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

Specifying alternate DNS servers

This recipe describes how to configure pfSense to use DNS servers other than the ones provided by your WAN connection.


Getting ready

In most environments, routers rely on DHCP servers specified by the ISP through their WAN connection. For this reason, by default, pfSense has the Allow DNS server list to be overridden by DHCP/PPP on WAN option enabled. To specify alternate DNS servers manually, we will have to disable this option, which we will do in the following recipe.

How to do it...

  1. Navigate to System|General Setup.
  2. In the DNS Servers section, make the following changes:
    • Specify DNS servers in theDNS Serversedit boxes. You also have an option to select the gateway for each DNS server using the adjacentGatewaydrop-down box. If you want to add more than two DNS servers, click on theAdd DNS Serverbutton, and another edit box will appear.
    • Uncheck the Allow DNS server list to be overridden by DHCP/PPP on WAN checkbox.
  3. Click on theSavebutton.

How it works...

We have...