Okay, guys.
So in all of my courses, I intend for the participants that they easily make hands on practice on their
own computers.
So to achieve this purpose in network layer attacks, we're going to use a network emulator.
With his famous name Gns3 or Graphical Network Simulator three.
It's a network software emulator.
It allows the combination of virtual and real devices used to simulate complex networks.
So we'll see how to set one up and use three throughout the course.
However, I do have to say that it's not an easy to use tool.
I'll try to keep it as simple as possible for you, but just stay with me and you'll get it too.
Anyway, if you don't want to deal with the S three, you can skip this section, even though I wouldn't
recommend it.
You'd still be able to make the most of the course.
But like I'm saying, stick with me and I think you'll get it to.
So now let's download and install the Gns3 tool on our host machines.
Since my host system is a macbook, I'll show the installation in Mac OS.
The installation steps are similar in other operating systems, so don't worry, you won't face any
difficulties.
If you do, just let me know and we will go through this step by step.
All right.
So open a browser in your host machine and go to 3.com.
Click Free download.
An account is required to download Gns3 software, so create an account.
You can use your genuine email address.
It's no problem.
Since I already have an account, I'll use a your email address at this time.
So assign a password.
Select a country.
I'll use it for training purposes.
Okay.
Create account and continue.
Select the appropriate install file to download.
My host machine is a mac, so I'll choose Mac.
Download finishes in a couple of seconds.
I mean, if you've got the same bandwidth as I do.
Now select the installation file and double click to start the installation.
I'll just drag the icon and drop it onto the applications folder and that's about it.
So I'm ready to use Gns3.
Now I can go to the applications window and click Gns3 to start it up.
Okay, So in Mac, the files from a developer, which is not identified by Apple, are not allowed to
run.
To GEtrillionID of this.
I'll just go to system preferences, select security and privacy, and you'll see the three dot app
was blocked message Click the padlock icon at the bottom left corner.
Enter your password to allow the changes and click open.
Anyway, right there next to the three was blocked message.
Click open and three starts.