GNS3 - Basic Router Configuration (part 8)

Learn Extended Ping and modification of parameters using ping.

Image Source

What Will I Learn?

You will learn about Extended Ping.
You will learn to modify parameters using extended ping.
You will learn to define any IP address as Source address and ping from any defined address from a single port.

Requirements

Windows 7(32 bit) or more, Any Linux Distro - Debian/ Ubuntu are provided and supported
Cisco IOS device images.
GNS3 Software.

Resources

Website http://www.gns3.com/
Github Code Link: https://github.com/GNS3/gns3-gui
Installation: https://gns3.com/support/docs
License: GNU General Public License

About GNS3

Graphical Network Simulator-3 (shortened to GNS3) is a network software emulator first released in 2008. It allows the combination of virtual and real devices, used to simulate complex networks. It uses Dynamips emulation software to simulate Cisco IOS.
GNS3 is used by many large companies including Exxon, Walmart, AT&T and NASA, and is also popular for preparation of network professional certification exams. As of 2015, the software has been downloaded 11 million times.
Source

Difficulty

Difficulty is at an Intermediate level.

Description

GNS3 or Graphical Network Simulator is a simulator used for virtual network designs, This software is an open source software and supports Cisco routers and switches by using an emulator known as dynamips. In this video Tutorial we will learn to use extended ping commands which give us the option to modify many parameters and helps in testing the accessibility of the devices on a network. Now i will write down the various steps which will help to explain the video tutorial in a better way.

Step 1

Before you could start using the extended ping commands you will have to form a network. In the video I have started with a network which consists of four routers R1, R2, R3, R4 and four switches SW1, SW2, SW3 ,SW4 where SW2 is connected to R1, SW1 to R4, SW4 to R3. SW3 to R2. So simply drag and drop the routers and switches that you need and form a network by connecting them with serial and straight cables. Serial for Router to Router and Straight for switches to router connections. The network design is also shown below with an image below.

Step 2

The next step will be to configure IP address to the ports connected to R1 and similarly to all other ports of other routers have to be configured. The ports of the R1 to be configured are interface serial 0/0, interface serial 0/0 and interface fastethernet 0/0.

The configuration of Serial port 0/1 is shown below.

 interface serial 0/1
ip address 192.168.1.1 255.255.255.252
no shutdown
exit
do wr

The configuration of Fastethernet port 0/0 is shown below.

interface fastethernet 0/0
ip address 192.168.3.1 255.255.255.0
no shutdown
exit
do wr

The Configuration for serial port 0/0 is shown below.

interface serial 0/0
ip address 192.168.2.1 255.255.255.252
no shutdown
exit
do wr

The configuration for this step is also shown below with the help of an image.
PicsArt_04-20-10.58.05.jpg

Step 3

The next step will be to configure interfaces of the router 2 (R2), the ports configured here are serial port 0/0 and fastethernet port

The configuration for serial port 0/0 is shown below

interface serial 0/0
ip address 192.168.1.2 255.255.255.252
no shutdown
exit
do wr

The configuration of the fastethernet port 0/0 is shown below

 interface fastethernet 0/0
ip address 192.168.4.1 255.255.255.0
no shutdown
exit
do wr

The configuration for this step is also shown below with the help of an image.
PicsArt_04-20-10.53.21.jpg

Similarly R3 and R4 must be configured.

Step 4

The final step of the tutorial will be to run extended ping command on one the configured routers. The extended ping command is used in the privilege mode by typing ping and pressing Enter.

R1# ping

Following parameters can be modified.

Protocol [ip]

Specify the protocol, such as appletalk, clns, novell, apollo, vines, decnet, or xns. The default is ip protocol.

Target IP address

Specify the IP address or hostname of the host you wish to ping.

Repeat count

We must specify the number of ping packets that will be sent to the destination address. The default is 5.

 Datagram size

We must specify the size of the ping packet (in bytes). The default is 100 bytes.

Timeout in seconds

We must specify the timeout interval. The default is 2 seconds. The echo reply needs to be received before the timeout expires, in order for ping to be successful.

Extended commands

We must specify whether or not a series of additional commands will appear. The default is set to no.

Source address or interface

We must specify the interface or IP address of the router to use as a source address for the ping packets. We can choose any interface to ping from by using this parameter.

Type of service

It specifies the Type of Service (ToS). This is the Internet service's quality selection. The default is 0.

Set DF bit in IP header?

We must specify whether or not the Don't Fragment (DF) bit will be set on the ping packet sent. If yes is entered, the Don't Fragment option does not allow this packet to be fragmented. The default is set to no.

Validate reply data?

We must specify whether or not to validate the reply data. The default is set to no.

Data pattern

We must specify the data pattern. Data patterns are used to troubleshoot framing errors and clocking problems on serial lines.

Sweep range of sizes

We must specify the sizes of the ping echo packets that are sent. This parameter is used to determine the minimum sizes of the MTUs configured on the nodes sent along the path to the destination address. The default is set to no.

The configuration for modification of parameters is also shown below with an image.
PicsArt_04-20-10.59.26.jpg