example network with inet3

1/1/2015

Example network with INET3.0 OMNET++ Workshop

Mohamed Elshaikh SCHOOL OF COMPUTER AND COMMUNICATION ENGINEERING,

UNIMAP

Objectives INET 3.0

INET examples

Experiment design

Results planning

INET3.0

In the following ex. We will import the inet3.0 to omnet++, and have an overview on the

examples and file structure of INET3.0. Later we collect results for a specific design aims

and goals.

Importing the INET3.0

Extract the inet3.0 file into your preferred directory.

In omnet++ from the file->import

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6 Now build it (ctrl+b) it takes time be patient

Inet structure

Inet3.0 is organized into folders listing some:

Src: in this folder we can find all protocols implementation and source files (.cc), beside

the basic and abstract components

Examples: in this folder there are plenty of examples for the implemented protocols

(remember its an open source don’t expect perfection)

Tutorial: some tutorial newly added to inet frame work (expected to grow in the coming

versions of inet)

Example network with Inet

This example aims at bringing some light on the traffic generation modules in inet.

Inet3.0 comes with well-organized traffic application modules that implements standard

application protocols (UDP, TCP, Video and Audio streaming, ping application and

more).

Scenario: a network composed of number of hosts connected with bus, all hosts in the

network are to send a traffic (with random distribution behavior) to a server. The server

responds to all hosts request. Investigate the performance of this network in respect to

number of host and packet size.

Solution steps:

Step 1: create the network:

Under the example folder create a new folder (Ex1), and create a network description

file for the network and name it ex1_net.ned

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Step 2: add network components

From the palette in the right side add the following components (see figure below):

2 etherhost modules (server , host[n_hosts])

1 etherbus module (link)

Connect both host and server modules to the link(bus module)

Step 3: add configurations to the network

Shift to source tab and change the code as following:

1. We add a parameters section to declare the number of host as a parameters

that could be changed from the ini file

2. In the EtherBus submodule we declare the propagation speed of the link

3. And we change the connection section to cop with variability in number of

hosts.

Step 4:

Create new ini file for the just created network

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6 Add values to omnetpp.ini file as:

The ini file:

Planning the experiment:

To investigate the performances of this network we need to know what the

performances parameters are. In this example let’s go for throughput, end-to-end

delay and packet delivery ratio (PDR).

Throughput: successful amount of data received / time unit

End-to-end delay: the average delay on the application layer

PDR: number of packets received / number of packets sent

However we are investigating in respect to number of hosts and packet size (control

parameters)

network = inet.examples.Ex.Ex1_net **.n_hosts = 10 **.server.cli.destAddress = "" **.startTime= 1s **.host[*].cli.destAddress = "server" **.host[*].cli.sendInterval = 0.1s **.cli.reqLength= 100B

The following table details our experiments:

Packet size experiments:

Pkt size (bytes) 500 600 700 800 900 1000

Delay

Throughput

PDR

Number of hosts experiments:

# hosts 5 10 15 20 25

Delay

Throughput

PDR

Now it is time to run and collect some results.

example network with inet3

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