To block websites using the DNS resolver in OPNsense, you can create host overrides that redirect requests for specific domains to a non-routable IP address. Here’s a step-by-step guide on how to do this:
Step 1: Access the OPNsense Web Interface
- Open your web browser and navigate to the OPNsense interface (e.g.,
https://192.168.1.1). - Log in with your administrative credentials.
Step 2: Navigate to the DNS Resolver
- In the main menu, go to Services > DNS Resolver.
Step 3: Configure Host Overrides
- Scroll down to the Host Overrides section.
- Click on the Add button to create a new override.
Step 4: Fill in the Host Override Details
- Host: Enter the domain name you want to block (e.g.,
example.com). - Domain: Leave this blank or enter the domain (e.g.,
com). - IP Address: Enter a non-routable IP address, such as
0.0.0.0or127.0.0.1. This will effectively block access to the site. - Description: Add a description for the override (e.g., "Block example.com").
Step 5: Save the Configuration
- Click on Save to save the host override.
- After saving, make sure to apply the changes if prompted.
Step 6: Test the Block
- Try to access the blocked website from a device connected to your network.
- You should receive an error message or be redirected, indicating that the site is blocked.
Additional Considerations
- Multiple Domains: If you want to block multiple websites, repeat the process for each domain you wish to block.
- Wildcard Blocking: If you want to block all subdomains of a domain (e.g.,
*.example.com), you may need to create separate entries for each subdomain or use a wildcard if supported. - DNS Caching: If you have previously accessed the site, you may need to clear your browser cache or DNS cache on your device to see the changes immediately.
Conclusion
By following these steps, you can effectively block websites using the DNS resolver in OPNsense. If you have any questions or need further assistance with specific steps, feel free to ask!
