Gns3 network simulation guide pdf

Continue GNS3 is an open source Graphical Network Simulator widely used by network professionals to simulate network devices such as Cisco, Juniper and Vyatta routers, along with virtual PCs. The GNS3 Network Simulation Guide gives you all the information you need to run a successful GNS3 simulation. You will be guided through the complex pre-preparation installations and procedures involved in the development of simulated topology suitable for training for Cisco CCIE certification. We'll also cover a lot of useful tips and tricks to help you make the most of your GNS3 simulator app. You'll start the GNS3 journey by ensuring that you've prepared a computer with any additional files required by GNS3 to customize the simulated environment you need for a successful installation process. Once you've installed GNS3, you'll start working on successful simulations, including routers, Ethernet switches, virtual PCs, and packet capture with Wireshark. Next, you'll learn how to master the GNS3 graphical user interface as well as the command console. The inner workings of GNS3 are described in depth, so you get an understanding of how UDP tunnels are used to link many GNS3 components together. By following the clear examples and exercises in this guide, you'll learn everything you need to know about how to use GNS3 to prepare for certification, as well as simulate real-world network scenarios. Publish Date: October 2013 This chapter gets you through the first hurdles you'll strike in your quest to have a graphic network simulator (GNS3) running on your computer, and it comes in three parts: preset tasks and prerequisites, the installation process, and after installing the tasks required to create the first simulation. In the process, you'll get an assessment of other applications and software that all contribute to GNS3. I'll explain the reasoning behind the few steps you need to take to set GNS3 successfully and finish the chapter with you well prepared to build your first simulation imitating Cisco routers. The following topics will be covered in this chapter: Presupling Tasks and Preconditions: GNS3 Image Files Download process: Installing on WindowsInstalling on OS XInstalling on Linux MintPost installation tasks After this chapter you should have GNS3 running on your computer ready to create your first network simulation. The first condition is that the installer understands that GNS3 is not a normal application! It's a set of inter-working applications and operating systems, each with its own memory and processor requirements. You're not going to get the GNS3 installed and running as fast as you might some other standalone application. But you probably already know what I'm guessing, you're reading this this because you have at least already installed, or tried to install GNS3, and hit the point where you realize that you need to know more. To solve this problem, I'll start with some important knowledge that will help you see the bigger picture. If you're new to GNS3 or a new network modeling concept, you won't let you read page before proceeding. GNS3 can be seen as a meeting place for various operating system emulators. The most famous and most important of these is Dynamips. Dynamips allows you to emulate Cisco routers and provides a collection of shared devices and interfaces. Other emulators supported by GNS3 are: Earth: This provides emulation devices Cisco ASA, Juniper Routers, Vyatta routers and Linux hosts. Pemu: This is a variation of the earth used exclusively for Cisco PIX firewalls. VirtualBox: This provides emulation of Juniper routers, Vyatta routers, linux hosts, and Windows hosts. Every instance of the router or any other device that you run is going to spawn a copy of its own operating system that will compete for your computer's RAM master and processor cycles. You'll run a few computers in your computer, so remember that as your computer's processor heats up and your fans start to whirl more loudly. Now consider that devices such as routers and firewalls require a kind of application to give you access, so meet the next member of the extended GNS3 family, your terminal app. Depending on the operating system, your terminal application may be Gnome Terminal, iTerm2, , PuTTY, SecureCRT, SuperPutty, TeraTerm, Windows Telnet client, or even .No question which terminal app you choose, it will consume more resources for every session you opened, although that is minimal. Finally, there are two other related applications that are not essential but are often used in conjunction with GNS3. These apps are:Wireshark: This is a popular app for capturing open source packages. Virtual PC Simulator (VPCS): This allows you to simulate up to nine PCs that you can use for pinging, tracing and more. And of course they also need a processor and RAM when you use them. So before you start thinking about running GNS3 on your computer, you better make sure it's up to work, but it will depend heavily on how many devices you plan to include in the simulation, how much memory you allocate to these devices, and how well you can adjust the value of PC downtime (discussed in Chapter 2, Creating Your First GNS3 Simulation). I successfully run GNS3 with one on a Pentium IV-based computer with 1.5GB of RAM. Running two routers on the same computer is possible, but slower. I'm going to chase. You need as much memory as you can afford. I