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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The two CBR agents have to be connected to the Null agent. See Chapter 15 of ns documentation for details on wireless trace. MovementTrace, when turned on, shows the movement of the mobilenodes and the trace is marked with M in their 2nd field.

IX. Running Wireless Simulations in ns

The array used to define these variables, val is not global as it used to be in the earlier wireless scripts. We shall make changes to the script, simple-wireless.

The nodes start out initially at two opposite ends of the boundary. Also we are going to set up nam traces. When you click on the ‘play’ button in the nam window, you will see that after 0. How to start Now we are going to write a ‘template’ that you can use for all of the first Tcl scripts. I suggest that you call this first example ‘example1. The last line finally starts the simulation. Save the file wireless1.


In addition to the evaluation functionalities, the God object is called internally by MAC objects in mobilenodes. The packetSize is being set to bytes and a packet will be sent every 0. For details and available optional values of these variables, see chapter 15 mobile networking in ns of ns documentation. Next add the following lines for providing initial position of nodes in nam. The next step is to add a ‘finish’ procedure that closes the trace file and starts nam.

Both setdest and calcdest calculate the shortest number of hops between nodes based on the nominal radio range, ignoring any effects that might be introduced by the propagation model in an actual simulation. See comments in the code below for a brief description of each variable defined. The above code creates two nodes and assigns them to the handles ‘n0’ greiw ‘n1’.

As before, the mobilenodes move within the boundaries of grdis defined topology. The next hop gutorial is normally loaded into god object from movement pattern files, before simulation begins, since calculating this on the fly during simulation runs can be quite time consuming. More about this is discussed in section XI.

So please download the daily snapshot unless a release is made for version ns2. For details on CMUTraces see chapter 15 of ns documentation.

Download the daily snapshot version if the next release 2. If you want to download a copy of simple-wireless. So even though we may not utilise God for evaluation purposes, as in this example we still need to create God.

Random CBR and TCP flows are setup between the 3 mobilenodes and data packets are sent, forwarded or received tutoriak nodes within hearing range of one another.


Just as with any other ns simulation, we begin by creating a tcl script for the wireless simulation. If not, I suggest you either go to the web page for the VINT project or the web page for ns version 2. Now you can save the file and start the simulation again. Line 7 and 8 should be self-explaining. Everything else depends on the Tcl script. We see TCP flow starting at Thus all pkts destined for nodes 0 gteis 2 are routed through node 1.

The mobilenodes move about within an area whose boundary is defined in this example as mXm.

For a copy of wireless1. However, in order to keep this example simple we avoid using movement pattern files and thus do not provide Futorial with next hop information. If ad-hockey can read your input correctly, its output will be properly formatted for calcdest.

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

On the way there, I will also show you how to use traffic generators. And finally the command to start the simulation, puts “Starting Simulation Packets are exchanged between the nodes as they come within hearing range of one another. You can download the full example here. At the beginning of a wireless simulation, we need to define the hreis for each of these network components.