Firewall

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

Managing Firewall Rules

Firewall rules control traffic passing through the firewall. These topics describe how to create and manage rules, plus settings related to rules.

• Firewall Rule Basics
• Firewall Rule Processing Order
• Floating Rules
• Firewall Rule Schedules
• Filter Reload Status
• TCP Flag Definitions
• Increasing the State Table Size
• Resetting Connection States

Aliases

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.

• Using Aliases to Simplify Firewall Rules
• Using FQDNs in Aliases
• Understanding Firewall Tables
• Sshlockout Firewall Table
• Virusprot Firewall Table
• Bogons Firewall Table

Firewall Guides

How to perform various tasks with firewall rules.

• Allowing Remote Access to the webGUI
• Restricting Access to the webGUI
• Blocking Instant Message Applications
• Blocking Access to Websites
• Using Easyrule to Add Firewall Rules
• Editing the pf ruleset
• Online Gaming with pfSense
• Troubleshooting Thread Errors with Hostnames in Aliases
• Preventing RFC1918 Traffic from Exiting a WAN Interface
• Firewall Rule Troubleshooting
• Viewing the Full pf Ruleset
• Virtual IP Address Feature Comparison
• Troubleshooting Blocked Log Entries due to Asymmetric Routing
• Troubleshooting Blocked Log Entries for Legitimate Connection Packets