wouldn't want to run GNS3 on less than 2GB of RAM, and I'd buy 16GB or more if I could afford it. And router router router can be an intense processor. The quad-core processor will be awesome, but Pentium IV can get you started. Multi-core processors are especially useful if you're going to use qemu or VirtualBox emulators. However, if you want to be more accurate, you should be able to calculate how much of your RAM is consumed by your operating system itself, with as few other programs as possible working, and then add the amount of RAM that GNS and related programs consume, and finally add the amount of RAM you will allocate to your devices. The most important task of pre-installation for GNS3 is the finished image file of the router. It's often a task that forces people to give up GNS3 before they get to work, but it's necessary because Dynamips (or Earth or VirtualBox) is nothing more than an emulator, and it's going to need an image operating system to follow! For example, if you plan to emulate the Cisco 3725 router, your image file can be called c3725-adventerprisek9_ivs-mz.124-25b.bin.Note: Getting relevant image files for the router is your responsibility. It may be necessary to buy some of the equipment you want to emulate and copy images files from the equipment you have. Regardless of your file the images (s) are, prepare to install by copying the image files in the appropriate places listed below. You will need to create GNS3 and image directories as you go. If you have a maintenance contract with Cisco, you can download router images for your router from the Cisco Software Center. If you have an ASA device, you'll probably find copies of the software on the accompanying CD, or again you can get the device software from Cisco, provided you bought a maintenance contract. For Cisco routers, I recommend using images of the Cisco 7200 or 3725 router. Most of the examples in this book would be to use the Cisco 3725 router because it doesn't require a configuration to get started. For serious simulations, I would recommend using 7,200 routers because the 7200 is the model for which Dynamips was developed, and this router also supports Cisco iOS (Internet Operating System) Version 15.The story is similar to for Junos - operating system for Juniper routers. You can easily find Junos software on the Juniper website, but you will need to use the client's login to download the software. Downloading images of the Vyatta router is much easier because Vyatta is an open source project. You can Images of the router based on the land and the virtual box based on Vyatta directly from the GNS3 download page sourceforge.net: - look in the catalogs of devices qemu or VirtualBox Appliances. However, getting a vyatta router works much harder than Cisco routers discussed here. Deploying Vyatta routers is discussed in Chapter 4, unleashing other emulators. Now, if you have one or more router images in the image catalog, both you're ready to install GNS3 before. The following examples suggest that you have an image of the Cisco 3725 router in the image catalog. Depending on the operating system and the features you want to use, you may need to download more than one app to get GNS3 running. However, there is no better place to start than on the GNS3 website: only you will find links to the latest GNS3 downloads for Windows, OS X (Macintosh) and Linux, but also a list of links to some of the other related software that you may need. The installation process is very different for each operating system. If you're working with a version of Windows, the only installation package you need is an all-in-one package, although it may take a little more work to install and run. For OS X and Linux users, your tasks will be much more detailed. Download and install an all-in-one package from . During the installation process, you'll be able to select the packages you want to install. I recommend you choose to install SuperPutty during installation. It will then become your default console app, otherwise PuTTY will be your default console app. However, keep in mind that SuperPutty will download and install the .NET framework the first time it works (it's huge and time consuming) and requires a reboot as well. During installation, you'll need to confirm any Windows UAC issues or licensing agreements you may encounter, and in the case of Windows 8, you may even be aware of the compatibility issue with installing WinPcap. If so, just choose to run the program without getting help. Once the installation is complete, go ahead and start tasks after installation in this chapter. There is no all-in-one package for OS X, so you have to find the bits you need and install them one by one. Here's what you need to download in addition to GNS3. Use the latest version, and for the installation process, I'll assume that the following apps have been downloaded. Step 1: Install the X'X11With OS X, best set by Wireshark to GNS3, but Wireshark uses the X11 display, so first you have to install the X11. X'quartz is a version of the X11 created by Apple.Open's X'quartz community project, in the .pkg installation file, accepting all agreements and entering a password if necessary. When the X'quartz installation is complete, you will have to log out and log on again. I suggest running X'quartz after logging back in (it gets installed in/Apps/Utilities catalog) to make sure the installation has gone