How to simulate realistic TCP traffic in OMNeT++?

[Tushar Mathur]

I want to simulate TCP traffic between a source and destination pair, using OMNeT++, such that:

1. 1. there is a periodic transmission of a 2GB file (every 1.5-2.0 second, as allowed by automatic TCP congestion mechanism)

2. 2. the traffic being simulated must be permitted to grow with the TCP congestion window dominating its bit-rate. The maximum bit-rate must be limited by the link bandwidth

3. 3. as soon as the file is completely transmitted, automatically restart the transmission of next 2GB file

4. 4. calculate average bandwidth consumption on the link

Is there any module or feature which supports this functionality?

I have tried to use NS3 for this scenario but it did not have a method to automatically restart the application once the first transmission is completed.

Just to be clear, I haven't used OMNeT++ before.

I would appreciate it if  some expert can answer this problem.

Thanks,

-Tushar

[David van Wyk]

Hi Tushar,

I don't know if you have looked at it yet, but your best bet for accomplishing this will probably be with something like the INET (https://inet.omnetpp.org/) framework. That's at least a good place to start.

https://omnetpp.org/doc/inet/api-current/neddoc/index.html for the model documentation.

I would also suggest running through the INET manual as this gives a good overview of the congestion control and how to use it.

Note, I'm no expert at OMNET, just busy working on vaguely the same type of problem, and INET is doing the trick for me.

Regards

David

Edit: https://www.youtube.com/watch?v=-U95qOpYsLQ is a really nice YoutTube video to get you started in INET with TCP. 

https://www.youtube.com/watch?v=m2n5vZQ4030&spfreload=1 is a good example of how the congestion window works.

note: in these examples an older version of INET and OMNET are being used, so just recheck the syntaxes in the documentation.

[Tushar Mathur]

Hey David,

Thanks for the pointers. How are you achieving the periodic bursts of TCP traffic generation? Is there a traffic generation application.

I knew INET framework would be a suitable framework for this problem from the literature search I did earlier.

All the information you shared is helpful. Thanks. 

Thanks for the help!

-Tushar

[David van Wyk]

While I haven't looked at burst transmission in detail yet, I would assume that the sendScript parameter of the TCP session app would be able to do that.

[Tushar Mathur]

Thanks, David!

[chitsu...@gmail.com]

I'm also a beginner of OMNeT++

Do u see

In INET framework > inet/example/inet/TCPclientserver.ned

open it and then change parameters.

[Mathur, Tushar]

Depends on what you want to do. I found out a lot of examples on TCP. There are few different TCP applications which you can use.

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