Marc Greis’ ns Tutorial Contents: I. Introduction II. Finding Documentation II For ns&nam II.2 For Tcl II.3 For C++ III. The Basics III.1 Downloading/ Installing. Only the first 94 pages are relevant for Tcl, the rest of the book is about Tk and more complicated aspects of Tcl. I also found a short OTcl Tutorial. Another good . Marc Greis’ Tutorial for the UCB/LBNL/VINT Network Simulator “ns”. I. Introduction [Next section] [Back to the index] Disclaimer: This tutorial was originally.

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Line 7 and 8 should be self-explaining. Also we are going to set up nam traces. However note that only node movements can currently be seen in nam. Next we create the object God, as follows: The two CBR agents have to be connected to the Null agent.

When you click on the ‘play’ button in the nam window, you will see that after tutodial. The nodes start out initially at two opposite ends of the boundary. You are going to get an error message like ‘nam: We see TCP flow starting at Or all of the above.


The configuration API can be defined as follows: So the next step is to create an agent object that sends data from node n0, and another agent object that receives the data on node n1. We begin our script simple-wireless. The path length information provided to god was used by CMU’s Monarch Project to analyze the path length optimality of ad hoc network routing protocols, and so was printed out as part of the CMUTrace output for each packet.

The current snapshot version is updated daily, so please check the validation results for that day before downloading, as these snapshots can sometimes be unstable due to ongoing changes made by ns-developers.

Just as with any other ns simulation, we begin by creating a tcl script for the wireless simulation. Random CBR and TCP flows are setup between the 3 mobilenodes and data packets are sent, forwarded or received by nodes within hearing range of one another.


Details on generation of node movement files are covered in section XI. We begin our script simple-wireless. For details and available optional values of these variables, see chapter 15 mobile networking in ns of ns documentation. Now we open a file for writing that is going to be used for the nam trace grreis.

Marc Greis’ Tutorial for the UCB/LBNL/VINT Network Simulator “ns”

You can save and start the script now. The packetSize is being set to bytes and a packet will be sent every 0. However, in order to keep this example simple we avoid using movement pattern files and thus do not provide God with next hop information. And gresi the command to start the simulation, puts “Starting Simulation You will have to use the code from this section as starting point in the other sections.

IV. The first Tcl script

For a copy of wireless1. Characterizing the rate of topology change in a movement pattern. If not, I suggest you either go to the web page for the VINT project or the web page for ns version 2.

A note concerning the ns-allinone version 2. You might want to slow nam down then with the ‘Step’ slider. Save the file wireless1. In this section, you are going to learn tutrial use the mobile wireless simulation model available in ns. Node1 is in range with nodes 0 and 2 and can communicate with both rgeis them. The nominal range is either provided as an argument to the programs, or extracted from the header in node-movement pattern files.

Other uses that CMU has found for the information are: Two nodes, one link In this section we are going to define a very simple topology with two nodes that are connected by a link. You are going to learn how to set up nodes and links, how to send data from one node to another, how to monitor a queue and how to start nam from your simulation script to visualize your simulation.


A node, a previously created traffic sink, the packet size for the traffic source, the burst and idle times for the exponential distribution and the peak rate.

Now you can save the file and start the simulation again. You can write your Tcl scripts in any text editor like joe or emacs. Download the daily snapshot version tutorrial the next release 2. Line 7 and 8 should be self-explaining. They are listed as follows: The above code creates two nodes and assigns them to the handles ‘n0’ and ‘n1’. I suggest that now you start some experiments with nam and the Tcl script.

Then they move towards each other in the first half of the simulation and again move away for the second half. As they move away, packets start getting dropped. The setdest program see section XI.

IX. Running Wireless Simulations in ns

Additionally, we need to define other parameters like the gries of antenna, the radio-propagation model, the type of ad-hoc routing protocol used by mobilenodes etc. Identifying the frequency and size of geis. Pkts start getting dropped as the nodes move away from one another. More about this is discussed in section XI. The node-movement files generated using setdest like scentest already include lines like above to load the god object with the appropriate information at the appropriate time.

First of all, you need to create a simulator object. The next line connects the two nodes. In ns, data is always being tutorila from one ‘agent’ to another.

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