Book Image

Mastering pfSense - Second Edition

By : David Zientara
Book Image

Mastering pfSense - Second Edition

By: David Zientara

Overview of this book

pfSense has the same reliability and stability as even the most popular commercial firewall offerings on the market – but, like the very best open-source software, it doesn’t limit you. You’re in control – you can exploit and customize pfSense around your security needs. Mastering pfSense - Second Edition, covers features that have long been part of pfSense such as captive portal, VLANs, traffic shaping, VPNs, load balancing, Common Address Redundancy Protocol (CARP), multi-WAN, and routing. It also covers features that have been added with the release of 2.4, such as support for ZFS partitions and OpenVPN 2.4. This book takes into account the fact that, in order to support increased cryptographic loads, pfSense version 2.5 will require a CPU that supports AES-NI. The second edition of this book places more of an emphasis on the practical side of utilizing pfSense than the previous edition, and, as a result, more examples are provided which show in step-by-step fashion how to implement many features.
Table of Contents (15 chapters)

Firewall fundamentals

The fundamental purpose of a firewall is to establish a barrier between trusted internal networks and untrusted external networks. We may sometimes also refer to personal firewalls, which are firewalls placed on individual nodes, primarily to filter outgoing traffic. All networking firewalls have the ability to perform packet filtering, which is the ability to inspect packets and determine if they conform to the packet filter's filtering rules. If they do not match the rules, the packets will be dropped.

pfSense includes the following explicit rules:

  • On the WAN interface, all RFC 1918 networks (private networks) and bogon networks (those not assigned by the IANA) are blocked.
  • On the LAN interface, there are two allow LAN to any rules, one for IPv4 traffic and one for IPv6 networks. These rules allow users on the LAN network to access all other networks...