smoothly. You should see the open Xterm window. Step 2: Install WiresharkI recommend you install Wireshark before GNS3. This is that, as explained in Read me first.rtf, Wireshark Wireshark A script that regulates permissions on system packet capture devices (/dev/bpf) when the system is launched. Having these permissions will make life easier for GNS3 installation. Wireshark comes as a .pkg installation file. But (at least on Mountain Lion) your default security preferences will prevent you from installing it. To circumvent security preferences, you need to run the installation package by clicking the right button (or qlt;Ctrl)'gt;clicking on the package and selecting Open. If necessary, accept all agreements and enter the password. You will launch Wireshark when the installation is finished. When you first launch Wireshark, it will ask about the location of your X11 app - which is X'quartz. Click on the View button and find X'quartz in/Apps/Utilities/. Then you have to drop Wireshark and run it again, being patient as he builds his cache. Note: Wireshark always launches X'quartz when it works, and you'll need to switch to the X'quartz window, not the Wireshark window when switching between apps. Step 3: Install the GNS3Open GNS3 .dmg you downloaded where you'll find one app - GNS3. Drag the GNS app into the app directory to install it. However, your GNS3.app is more packed away than just GNS3. Not exactly an all-in-one package like Windows, but it includes a copy of Dynamips and VPCS that you'll be using soon, as well as a copy of the Earth emulator that you'll use later. Once the installation is complete, go ahead and start the task section after installation. There are many variations of Linux, but when it comes to software distribution, there are two main flavors of the setup - about/min (based on Red Hat) and Deb (based on Debian). Since there's actually a way to install GNS3 from the deb package, I decided to use the Linux Mint 15.0 (Cinnamon) desktop as a fundamental Linux flavor to describe the installation process. This process should also work on other debian Linux flavors, including Ubuntu. For other Linux flavors like Red Hat, check out the GNS3 forum and go ahead, seek help if you need it. Step 1: Prepare the repositoryIn the original GNS3 files are currently stored in the Private Packages Archive (PPA). Before you can use PPA, you must first give your Linux system permission to use it. From the Linux command line, give out the next command to prepare your system for using the GNS3 PPA. In the meantime, you should make sure that your repository is up to date by running the APT-get update from the terminal window.sudo add-apt-repository ppa:gns3/ppasudo apt-get updateStep 2: Install Dynamips and GNS3Before you install GNS3 you need to be sure that Dynamips is installed first. The next team ensures that you get the last one of both, and also set apt-get install gns3 dynamipsStep 3: Install VPCSAs with other packages, VPCS is also part of the PPA and qlt;/Ctrl'gt; In the same way as shown: sudo apt-get install vpcsStep 4: Install XtermGNS3 requires Xterm to run VPCS and Team Terminal tools. Xterm is often set by default on Linux, so the next command will update your installation to the current version if it's already installed, or install it if it's not.sudo apt-get install xtermYou now ready to start post-installation tasks. No matter what OS you installed on GNS3; The next challenge is to run GNS3. The Custom Master will appear. Note: When GNS3 starts, it searches for the GNS3/gns3/gns3.ini settings file (OS'X/Linux) or %APPDATA%-gns3.ini (Windows). If it doesn't exist, it launches Master Settings. If the master setup isn't up and running, log out of GNS3, delete that file and run GNS3 again. This process is similar to that of each operating system, and the Windows setting is shown here, with links to other operating systems as needed. Warning: Double check that you have fulfilled this important precondition and already has a router image in the image catalog, otherwise you will not be able to complete all the steps that the Master of Settings will take you through. This is the most important part of the installation, and the most difficult! Don't give up, I'll help you get through this. The first step is to set the way to the OS image catalog (IOS, qemu, PIX, etc.). Keep in mind that you copied the images to the %HOMEPATH%-GNS3-Images catalog before installation. (Or your q/GNS3/Images catalog). Click on number 1 to bring the GNS3 Preference dialogue to general settings. Note that the OS catalog (IOS, qemu, PIX, etc.) is set in the catalog where you copied the images. If that's not right, change it now. Also note that there is a catalog of projects. It should be installed on the same GNS3 catalog branch as your OS images (IOS, qemu, PIX, etc.). Click on OK and you'll be asked if you want to create catalogs of projects and images. Click on Yes to GNS3 to create a directory of projects for you. Back to set up the master, click on number 2 to bring up GNS3 Dialogue Preferences for Dynamips. The key here is to press the Test Settings button. This is necessary to test the correctness of the path to Dynamyps. If you don't see a message like Dynamips 0.2.10 successfully launched, then you will need troubleshooting. The most likely reason is that the path to Dynamips is wrong or Dynamips has not been set correctly. Click on OK to reject the preference