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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I suggest that now you start some experiments with nam and the Tcl script. Medias this blog was made to help people to easily download or read PDF files. Random node movement files like scentest can be generated using CMU’s node-movement generator “setdest”.

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 Tutoorial output for each packet. Tutoeial nodes start out initially at two opposite ends of the boundary. As they move away, packets start getting dropped.

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 by nodes within hearing range of one another.


Next, we create mobilenodes. 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 time consuming. You can actually save the file now and try to run it with ‘ns example1.

II. Finding Documentation

This is done with the command set ns [new Simulator]. 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.

For details on CMUTraces see chapter 15 of ns documentation. Add the next three lines to your Tcl script and start it again.


The next step is to add a ‘finish’ procedure that closes the trace file and starts nam. First, we need to configure nodes before we can create them. Initially both the nodes are far apart and thus TCP pkts are dropped by node0 as it cannot hear from node1. The next lines create a Null agent which acts as traffic sink and attach it to node n1. Now you can save the file and start the simulation again.

We will call this file simple-wireless. However, in order to keep this example simple we avoid using movement pattern files and thus do not provide God with next hop information.

IX. Running Wireless Simulations in ns

However note that only node movements can currently be seen in nam. If you want to download a copy of gres. Or all of the above. Creating Output Files for Xgraph. See comments in the code below for a brief description of each variable defined. In the first subsection, we discuss how to create and run a simple 2-node wireless network simulation.


In this section, you are going to learn to use the mobile wireless simulation model available in ns. The topography is broken up into gteis and the default value of grid resolution is 1. The array used to define these variables, val is not global as it used to be in the earlier wireless scripts. Now the two agents have to be connected with each other.

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 the beginning after the simulator object has been created, since this grwis a part of the simulator setup. Next we create the 2 mobilenodes as follows: The next lines create a Null agent which acts as traffic sink and attach it to node n1.