PF

The PF section of the OpenBSD Handbook provides detailed guidance on configuring and managing the Packet Filter firewall. PF controls network traffic through filtering rules, NAT, redirection, and various advanced features.

This section includes:

• PFCTL Cheat Sheet
  A quick reference for common pfctl commands and options.

• Anchors
  Using anchors to modularize PF rule sets and load rules dynamically.

• Filter
  Writing filtering rules to control inbound and outbound traffic.

• Forwarding
  Enabling and configuring packet forwarding in PF.

• Lists and Macros
  Grouping addresses and defining macros to simplify rule management.

• Load Balancing
  Distributing traffic across multiple servers or network paths.

• Logging
  Capturing and analyzing PF log data.

• NAT
  Configuring Network Address Translation for private network access to the internet.

• Options
  Configuring global PF options that affect rule processing and performance.

• Policies
  Setting default rule policies for packet handling.

• Shortcuts
  Tips and shorthand for efficient PF rule writing.

• Tables
  Using tables to manage large sets of addresses efficiently.