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(logo music)

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- So at this point, I'm assuming

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that you downloaded the
GNS3 executable file,

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the application, and
you've also downloaded

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at least one Cisco IOS software image.

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So now we're going to open
up that executable file

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from GNS3, and I'm going
to go through something

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called the Setup Wizard,
which is a series of steps

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you have to go through to get
GNS3 fully up and working.

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Now there's actually
quite a lot to talk about

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during the setup phase here, so I'm going

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to divide this into two
videos, and this is going

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to be part one of that series.

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So let's start with
unpacking that executable,

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or that GNS3 file.

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So in my particular case,

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I've downloaded GNS3,

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right here to this GNS3 file,

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and you can see I've got
various flavors of it.

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As of this recording, version 1.4.4

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is the most recent version of GNS3.

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So I'm just going to go ahead
and double click on that.

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And that brings me to the very first page

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of the GNS3 setup wizard,
so I'll click on Next,

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I will agree to the license,
and I will let GNS3 install

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where it wants to.

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Okay, so here's where we're going

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to spend a little bit of time.

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If you are like me, and when
you get something like this

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that wants to install a bunch
of stuff onto your system,

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you might want to know what
all of these things are,

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and if they're mandatory,
and what they do.

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So let me just spend a little bit of time

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talking about each one of these things.

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Let's start with WinPcap.

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WinPcap is simply a driver.

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It connects to your NIC card,
and it allows your NIC card

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to capture every single
Ethernet frame it sees,

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and then send those
Ethernet frames to some sort

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of application, like maybe
WireShark, or some other kind

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of packet sniffing application.

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So it puts your NIC
card into what's called

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promiscuous mode.

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Without WinPcap, your sniffing
program wouldn't do anything.

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It wouldn't be able to capture anything.

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Or I should say, it would
only be able to capture files

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that are sent to you, in
other words, Ethernet frames

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are sent directly to your
laptop in broadcast frames.

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Any other Ethernet frames
that your Ethernet card sees,

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it normally ignores those
frames, it discards them.

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Well, with WinPcap, it has the ability

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to actually collect everything it sees,

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and then send it to Wireshark.

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Wireshark is a packet-sniffing tool.

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If you've never actually
seen Wireshark before,

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this is an example of what it looks like.

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After you've done a capture, you can see

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every single frame that
your NIC card has collected.

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And you can open up these things,

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you can see every single field
within every single header.

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And this is a great, useful
tool when you're learning

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about networking protocols.

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You know, there's no
better way to learn about

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how OSPF works, or how RIP works,

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than by actually seeing
the packets capturing them

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and seeing every single field in there,

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seeing when a packet generates or triggers

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another packet in response.

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And a packet-sniffing tool like Wireshark,

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and there are others out there as well,

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is a great tool to do that.

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Now along with this, when
you capture your files,

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now you might be wondering,
well, what's Wireshark

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have to do with GNS3?

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Because GNS3 is creating a
virtual networking topology.

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I'm not dealing with real
routers with real cables here.

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Well the nice thing about this
is because GNS3 is bundled

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in, I should say Wireshark is bundled

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into the GNS3 download.

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Once you create your virtual
topology of your routers,

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connected via serial interfaces
or Ethernet interfaces

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or whatever they are, you can
right click on any router,

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I'll show you how to do this,

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and there's a "Capture" option.

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You select which interface you want,

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you could capture off of serial
interfaces if you want to.

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And then it actually
captures all the packets

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on that interface and
displays them in Wireshark.

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Now where this is really,
totally cool and useful is,

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you know, imagine you had
real routers in a real lab,

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and they were all cabled up via Ethernet

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or serial interfaces.

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How would you actually capture
packets in that environment?

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Well one way is, you'd
have to purchase a hub,

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an Ethernet hub, install
it in between two routers,

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connect your PC to that
hub, and then your PC

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would have the ability
to see all the packets

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going back and forth
between those routers.

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That's great if you're
talking about Ethernet.

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But what if I want to capture
stuff on a serial link,

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like if I want to see what
frame relay headers look like,

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or what PPP headers look like.

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Can't do that with a hub.

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Kinda hard with a
back-to-back serial cable

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to capture that stuff.

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But here, in the GNS3 virtual environment,

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it's so easy to do so.

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Now the other thing you're
going to want to do is,

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once you capture your
various files, you're going

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to want to save them, just
click File and Save As,

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and the reason for that is because

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you will see here, in
addition to Wireshark,

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the GNS3 application
downloads these SolarWinds

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response time viewer.

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And what that does is with
that tool, you can import

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your capture file that
you got from Wireshark,

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and then click on Analyze,

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it just takes a couple of moments here,

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and what this does is
it takes all the traffic

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that Wireshark created and
sorts it and categorizes it

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by different high-level
categories you can see here.

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And if you highlight one
of these, or if you just

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actually mouse over
it, you can see you get

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a lot more detailed information

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about the average network response time,

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the average application response time,

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so this is also a really
great tool to just get

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a high-level snapshot of what's going on

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not only in your virtual environment,

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but you can use this in
a real network as well

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to see, what's going on in my network?

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Is there stuff going across my cable

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that I didn't expect to be there?

