Hi, pfSense is an open source firewall/router computer software distribution based on FreeBSD. It is installed on a physical computer or a virtual machine to make a dedicated firewall/router for a network.
So, if you are looking for the open source firewall, pfSense is the best one.
Learn More: https://www.gns3network.com/how-to-install-pfsense-firewall-in-vmware-workstation/
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