Shulou(Shulou.com)06/01 Report--

Introduction to GNS: GNS3 is a network virtual software with a graphical interface that can run on multiple platforms (including Windows, Linux, and MacOS, etc.). Cisco network equipment administrators or people who want to pass the Cisco certification exam such as CCNA,CCNP,CCIE can use it to complete the relevant experimental simulation operations. At the same time, it can also be used to virtually experience the Cisco Internet operating system IOS or to verify the relevant configuration that will be deployed on a real router. To put it simply, it is a graphical front end of dynamips, which is easier to use and more operable than using virtual software such as dynamips directly. GNS3 integrates the following software: Dynamips: a simulator that allows users to run the Cisco system (IOS) directly: Dynagen: Dynamips's text display front-end Pemu:PIX firewall device simulator. Winpcap:windows platform is a free, public network access system. The winpcap project was developed to provide win32 applications with the ability to access the underlying network. Excellent network topology simulation Cisco routing equipment and PIX firewall simulation simple Ethernet, ATM and frame Relay switches can be loaded and saved to Dynamips configuration format, that is to say, virtual software using dynamips kernel has good compatibility to support the export of some file formats (JPEG, PNG, BMP and XPM).

Construction and environment deployment of GNS3:

Step 1: installation of GNS3

First of all, we need to download the GNS3 installation package, the installation package resources can be queried online, there is no introduction here.

After downloading the installation package, the next step is to install GNS3. Open the GNS3 folder where the download is completed and select the GNS3 application we want to install.

After you have selected the folder you want to install, the following installation wizard window will pop up, here we can directly click next.

This step is to install the agreement to be accepted by GNS3, here we can just click "agree".

This step is to determine the application we are going to install, which is indeed the GNS3 we are going to install, click to proceed to the next step.

This step is our choice of components in GNS3. It is important to note that we can uncheck Wireshark and Solarwinds plug-ins first, because if you select to install, these two components will be automatically downloaded and installed online, but it is easy to download failure, so we can install these two plug-ins separately later.

This step shows the location where GNS3 will be installed, and of course we can modify the installation path.

At this point, clicking next will bring up the following installation wizard, which is a component we just selected, so select the next step directly.

Here is the agreement we need to agree to when we install this component, just click "agree".

Here is to let us choose whether or not to agree to boot autorun, choose agree to click install.

At this point, our component WinPacp is installed.

When it comes to the last step of installing GNS3, a pop-up window asks if we want to buy an instructional video and click NO to proceed to the next step.

At this point, our GNS3 installation is complete, but since we haven't installed some plug-ins just now, we don't need to start them yet.

When it's time to install the component Winhsark that you just didn't install, first find the location of the installation package.

Double-click to install, which will pop up the following installation wizard window, and click to proceed to the next step.

Choose to agree to the agreement and proceed to the next step.

To install other functional plug-ins for this component, click next.

Whether you want to generate desktop icons or not, in order to facilitate future use here, we will check the box above and click next.

The path of the component to be installed, but remember not to modify the installation path, because if you modify it here, we will also modify it in GNS3. The most important thing is that the installation path must not appear in Chinese!

We have already installed this component in GNS3, so instead of installing it here, click next.

At this point, the preparation for installing Winshark is complete, click to proceed to the next step.

At this point, GNS3 and its components are fully installed.

Step 2: deploy and optimize the environment for GNS3

At this point, we can open GNS3, and the welcome screen pops up, and we choose not to pop up this welcome screen every time.

At this point, we go to the GNS3 page, and a window will pop up to ask you if you want to save the new project, where we can choose to save or save after the project is complete.

Here we introduce the main icons in GNS3 as follows.

There is no router option in GNS3 at this time, so we are going to mirror it. Click on the preferences in the editor selection.

After entering, we choose the router image, and there is nothing at this time, so we need to create a new image.

Click Browse to find the router image file.

Find the router image file and add it.

At this point, the path of the image file comes out, and it is also important to note that Chinese cannot appear in the path.

In this step, we guarantee that the default will not change immediately, and click next.

Memory 128MB is enough, so we don't need to modify it here, just move on to the next step.

Here is the module of the router, there is already a default veneer at the beginning, and we can add it later if necessary.

There is no need for us to make changes here, just keep it by default.

Here is to let us enter the GNS3 value, we can optimize the CPU to reduce the load of LDL, here we do not enter, we will modify it separately.

At this point, our router image is installed, and we can see some of its settings when we enter the router image.

Here is a brief introduction to the operation of GNS3, but it is important to note that some operations can only be modified at device startup.

Now we are going to change the LDAP value, and it is important to note that it can only be modified when the device is started.

The computer will automatically calculate the value of LDL for us, and we can choose it with *.

Here we give a brief introduction to some of the commands in the device operation interface.

In the splicing experiment of two devices, the first step is to give the two devices an IP address of the same network segment.

The following is the experiment, if the following interface appears, it means that the two devices are spliced successfully.

Next we will install and crack CRT.

Click next after the CRT installation wizard pops up.

Click next after checking to agree to the agreement.

There is no need for us to modify the next two steps, just click next by default.

Here we check the add Desktop Shortcut and click next.

Now we are ready to install, but be careful that the installation path is not modified.

At this point, we have completed the installation of CRT, because we have not activated it yet, so we are in no hurry to start it.

Now we are going to crack CRT. First right-click the desktop shortcut to open the location of the file, and then pull the cracked patch into the folder where CRT is located.

Right-click to crack the patch and choose to run as an administrator.

After that, we can see the two options of automatically generating the key and the environment variable in the pop-up window. First, we click on the auto-generate key, and then click the environment variable to set it.

After selecting the environment variable, the following window pops up first, and we select the application to add.

Then the window of the second environment variable pops up, and again we select the application to add.

When the configuration of the two variables is complete, we can open CRT, and then a window will pop up below, showing the path where our configuration file is located, and we can just click OK.

Here is what we need to type in to activate CRT.

Activate what you want to enter and copy it one by one from the window where the patch is cracked.

Here we choose the one below, click OK,CRT and the activation is complete.

We don't have to choose here.

Step 3: realize the interconnection between the two devices

The first one is to use the built-in VPC to connect the switch and interwork.

First of all, we pull out a router and add a veneer to it to make it have the function of a switch.

Next, we pull out two PCs and connect them to the switch. it should be noted that the PC cannot be connected to the interfaces of switches 0max 0 and 0MB 1.

Next, let's go to the running interface of the switch and turn off its routing function.

Configure two PCs with an IP address on the same network segment.

Next, the experiment of interconnection and interworking between two PCs is carried out, and the following interface shows that the interconnection between the two PCs is successful.

The second is to use vmware to connect the interconnection of switches in GNS3.

To complete this experiment, we should first give the two machines in the virtual machine an address on the same network segment.

Start the switch and two host.

Then the other virtual machine is spliced in one of the virtual machines, and the two virtual machines are interconnected if the experimental results are shown in the following figure.

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