Book Image

pfSense 2.x Cookbook - Second Edition

By : David Zientara
Book Image

pfSense 2.x Cookbook - Second Edition

By: David Zientara

Overview of this book

pfSense is an open source distribution of the FreeBSD-based firewall that provides a platform for ?exible and powerful routing and firewalling. The versatility of pfSense presents us with a wide array of configuration options, which makes determining requirements a little more difficult and a lot more important compared to other offerings. pfSense 2.x Cookbook – Second Edition starts by providing you with an understanding of how to complete the basic steps needed to render a pfSense firewall operational. It starts by showing you how to set up different forms of NAT entries and firewall rules and use aliases and scheduling in firewall rules. Moving on, you will learn how to implement a captive portal set up in different ways (no authentication, user manager authentication, and RADIUS authentication), as well as NTP and SNMP configuration. You will then learn how to set up a VPN tunnel with pfSense. The book then focuses on setting up traffic shaping with pfSense, using either the built-in traffic shaping wizard, custom ?oating rules, or Snort. Toward the end, you will set up multiple WAN interfaces, load balancing and failover groups, and a CARP failover group. You will also learn how to bridge interfaces, add static routing entries, and use dynamic routing protocols via third-party packages.
Table of Contents (18 chapters)
Title Page
Copyright and Credits
About Packt

Using tcpdump

When you are troubleshooting network problems, you may find it necessary to use packet capturing, which is also known as packet sniffing. One way you can perform packet capturing is by using tcpdump, which is a command-line tool.

This recipe describes how to use tcpdump in pfSense.

How to do it...

  1. Navigate to Diagnostics | Command Prompt.
  2. In the Execute Shell Command text field, enter tcpdump, along with any parameters you wish to pass to the program. For example, tcpdump -w output_file will save tcpdump’s output to a file.
  3. Click on the Execute button.
  4. The output should be displayed as follows: