), you’ll need to configure it separately.

Additional Tips and Recommendations

• Use the hostname command to verify that the DNS changes are working:

  hostname -f

• If you’re using a custom DNS server, you can update the /etc/resolv.conf file to point to it:

  sudo nano /etc/resolv.conf

  Add the following line to the end of the file:

  nameserver <DNS_server_IP>

  Replace <DNS_server_IP> with your desired DNS server IP address.

Conclusion

Changing DNS in Ubuntu 22.04 is a straightforward process that requires some basic knowledge and the right tools. By following the steps outlined in this article, you should be able to update your DNS settings and ensure that your network is connected to the correct server. Remember to test your changes thoroughly and consider adding any additional configurations or services to ensure a smooth experience.