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So the SolarWinds response time viewer

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is a great tool for that purpose.

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In addition to that, you get Dynamips,

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have to have Dynamips.

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Dynamips is the engine that
creates your emulated router,

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so that's gotta be in there.

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And then you've got Qemu.

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I'm not really going to talk about Qemu,

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that's really for people
who like virtualizing,

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using a virtual machine,
like if you want to have

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GNS3 running with VM ware
or Virtual Box or something,

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then this whole Qemu thing gets involved,

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but I'm not going to go into that

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in this basic tutorial video right here.

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Now the next thing, but
you will want to include,

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don't uncheck it, just
leave Qemu checked as it is,

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cause later on you might want
to use that in your studies,

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VPCS, awesome tool.

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This stands for the Virtual PC Simulator.

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So when you create your
network topology within GNS3

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of your routers connected to each other,

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you might want to have some
PCs connected to those routers.

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For example, maybe you need
something to generate traffic,

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maybe UDP traffic or TCP
traffic, or ICMP traffic,

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going through those routers,
because you want that traffic

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to go through the routers,
and maybe you want to test out

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your access list to see if
they're actually working

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as you expect.

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Or you want to test out your
quality of service policies

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to see if they're working as you expect.

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Well VPCS, the Virtual PC Simulator,

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is a great tool for doing that.

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You can just drop these
virtual PCs into your network,

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connect them to your routers,
and on the virtual PCs

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you can tell them, start
a UDP traffic stream,

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start a TCP traffic
stream, and you can select

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the port numbers and all kinds of stuff,

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which is a great tool
for testing simple stuff

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in your GNS3 virtual topology.

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So fortunately for us, that is built in.

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CPUlimit is just a little
program that, like it sounds,

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it sort of helps GNS3
to work with your CPU

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so it doesn't consume
too many CPU resources.

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Then of course, you have
the GNS3 application itself,

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gotta have that in there.

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And it also comes bundled
in with SuperPutty.

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Now, when you're working with
the Cisco IOS command line,

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you have to have some application

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to display that command line,

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we call that a terminal application.

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And there's lots of terminal
applications out there,

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but SuperPutty is one example
of a terminal application.

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It comes bundled in here with GNS3.

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Now if you are used to using

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a different terminal server application,

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like, for example,
HyperTerminal or SecureCRT,

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or something, you can.

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GNS3 does give you the flexibility

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to use whatever terminal
application you want,

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it's just that it defaults to Putty.

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And then lastly, there's TightVNC Viewer,

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and that's more of an advanced topic,

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I'm not going to get
into the details of that.

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So let's just go ahead and
let it default all this stuff,

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and I'll click Next, and
I'll let it default to the,

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with the file that it
wants to, the folder.

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Now in this particular
case, the text that,

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WinPcap is already running on my machine,

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00:09:07,071 --> 00:09:09,569
it's already installed on
my machine, so I don't need

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00:09:09,569 --> 00:09:12,353
to install it again, but if
you don't get this message,

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you definitely want to
have WinPcap installed

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on your laptop.

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So for example, if you've
never used Wireshark before,

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you've never had a reason
to sniff Ethernet frames

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or packets, you might not
have WinPcap on your laptop,

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and you might need to install it.

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In this case, I'm going
to cancel out of it.

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And right now, it's downloading Wireshark.

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I'm going to cancel out
of Wireshark right here,

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00:09:35,382 --> 00:09:37,677
gonna quit, and I'm going
to cancel out of this

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00:09:37,677 --> 00:09:40,181
because I already have
Wireshark, I don't need

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00:09:40,181 --> 00:09:43,098
to download it, so I'll abort that.

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00:09:44,905 --> 00:09:46,853
I also already have the
response time viewer,

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00:09:46,853 --> 00:09:48,311
I just showed you an example of that.

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00:09:48,311 --> 00:09:50,000
So I'll just cancel out of that as well

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just to speed things
up here for this video.

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00:09:53,731 --> 00:09:55,494
And then now it's
downloading everything else,

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which will be pretty quick.

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And in just a moment here we should be,

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00:10:03,975 --> 00:10:06,888
there we go, setup was
completed successfully.

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And now I click Next,
and now I have the option

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00:10:10,005 --> 00:10:13,735
to get a free license of the
SolarWinds standard tool set.

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You're definitely going to
want this, lots of tools

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available for free, which is awesome,

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so you want to click Yes,
and then when you hit Next,

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you'll actually bring up a web browser,

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or a new tab in your web
browser, that allows you

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00:10:25,092 --> 00:10:27,763
to go to the SolarWinds
website and register

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00:10:27,763 --> 00:10:31,930
for that free license, which
will then be emailed to you.

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And then lastfully, we can start GNS

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by hitting the Finish button here.

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So at this point, I'm going to go ahead

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and stop this video right here.

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This concludes part one of the setup.

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And in part two of the
setup, the next video,

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I'm going to click the Finish button here

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00:10:48,227 --> 00:10:50,235
and we're going to see
what the next steps are

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00:10:50,235 --> 00:10:53,917
to, for example, import Cisco IOS into GNS

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so it has something it can work with.

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So we'll see that in the next section.

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(logo music)