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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Creating Output Files for Xgraph. There are better sources for that which I am going to list in Section II. For details on CMUTraces see chapter 15 of ns documentation.

Make sure the connection-pattern and node-movement files exist under geris directories as declared above. 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.

As they move away, packets start getting dropped. We begin our script simple-wireless. Also we are going to set up nam traces.

Packets are exchanged between the nodes as they come within hearing range of one another. I suggest that now you start some experiments with nam and the Tcl script. Next setup traffic flow between the two nodes as follows: For a copy of wireless1.

The array used to define these variables, val is not global as it used to be in the earlier wireless scripts. However, in order to keep this example simple we avoid using movement pattern files and thus do not provide God with next tutoriaal information.


If you want to download a copy of simple-wireless. A note concerning the ns-allinone version 2. The mobilenodes move about within an area whose boundary is defined in this example as mXm. Two nodes, one link In this section we are going to define a very simple topology with two nodes that are connected maec a link. By providing this information, the calculation of shortest distance between nodes by the god object during simulation runs, which can be quite time-consuming, is prevented.

I will explain find a way to distinguish the data flows from the two nodes from greiss other, and I will show how a queue can be monitored to see how full it is, and how many packets are being discarded.

The next lines create a Null agent which acts as traffic sink and attach it to node n1. Then they move towards each other in the first half of the simulation and again move away for the second half. Download the daily snapshot version if the next release 2.

The nominal range is either provided as an argument to the programs, or extracted from the header in node-movement pattern files.

Everything else depends on the Tcl script. If you have any suggestions, find any bugs or problems, have any comments and also if you have any breis well-documented examples that could be added here, please send email to ns-users mailing list.

greus Add the next three lines to your Tcl script and start it again. If not, I suggest you either go to the web page for the VINT project or the web page for ns version 2.

IX. Running Wireless Simulations in ns

You can find the relevant parameters for each agent type in the ns manual page. You can save and start the script now. On the way there, I will also show you how to use traffic generators.


The packetSize is being set to bytes and a packet will be sent every 0. The two CBR agents have to be connected to the Null agent.

First of all, you need to create a simulator object. The configuration API for creating mobilenodes looks as follows: However as node1 starts to move away from node0, the connection breaks down again around time Now add the following piece of code to your Tcl script, preferably tutoiral gris beginning after the simulator object has been created, since this is a part of the simulator setup.

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

The next hop information is normally loaded into god object from movement pattern files, before tutoria begins, since calculating this on the fly during simulation runs can be quite grei consuming. Or all of the above. The purpose of gfeis pages is to make it easier for new ns users to use ns and nam, to create their own simulation scenarios for these tools and to eventually add new functionality to ns.

Line 7 and 8 should be self-explaining. Medias this blog was made to help people to easily download or read PDF files.