LAN Networking: Local DNS Name Not Working in Windows Browser for Ubuntu Home Server 'lenovo'

LAN Networking: Local DNS Name Not Working in Windows Browser for Ubuntu Home Server ("Lenovo")

If you have a home server named "Lenovo" that runs Ubuntu and a couple of HTTP servers, you may encounter an issue where the server is not accessible via its local DNS name in a Windows browser on the same Local Area Network (LAN). This article will provide a detailed context of the issue, cover key concepts, and offer solutions to resolve the problem.

Understanding the Issue

When attempting to access the Ubuntu home server ("Lenovo") from a Windows browser on the same LAN using the server's local DNS name, the browser fails to connect. This issue can occur due to various reasons, including incorrect DNS configuration, firewall settings, or name resolution problems.

Key Concepts

• DNS (Domain Name System) - a system that translates domain names into IP addresses
• Local DNS - a DNS server that resolves domain names within a local network
• Firewall - a network security system that monitors and controls incoming and outgoing network traffic
• Name resolution - the process of mapping a hostname to an IP address

Resolving the Issue

To resolve the issue, you can try the following solutions:

Check DNS Configuration

Ensure that the DNS server is configured correctly on the Windows client and the Ubuntu home server. You can check the DNS settings on the Windows client by following these steps:

1. Press Win + X and select "Network Connections"
2. Right-click on the network adapter and select "Properties"
3. Select "Internet Protocol Version 4 (TCP/IPv4)" and click "Properties"
4. Check if the DNS server is set to obtain an address automatically or if it is set to a specific DNS server

If the DNS server is set to a specific DNS server, you can try changing it to obtain an address automatically or use a different DNS server, such as Google's public DNS server (8.8.8.8).

Check Firewall Settings

Firewall settings can also prevent the Windows browser from accessing the Ubuntu home server. You can check the firewall settings on the Ubuntu home server by following these steps:

1. Open the terminal and enter "sudo ufw status" to check the firewall status
2. If the firewall is enabled, ensure that the necessary ports are open for the HTTP servers
3. To open a port, enter "sudo ufw allow /tcp"

Check Name Resolution

You can check if the name resolution is working correctly by using the "nslookup" command on the Windows client. Enter "nslookup lenovo" in the command prompt and check if the IP address returned matches the IP address of the Ubuntu home server.

Code Block Example

Here's an example of how to open a port on Ubuntu using the command line:

This command opens port 80 (HTTP) on Ubuntu using the Uncomplicated Firewall (ufw) command line interface.

• Check DNS configuration on the Windows client and Ubuntu home server
• Check firewall settings on the Ubuntu home server
• Check name resolution using the "nslookup" command
• Open necessary ports on the Ubuntu home server using the "ufw" command line interface

References

• How to Set Up and Configure a Firewall with UFW on Ubuntu 20.04
• How to Change Your PC's DNS Settings in Windows 10
• Name resolution

This article provided a detailed context of the issue, covered key concepts, and offered solutions to resolve the problem of a local DNS name not working in a Windows browser for a Ubuntu home server. By following the steps outlined in this article, you should be able to access the Ubuntu home server using its local DNS name in a Windows browser on the same LAN.