Router Configuration, Ethernet Switching Router, Cisco ASA, DHCP and IP Configuration in GNS3

This article explains how to configure routers, Ethernet switching routers, Cisco ASA, DHCP and IP configuration in GNS3. It provides step-by-step instructions and diagrams for easy understanding. The article also includes information on GNS3, its features, and how it works as a platform for network design.

Table of Contents
Router configuration....................................................................................................................................2
Availability of router configuration.............................................................................................................4
Ethernet switching router.............................................................................................................................5
Cisco ASA...................................................................................................................................................7
ASA installation..........................................................................................................................................7
DHCP configuration....................................................................................................................................9
IP configuration.........................................................................................................................................10
Usage of wire shark...................................................................................................................................11
Final network topology..............................................................................................................................12
References.................................................................................................................................................13

GNS3
GNS is known as graphical network simulator and it works as a platform used to make a
network design. And for that network design it uses the network devices known as routers and
switches. And it uses the devices as real time devices and also in the kind of virtual devices. And
this design is very complex to understand for the user. And it is running by the use of Cisco IOS.
And we can use the function of operating system by the usage of virtual box and gns3. And these
two works as a platform. And in that gns3 it had the function in the way of dynagen. And it use
as a graphical front development in the gns3. And in this IOS commands are used by the usage
of gns3 platform. And in the gns3 it had many features by the use of Cisco. And the gns3 it had
routers to the development of increasing the throughput.
Router configuration
In GSM3 the first step is router configuration. First we need to download the router IOS
image files from browser. All the downloaded IOS images are stored in our system. Next step is
open GSM3; in GSM3 we are using some network topologies and this network topology contains
three different types of routers. The following window represents the basic router configuration
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The above window is just a basic router connection, the switch is used for establish the
connection between these two routers. So we need to download the switch configuration also.
Next step is starting the router. Each router is run separately. Right click the first router then
click the start option, the green color button is available in the menu just click the button then
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the router will be started. After that the red circle is changed to green circle. Then we need to
check the router it’s available or not. So again right click the first router but this time click the
console option, and chance their appearance. Click next, the command window is open. Enter the
command configure terminal for start the execution, command window shows that, the R1 router
is available or not.
Availability of router configuration
The following windows are representing the availability of router one and router three.
First window represent the router one features.
And the second wondow shows the R2 router availability.
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Using these methods we can easily construct the router configuration and also check their
positions. Next one is connection establishment. The Ethernet switch routers are used for connect
the routers. We need to download the series 3640, for design the Ethernet switch router. Go to
the option edit and choose preference, then show the window. We need to place the IOS file of
series 3640, for construct the Ethernet switch router. The below picture represent the IOS router
template.
Ethernet switching router
The Ethernet router works as to get the internet from the provider to the switch and this
makes the signal goes to related device and drawback occurs here when many devices want to
connection from the switch.
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Once the Ethernet switch router is established successfully, then we can easily start the designing
process. The following window represents the basic connections between the routers and
Ethernet switch configuration.
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Next process is design ASA components, the ASA installation need two resources one is
asa842-vmlinuzand another one is asa842-vmlinuzasa. And these two resources are downloading
from the browser. After the download is completed the go edit option clicks preference and goes
to the QEMU < QEMU menu, and click new button, and finally the download ASA resources are
places in this location.
The following diagram shows the network connection using ASA and also installation
process of ASA. The Ethernet router switches are connected by this ASA, and also it connects
the routers.
Using GSM3 the network topology is created easily and also effectively.
Cisco ASA
Cisco ASA it is known as adaptive security application and it also take a place in network
security. And the Cisco provided many function as the image file and for the gns3 platform. And
this security application is used to find the solution for VPN and it had many tools by the way of
Cisco product. And it is known as security device, this device is used for merge the firewall and
anti-virus. In Cisco ASA the risks are easily identified and also solve it.
ASA installation
Go to the menu edit and choose the option preference then the preference table is
displayed. Select the QEMU option and click QEMU VMs, finally browse and store the ASA
IOS image file. Once the ASA installation is completed successfully, just drab the icon and drop
in the window.
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DHCP configuration
Generally this kind of configuration works as to provide the IP address to the system as
dynamically. DHCP server is used to provide the IP address to the system with dynamically and
the address of the internet and the host configuration is made upon dynamically. And it mainly
used for provide the identification to the system.
In that host configuration it uses the command to display the client and server IP address
and also Mac address and the message type and the host name. These are the configuration is
made by using the host configuration.
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IP configuration
In the above diagram it shows the list of commands to execute the configuration and the related
details.
The above window shows computer IP address, and also checks the IP address. The following
format is used for display the IP address, like IP address, subnet mask and default gateway.
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GNS3 using VMware
Step 1
In the above diagram it shows the gns3 package ready stage using the virtual machine. And the
start named as normal start.
Step 2
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And in this figure it shows the loading page of Linux and also the login page.
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Usage of wire shark
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Final network topology
GNS3 lab file is attached
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References
Lencse, G., & Derka, I. (2014). Experimental Analysis of the Fault Tolerance of the PIM-SM IP
Multicast Routing Protocol under GNS3. International Journal Of Advanced Computer
Science And Applications, 5(5). doi: 10.14569/ijacsa.2014.050503
Srivastava, R. (2017). Route Redistribution between EIGRP and OSPF Routing Protocol Using
GNS3 Sofware. International Journal For Research In Applied Science And Engineering
Technology, V(XI), 1232-1237. doi: 10.22214/ijraset.2017.11180
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