Book Image

GNS3 Network Simulation Guide

Book Image

GNS3 Network Simulation Guide

Overview of this book

GNS3 is an open-source Graphical Network Simulator used extensively by networking professionals to simulate networking devices such as Cisco, Juniper and Vyatta routers, along with Virtual PCs. GNS3 Network Simulation Guide gives you all the information you need to run a successful GNS3 simulation. You will be guided through the tricky installation pre-requisites and procedures involved in developing a simulated topology suitable for studying for Cisco CCIE Certification. We will also cover many useful tips and tricks which will help you make the most of your GNS3 simulator application. You will begin the GNS3 journey by ensuring that you have prepared your computer with any additional files required by GNS3, to set up the simulated environment needed for a successful installation process. Once GNS3 is installed, you will get to work creating a successful simulation including routers, Ethernet switches, Virtual PCs, and capture packets using Wireshark. Next, you will learn how to master GNS3's Graphical User Interface as well as the Command Console. The inner workings of GNS3 are described in depth so that you gain an appreciation of how UDP tunnels are used to tie the many components of GNS3 together. By following the clear examples and exercises in this guide, you will learn everything that you need to know about how to use GNS3 to prepare for certifications, as well as simulate real-world network scenarios.
Table of Contents (14 chapters)
GNS3 Network Simulation Guide
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

The Qemu emulator


Like Dynamips, Qemu is an emulator. In fact, it gets its name by claiming to be a Quick EMUlator. And it is actually able to emulate many more devices than Dynamips, such as Linux servers and Windows PCs, but in the GNS3 environment it is most often used to emulate other networking devices such as Cisco ASAs and Juniper routers.

Adding Qemu support

Also like Dynamips, you will need more than just Qemu. You will also need a binary copy of the operating system you want Qemu to emulate. And because you want to use GNS3 to configure connections between your Qemu devices and even your Dynamips devices, you will also need a third piece of code called qemuwrapper, which is included with your GNS3 install.

And one more thing. The version of Qemu you run has to be aware of the types of interfaces used in GNS3. GNS3 creates UDP tunnels between devices to allow them to communicate (see Chapter 6, Peeking under the GNS3 hood), so you need a specially patched version of Qemu that knows...