Firewall blocking access to a website is a basic function, blocking access to a website on pfSense can usually be done by aliasing and setting firewall rules.
In this example, let's try to block access to Sina.com (www.sina.com).
Find the domain name resolution address
Add alias
Set firewall rules
Check for blocking effects
Find IP address
The alias of pfSense does not support domain names, we must first find out the IP address of Sina.com.
In Windows, run cmd and enter Nslookup www.sina.com to find the corresponding domain name resolution address of Sina.com in DNS. In this case 117.21.216.80.
Add alias
Enter the GUI interface of pfSense
Navigate to Firewall > Alias Management > IP
Click to add
Add Sina's IP address to the alias
Click to save settings
Set up wall rules
Navigate to Firewall > Rules & Policies, lan tab
Add a rule to the top of the list
Select block for action, select any for source address, select single machine or alias for destination address, and enter the alias name defined earlier
Click to save settings
Check for blocking effects
The firewall rules have taken effect, and now we enter the website of Sina.com www.sina.com in the browser to access, and it is no longer accessible.
