This section will take you through the steps to get started with GNS3 in a Windows environment. All of the critical and most important things to know will be covered, but for an in-depth discussion, see later sections of this document.
Step 1: Download GNS3
Use your Web browser to access
Click on the green Download button.
The easiest way to
install GNS3 in a
Windows
environment is to
use the top file:
GNS3-0.5-win32-
all-in-one.exe.
Click on Mirror 1 or
Mirror 2 to begin
the download.
Click the Save button and then choose a location on your hard drive
to save the file.
Your download will begin. The file is a little under 10 MB in size and
will take less than minute to download on a DSL or cable
connection. Dial-up connections will take somewhat longer.
Step 2: Install GNS3
Find the file you download and double-click on it to begin installing
GNS3.
The GNS3 Setup Wizard will begin. Click the Next button.
Click the I Agree button to continue.
Allow GNS3 to create a Start Menu folder with the default name
GNS3 by clicking the Next button.
GNS3 depends on several other programs to operate. Those
dependencies include WinPCAP, Dynamips, and Pemuwrapper. These
components along with GNS3 are all chosen by default for
installation, so just click the Next button to continue.
A default location is chosen for GNS3. Click the Install button to
accept the default location and to begin the actual installation of
files.
The first dependency for GNS3 is WinPcap. Click the Next button to
begin the WinPcap Setup Wizard.
Click I Agree to accept the License Agreement for WinPcap.
The installation for WinPcap will begin. However, if you have a
previous version of WinPcap on your computer, the wizard will ask
to remove the older version and will then install the newer version.
After WinPcap is installed, the GNS3 Setup Wizard returns to
installing GNS3.
When the wizard finishes, you may uncheck Show Readme and then
click the Finish button.
You have now completed the installation of GNS3.
Click the Start button, All Programs, GNS3, and then
choose GNS3 out of the list of applications installed.
You’ll see the main GNS3 window We’ll discuss its
panes in a later step, but first we have to configure
the location for a Cisco IOS.
Step 3: Defining Cisco IOS files As mentioned earlier, you must provide your own Cisco IOS to use with GNS3 due to licensing issues. GNS3 is meant to be used in a lab environment for testing and learning. Once you have obtained your own copy of a Cisco IOS for one of the supported platforms, you are ready to continue. Current platforms supported include:
1710
1720
1721
1750
1751
1760
2610
2610XM
2611
2611XM
2620
2620XM
2621
2621XM
2650XM
2651XM
2691
3620
3640
3660
3725
3745
7200
On the Edit menu, choose IOS image and hypervisors.
Under the IOS Images tab, click and then find your Cisco IOS
file and click Open. The file will appear as your Image file.
Next, click the drop-down arrow next to Platform and choose the
platform that corresponds to your IOS file.
Now click the drop-down arrow next to Model and choose the
model corresponding to your IOS file.
For now, we’ll accept the default values that
remain. However, there is a very important value
called the IDLE PC value that we will want to
include We’ll get to that later
Click the Save button and then the Close button.
This will return you to the default GNS3 window.
It’s time to create our very first simple topology.
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