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 details and available optional values of these variables, see chapter 15 mobile networking in ns of ns documentation. Note that all wireless traces starts with WL in their first field. Now you can save your file greie start the script with ‘ns example1. The packetSize is being set to bytes and a packet will be sent every 0.

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. We begin our script simple-wireless. 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.

When you click on the ‘play’ button in the nam window, tutirial will see that after 0. In ns, data is always being sent from one ‘agent’ to another. The configuration API for creating mobilenodes looks as follows: By providing this information, the calculation tutorizl shortest distance between nodes by the god object during simulation runs, which can be quite time-consuming, is prevented.

From the CMUTrace output we find nodes 0 and 2 are out of range and so cannot hear one another. For a copy of wireless1.

IX. Running Wireless Simulations in ns

Line 7 and 8 should be self-explaining. The two CBR agents have to be connected treis the Null agent. We are going to simulate a very simple 2-node wireless scenario. 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.


A note concerning the ns-allinone version 2. The array used to define these variables, val is not global as it used to be in the earlier wireless scripts.

II. Finding Documentation

Now the two agents have to be connected with each other. The topography is broken up into grids and the default value of grid resolution is 1. The nodes start out initially at two opposite ends of the boundary. You are going to get an error message like ‘nam: Then they move towards each other in the first half of the simulation and again move away for the second half.

The packetSize is being set to bytes and a packet will be sent every 0.

The next line connects the two nodes. If you want to download a copy of simple-wireless. The configuration API can be defined as follows: You can download the full example here. In addition to the variables LL, MAC, antenna etc that were declared at the beginning of the script, we now define some more parameters like the connection-pattern and node-movement file, x and y values for the topology boundary, a seed value for the random-number generator, time for the simulation to stop, for convinience.

Next setup traffic flow between the two nodes as follows: The next hop information 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. 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.

There are better sources for that which I am going to list in Section II. Define node movement model puts “Loading connection pattern I suggest that you call this first example ‘example1. At the end of the simulation run, trace-output file simple.


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

Identifying the frequency and size of partitions. You will have to use the code from this section as starting point in the other sections. In second subsection, we will extend our example in subsection 1 to create a relatively more complex wireless scenario.

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

In addition to node-movements, traffic flows that are setup between the mobilenodes, are also read from a traffic-pattern file called cbrtest. Thus all pkts destined for nodes 0 and 2 are routed through node 1. 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. The purpose of these 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.

So please download the daily snapshot unless a release is made for version ns2.

Run the script by typing at the prompt: Next we create the object God, as follows: And now we have to tell the CBR agent when to send data and when to stop sending. The usage of movement pattern files and feeding of next hop info to God shall be shown in the example in the next sub-section.