Cisco IOS image for GNS3

Download Cisco IOS image for GNS3

Hi dear all, that’s really a great to share my hard work  with you , After a lots of  hit in Google  I finally found trick to search Cisco IOS in free of course. So without talking much here are the link where you can free download Cisco ios image and you can upload or use this ios to the router and as well as in GNS3.
Small Collection of IOS Images.
{Updated}Big Collection of IOS Images (Almost All Cisco IOS Images)
Another Big Collection


(NEW)Cisco IOS Images Big Collection v3. **Direct HTTP Link** Binary files for GNS3
New Big IOS Collection


Connecting GNS3 to Real Networks

One of the interesting things about GNS3 is that you can connect your topology to the real world. For some of your CCNA and CCNP studies you may need to run an actual Web browser or Cisco’s Security Device Manager (SDM) among others. Just connect your topology to your real PC. You could even connect to virtual machines running on your computer inside VMware or Virtual PC. I’ve even set up two copies of Windows XP Professional running inside VMware virtual machines. Then, I ran Cisco soft IP Phones that could talk to each other. You could connect your virtual network to a real network as well. Connecting a virtual topology running within GNS3 to real devices is very exciting, but again, your throughput is going to be limited compared to using real equipment for the entire topology. It only makes sense to use GNS3 in a lab environment and for learning purposes.

Drag a Cloud into your workspace. Right-click the Cloud and chooseConfigure. Click on C1 under Clouds, but choose the NIO Ethernet tab.Administrator rights are required (root account under Linux).

For Windows users, click on the box directly beneath Generic Ethernet NIO, and choose the network adapter you wish to use. For Linux users, click on the drop-down box to choose your network adapter (either your real adapter or a loopback adapter). Click the Add button and OK. You will need to configure the IP settings for your computer’s adapter, and then use theAdd a link toolbar button to create your connection.


You may use your regular network adapter, but I usually create an MS Loopback adapter to connect to. In Windows, use the Add Hardwarewizard in Control Panel. Choose “Yes, I have already connected the hardware.” On the next screen, choose Add a new hardware device at the end of the list and click Next. Choose to “Install the hardware manually…”and click Next. Choose Network Adapters in the list and click Next. ChooseMicrosoft as the manufacturer and then Microsoft Loopback Adapter as the network adapter. Finish the wizard. Then right-click My Network Places and choose Properties. You may wish to rename the new Local Area Connectionas MS Loopback Adapter. Also, assign the proper IP settings to the adapter in order to connect to your topology. Linux has a built-in loopback adapter already installed.

Now start your router and assign an IP address to the interface that is connected to the Cloud. You should be able to ping from the router to your PC (loopback interface) and the other way around. Don’t forget to deactivate any firewall that could block pings on your computer.


Also configure:

Configure DNS:

R1(config)##ip doamin-lookup 

R1(config)##ip name-server


Configure NAT:

R1(config)#access-list 1 permit

R1(config)#ip nat inside source list 1 interface fa0/0 overload

R1(config)#int fa0/0
R1(config-if)#ip nat outside
R1(config-if)#int fa0/1
R1(config-if)#ip nat inside


gns3 to internet steps

GNS3(Graphical Network Simulator)

GNS3 (Cisco Hardware Emulator):

How To Install GNS3 1.0 on Windows 8.1

GNS3 1.0 was released to the world on October 21st, 2014. I have been using previous versions of GNS3 for some time now to simulate networks and to practice for my Cisco certifications. For those of you who aren’t familiar with GNS3, it is an application that allows you to build networks for free. The caveat there is you need to supply the images for your equipment. GNS3 supports Cisco, Juniper, HP, Arista, Citrix, and Brocade (as specified on their site, You build out a virtual lab which means there is no need to purchase physical hardware.

Before getting started, you’ll need to sign up on GNS3‘s website. Once you have an account. You can download GNS3. Click on the Windows download button to begin.

Download GNS3 for Windows

Once you open the installation file, click through the standard setup screen and agreement until you get to the Choose Components section.

How to Install GNS3

GNS3 Components

Select all the components you will need – almost everything. SolarWinds is a new application packaged with GNS3. If you already have some of the components installed, such as Wireshark, you can uncheck it.

Location of Installation

After completing installation, Start GNS3.

Upon opening GNS3, you will be prompted to save your new project locally or in the cloud. For the purposes of setting up GNS3 I will skip this.

Store GNS3 project files locally or in the cloud

Click on Edit and then Preferences.

Editing preferences of GNS3

Expand Dynamips and select IOS routers.

Add new IOS images

This is where you must supply your IOS image. I cannot supply these images for you. Click on New to add your image.

Add new IOS image in GNS3

Enter the name of the Image and its platform.

Add a name and platform

Set the amount of RAM to be allocated to IOS.

Allocated ram

Select the default adapters you want installed for each new instance of this device.

The default adapters for the template

After you finish, the router will be displayed with its settings.

List of images

Click on the General tab to view your settings. Make any changes as you see fit.

GNS3 General Preferences

The Console applications tab is where you can configure what application is to be used to console into your devices within GNS3.

Putty for console

The Packet capture tab displays your settings for capturing traffic on links between your devices within GNS3. Notice the capture analyzer command using SolarWindows Response Time Viewer.

Wireshark for packet capture

Click OK to close the Preferences window.

The big window in the middle of GNS3 is your topology view. This is wear you drag and drop devices from the left menu item.

GNS3 Main Window

To add a device, click on one of the symbols on the left and drag and drop the IOS image you’ve uploaded to GNS3.

Click and drag

The Topology Summary window will display a list of all your devices. A red orb signifies a device that is off. A green orb means the device is on.

Right click on your device and click on Start to turn on your device. Right click again and select Console to bring up Putty to manage your device.

Device Menu

Happy labbing! Let me know if you have any questions in the comment section below!