dialogue and return to master settings, where you will now click on number 3. This will open up a dialogue between iOS images and hypervisors. This is the dialogue in which you report to GNS3 which of the iOS images you have copied to the catalog of images you want to use. Process harder, so use the following chart to help. Step 1: Select Click image file on the ellipse next to the File tip. The browser file will open in the image catalog. Choose an iOS image and click on OK. If the image is compressed (which is probably if this is the first image you chose), then you will be presented with a dialogue asking if you would like to unpack it. Some images just wouldn't work if they weren't unpacked, and it's always a good idea to unpack the image anyway because your simulated routers will load much faster. By convention, compressed images use .bin extension, and uncompressed images use .image extension. Keep walking. Your image hasn't been added yet! Step 2: Tune in to idle-PC There have been many tears of crying, many heads pounding and a lot of frustration suffered by people who neglect this rather indivisable feature. The actual reason for the cost of PC downtime, and what it does, is discussed in Chapter 2, Creating Your First GNS3 Simulation. At this point, just rejoice that since GNS3 is 0.8.4, there is an easy way to automatically calculate the cost of PC downtime - perhaps saving hours searching for good value. Without the cost of PC downtime, your routers potentially run your computer's processor up to 100 percent. I suggest you open your Windows Task Manager (or run from the top in the terminal window on OS X/Linux) before you start this process so you can watch the use of the processor as GNS3 attempts to find the value of PC downtime. Warning: During this step, your computer is likely to become unresponsive from time to time. Make sure your computer isn't busy with other important tasks at this point. Click on the automatic calculation button for Idle-PC. There will be a dialogue about progress. Don't be alarmed if your computer's processor jumps 100 percent several times during this process, or even if you see messages that don't respond to the app. If GNS3 fails to find good PC downtime value, you'll find that you couldn't find a working message for the cost of PC downtime. Before you try again, make sure you have absolutely all the other apps on your computer closed (except perhaps Windows Task Manager) and try again. When the process is complete, close the conversation. Additionally, you can now click on the Testing Settings button, which simply uploads an image of the router so you can check the use of the processor. If CPU usage is still high, look at the previously allocated Idle PC value and try again. Keep walking. Your image can't yet be added! Step 3: Save the settingsIf you used automatic calculation, then GNS3 would save the configuration automatically, but if you manually typed your own PC outage or left it Then you need to click on Save before your settings are saved for that image. If you try to add a different image before saving, you just rewrite the one you've already chosen. Unfortunately, there is no warning if you click on Close without saving. The best thing you can do is look at the list of images at the top of the window. If your image doesn't there, then you can be sure that it has not been saved. Step 4: Check out the basic configGNS3 doing your best to try to make things easy for you, but some features do so by making GNS3 simulations smaller as a real hardware router. Basic confit is such a feature. When downloading the hardware router for the first time, you are greeted on the console with a message: But if you have a database configuration file specified, GNS3 loads the router with the configuration of this file applied, which is a great time saver and even helps in keeping your processor under control if you have many routers. (Having a lot of routers sitting on yes/no hint can splash your CPU). You can edit the database database baseconfig.txt if you want to customize it, or even have another file for each router image. By default, it's in the image catalog. Or, if you want your simulations to be more real and downloaded into the System Configuration Dialogue, and a yes/no hint, you can remove this setting by leaving it empty. But be sure to click on Save again after removing the field. In this chapter you learned about the GNS3 application family, and hopefully now better appreciate the many participants in this product. Now you know how to work if your computer is powerful enough to cope with the size of the simulation you want to run. You've followed the process of downloading the relevant files to install and install them in the recommended order, and you've gone through the main stages of installing image and project directories, testing the Dynamips installation, and customizing at least one iOS image ready to be included in the simulation. Ideally, you'll find good idling value for this image, and now you have a GNS3 work installation ready to build your first GNS3 project with Cisco emulating routers and virtual PC Simulator, which of course is what you'll be doing in the next chapter. More Unlock this book with a free 10-day trial gns3 network simulation guide pdf. gns3 network simulation guide pdf free download. gns3 network simulation guide pdf download

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