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pfSense is an open-source network security software package. The software performs the functions of a firewall, and can also act as a router, DHCP server, DNS server or VPN endpoint. It is based on the FreeBSD operating system with a custom kernel. pfSense can be configured and managed through an intuitive web interface. The software uses the stateful packet inspection functionality of the PF (Packet Filter), along with additional features that allow advanced control over network traffic by filtering packets at the protocol level.

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