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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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For a copy of wireless1.

As an extension to the previous sub-sectionwe are going to simulate a simple multihop wireless scenario consisting of 3 mobilenodes here. Then they move towards each other in the first half of the simulation and again move away for the second half. However the node movements for this example shall be read from a node-movement file called scentest.

Two nodes, one link In this yreis we are going to define a very simple topology with two nodes that are connected maec a link. Packets are exchanged between the nodes as they come within hearing range of one another.

The configuration API for creating mobilenodes looks as follows: If you want to download a copy of simple-wireless. You can find the relevant parameters for each agent type in the ns manual page.


Run the script by typing at the prompt: 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.

The topography is broken up into grids and the default value of grid resolution is 1. We tutoril our script simple-wireless.

The packetSize is being set to bytes and a packet will be sent every 0. Line 7 and 8 should be self-explaining.


There are better sources for that which I am going to list in Section II. A note concerning the ns-allinone version 2. Also we are going to set up nam traces. If you have any suggestions, find any bugs or problems, have any comments and also if you have any new well-documented examples that could be added here, please send email to ns-users mailing list.

For details on CMUTraces see chapter 15 of ns documentation. This API is used to change direction and speed of movement of the mobilenodes. Save the file simple-wireless.

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

Grwis shall make changes to the script, simple-wireless. Now the two agents have to be connected with each other. So even though we may not utilise God for evaluation tutoial, as in this example we still need to create God.


If calcdest rejects a movement pattern file you have created, the easiest way to format it properly is often to load it into ad-hockey and then save it out again. At the beginning of a wireless simulation, we need to define the type for each of these network components.

In this section, tutorrial are going to learn to use the mobile wireless simulation model available in ns. Next we create the 2 mobilenodes as follows: Pkts start getting dropped as the nodes move away from one another.

Note that all wireless traces starts with WL in their first field. In the second line we tell the simulator object that we created above to write all simulation data that is going to be relevant for nam into this file.

IV. The first Tcl script

Characterizing the rate of topology change in a movement pattern. The above code creates two nodes and assigns them to the handles ‘n0’ and ‘n1’. Additionally, we need to define other parameters like the type of antenna, the radio-propagation model, the type of ad-hoc routing protocol used by mobilenodes etc.