Book Image

Configuring IPCop Firewalls: Closing Borders with Open Source

Book Image

Configuring IPCop Firewalls: Closing Borders with Open Source

Overview of this book

IPCop is a powerful, open source, Linux based firewall distribution for primarily Small Office Or Home (SOHO) networks, although it can be used in larger networks. It provides most of the features that you would expect a modern firewall to have, and what is most important is that it sets this all up for you in a highly automated and simplified way. This book is an easy introduction to this popular application. After introducing and explaining the foundations of firewalling and networking and why they're important, the book moves on to cover using IPCop, from installing it, through configuring it, to more advanced features, such as configuring IPCop to work as an IDS, VPN and using it for bandwidth management. While providing necessary theoretical background, the book takes a practical approach, presenting sample configurations for home users, small businesses, and large businesses. The book contains plenty of illustrative examples.
Table of Contents (16 chapters)
Configuring IPCop Firewalls
Credits
About the Authors
About the Reviewers
Preface
7
Virtual Private Networks
11
IPCop Support

Basic Firewall Hardening


First and foremost, we need to consider how IPCop looks to the outside world. The first step taken by any hacker, penetration tester, IT professional, or analyst in assessing the threat that a particular device poses, whether they intend to fix it or break in via it, is to profile that device in order to find out some of the following things:

  • What the device is

  • What operating system it is running

  • What sort of hardware it may be running on

  • What services the server is running, and therefore by inference...

  • What software (services) the server is running in addition to the basic operating system

  • Whether any of the above (particularly the services) are insecure

As a legitimate auditor, manager, and maintainer of IPCop systems, much of this is available to us from memory, from our documentation, or by logging into the host itself. For an attacker, to whom such information is extremely valuable, this is not the case, and so it behooves us to understand how an intruder would gather...