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One of the primary functions performed by pfSense® software is filtering traffic. This chapter covers fundamentals of firewalling, best practices, and required information necessary to configure firewall rules.


One of the primary purposes of pfSense® software is to act as a firewall, deciding which traffic to pass or block between networks.


Aliases are collections of addresses that allow many hosts to be acted upon by a small number of firewall rules. They can greatly simplify a ruleset and make it easier to understand and manage.