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is a network security device that monitors incoming and outgoing network traffic and decides whether to allow or block specific traffic based on a defined set of security rules.

Firewalls have been a first line of defense in network security for over 25 years. They establish a barrier between secured and controlled internal networks that can be trusted and untrusted outside networks, such as the Internet.

A firewall can be hardware, software, or both.



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 and has been noted for its reliability and offering a range of features.



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