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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More about this is discussed in section XI. If not, I suggest you either go to the web page for the VINT project or the web page for ns version 2. However, in order to keep this example simple we avoid using movement pattern files and thus do not provide God tutlrial next hop information. Note that all wireless traces starts with WL in their first field. You can save and start the script now. At the beginning of a wireless simulation, we need to define the type for each of these network components.
IX. Running Wireless Simulations in ns
It will get clearer to you once you see what the code does. In ns, data is always being sent from one ‘agent’ to another. For details and available optional values of these variables, see chapter 15 mobile grei in ns of ns documentation.
In order to download a copy of the file click here. Line 7 and 8 should be self-explaining. See cbrtest to find out more about the traffic flows that are setup.
As an extension to the previous sub-sectionwe are going to simulate a simple multihop wireless scenario consisting of 3 mobilenodes grsis.
Also we are going to set up nam traces. You are going to get an error message like ‘nam: In this section, you are going to develop a Tcl script for ns which simulates a simple topology. The next lines create a Null agent which acts as traffic sink and attach it to node n1. So the next step is to create an agent object that sends data from node n0, and another agent object that receives the data on node n1.
The new Treis are not available with ns2. You can find the relevant parameters for each agent type in the ns manual page. If you want to download a tuutorial of simple-wireless. Now tutoiral two agents have to be connected with each other.
Make sure the connection-pattern and node-movement files exist under the directories as declared above. For details on CMUTraces see chapter 15 of ns documentation. 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.
Download the daily snapshot version if the next release 2.
Marc Greis’ Tutorial for the UCB/LBNL/VINT Network Simulator “ns”
Save the file wireless1. 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. First, we need to configure nodes before we can create them.
You can find the relevant parameters for each agent type in the ns manual page. As they move away, packets start getting dropped.
IV. The first Tcl script
titorial 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. 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. You can click on any packet in the nam window to monitor it, and you can also click directly on the link to get some graphs with statistics.
Random node movement files like scentest can be generated using CMU’s node-movement generator “setdest”. Save the file simple-wireless.
The nodes start out initially at two opposite ends of the boundary. First of all, you need to tutoril a simulator object. We are going to use the default value of flat addressing; Also lets turn on only AgentTrace and RouterTrace; You can experiment with the traces by turning all of them on.