Jason C. Neumann - The Book of GNS3: Build Virtual Network Labs Using Cisco, Juniper, and More
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Networks are everywhere. They connect all kinds of businesses, from local bookshops to huge corporations to universities, across multiple cities and continents. Networks are conceptually simple to understand, yet they are becoming more and more complex, with innovation in areas such as Software Defined Networks (SDN), the Internet of Things (IoT), and other technologies just around the corner.
To understand, design, and manage todays complex networks, network professionals must not only master the theory but also practice and validate concepts in these ever-changing environments. This is where GNS3 comes in: it gives users immense flexibility to build their own networking labs, allowing them to experiment with new network features, capture packets to dissect protocols, and verify configurations for later deployment on real devices. All of this is done without the need to invest in expensive hardware. GNS3 is a powerful and adaptable tool, evolving to now integrate multiple vendors and iterating to meet the growing needs of network professionals. But how do you master GNS3 itself and where do you start?
In The Book of GNS3 , Jason covers everything that network engineers, administrators, and people studying for certifications need to get started, from walking you through installing and configuring GNS3 to creating and managing your projects. Jason digs deep while showcasing the true breadth of the software, covering topics like how to capture network packets, how to connect to real networks and live switches, and how to include advanced systems such as Junipers vSRX Firefly and Ciscos IOS-XRv in your labs. He spends significant time explaining concepts and giving tips that will make you an expert user in no time.
Jasons book is ideal to harness GNS3 and make the most out of your network labs. Whether you are a beginner in the networking space or a seasoned professional, I can guarantee that you will walk away learning something new.
Jeremy Grossmann
Co-founder of GNS3 May 2015
Its been said that it takes a village to raise a child, and GNS3 is everyones baby. Id like to thank all the people who have helped to create and promote GNS3 and make it the awesome software tool that it is. Youre all great!
Special thanks to:
My wife, Sharon, for her patience and for allowing me to be a GNS3 bergeek
Jeremy Grossmann, our benevolent GNS3 dictator
Christophe Follot, the creator of Dynamips, the man who started it all
Julien Duponchelle, the silent code master
Stephen Guppy, who answers more email in a day than I do in a year
Mark Blackwell, GNS3 evangelist extraordinaire
Flvio J. Saraiva, Dynamips guru
Chris Welch, the creator of GNS3 Workbench and Jungle crowd control
Radovan Brezula, who can make any network OS run in GNS3
Daniel Lintottwe can convert that project, but lets use Debian!
Rene Molenaar of gns3vault.com, u bent groot. Dank u veel!
Chris Bryant of the Bryant Advantage, Bulldogs unite!
Jeremy Cioara, Cisco God extraordinaire (grip #1)
Keith Barker, Cisco God extraordinaire (grip #2)
Andrew Coleman, GNS3 Super Moderator, get some sleep!
The GNS3 Crowd Fundersyou know who you are!
Id also like to extend special thanks to everyone at No Starch Press for all their help with creating The Book of GNS3 . In particular, Id like to thank:
Jennifer Griffith-Delgadoyoure the best!
Serena Yangyouve been very patient with me, and youre awesome!
Bill Pollock, the NSP overlord
Because Im a schmuck, Im sure that Ive forgotten loads of important people, but rest assured that I appreciate you too! Let me now say to all you unnamed souls out there: thank you!
I started using GNS3 early in its development and took to it like a duck to water. From the beginning I could see it was going to be an invaluable networking tool. Ive used it to get hands-on experience with operating systems such as Cisco IOS, Junos OS, and Arista, as well as to pass quite a few network certification exams. To this day, I use it on a regular basis to test router configurations before deploying real equipment to the field. The Book of GNS3 is my way of sharing this great resource with other networking professionals, like you.
This book is for anyone involved with networking routers, switches, or firewalls. Whether you use Cisco, Juniper, Arista, Vyatta, or some other network operating system, GNS3 is a great alternative to building physical labs. Unlike labs that use physical equipment, GNS3 virtual labs let you create and save unlimited network configurations, without having to tear apart an existing lab. This book covers all the details to get your projects up and running fast.
The Book of GNS3 guides you through installing, configuring, and running GNS3 on Windows, OS X, and Linux, and it shows you some geeky and fun tricks along the way. Whether youre just getting started or have used GNS3 before, I think youll find a new appreciation for how much is possible when you have the right tool. I dont cover TCP/IP networking fundamentals, but I do provide plenty of examples of how to configure GNS3 devices.
The most effective way of learning is by doing. Thats why I use a tutorial-based approach to creating fully functional multivendor labs using GNS3. The tutorials explain how to build and configure labs using the virtual devices introduced in the chapters. I provide examples of configuring Cisco IOS, Junos OS, and Juniper vSRX Firefly, and more. You dont need to be an expert with network operating systems because Ill guide you step-by-step through the configurations. You could spend days, or even weeks, searching the Web to figure out how to configure features such as connecting to live switches, creating a virtual access server, or connecting your virtual labs to the Internet. But theres no need to do that after you read The Book of GNS3.
The Book of GNS3 guides you through the installation and use of GNS3, and each chapter introduces new concepts that build on skills from previous ones. Youll learn how to create and manage simple to complex projects, using only a single computer or sharing the load across multiple computers.
, covers what GNS3 is and how it works, provides an overview of GNS3, and discusses the benefits of virtual networks.
, discusses installing GNS3 on Windows, OS X, and Linux, and it explains the benefits of using virtual appliances to run GNS3 as an alternative to installing it directly on your PC.
, looks at installing a Cisco IOS image and setting up your first virtual router using Dynamips. Youll also learn the importance of setting an Idle-PC value for Dynamips routers.
, teaches you to configure a virtual router. After that, youll look at all the toolbar options and create a simple two-router network.
, shows you how to install VPCS and use it to add simple PC-like hosts to your projects. Youll learn how to add full-blown virtual PCs using VirtualBox and create a lab using a virtual Cisco IOS router and a VirtualBox Linux PC. Youll then learn about capturing packets using Wireshark.
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