How to block specific websites?

To block specific websites using OPNsense, you can use either the built-in DNS resolver or the proxy server (if installed). Here’s a step-by-step guide for both methods:

Method 1: Using the DNS Resolver

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.

2. Navigate to the DNS Resolver:

   • Go to Services > DNS Resolver.

3. Configure Host Overrides:

   • Scroll down to the Host Overrides section.
   • Click on Add to create a new override.
   • Fill in the following fields:
     • 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 (e.g., 0.0.0.0 or 127.0.0.1).
     • Description: Add a description for the override (e.g., "Block example.com").
   • Click Save.

4. Apply Changes:

   • After saving, make sure to apply the changes.

5. Test the Block:

   • Try to access the blocked website from a device connected to your network. You should receive an error or be redirected.

Method 2: Using the Proxy Server (Squid)

1. Install the Squid Proxy (if not already installed):

   • Go to System > Firmware > Plugins.
   • Search for os-squid and install it.

2. Enable the Proxy Server:

   • Go to Services > Proxy Server.
   • Check the box to enable the proxy.

3. Configure Access Control Lists (ACLs):

   • Go to Services > Proxy Server > ACL.
   • Click on Add to create a new ACL.
   • Fill in the following fields:
     • Action: Select Deny.
     • Destination: Enter the domain name you want to block (e.g., example.com).
     • Description: Add a description for the rule (e.g., "Block example.com").
   • Click Save.

4. Apply Changes:

   • After saving, make sure to apply the changes.

5. Test the Block:

   • Try to access the blocked website from a device connected to your network. You should receive an error or be redirected.

Conclusion

By using either the DNS resolver or the proxy server, you can effectively block specific websites in OPNsense. If you have any questions or need further assistance with specific steps, feel free to ask!