Dynamic Topology Configuration Ĭommand-line arguments can be also used to configure the network topology as in the case of. Implement the nPackets variable.Ĭheck that you can successfully run the command below: Read and perform the actions described in Section 5.2 of the ns-3 tutorial to learn how to work with command-line arguments. To see how they can be used in ns-3, we will briefly return to the example. time the execution of the simulation with and without enabled checksums by using the Linux time commandĬommand-line arguments are an important tool for configuring any simulation scenario and we will be using them extensively in the next labs.extend the simulation time and number of generated packets in.Perform an analysis of how much time the simulator spends on calculating and validating checksums: Verify that after adding this code the checksum calculations are enabled in ns-3 and that Wireshark no longer raises an error. This default behavior can be changed by adding the following line to your code: GlobalValue::Bind ("ChecksumEnabled", BooleanValue (true)) Recall, from the previous exercise set, that ns-3 by default does not calculate the checksum values which generates errors in Wireshark. Suggestion: disable logging to speed up the simulation. Is there a difference between the configured data rates of the channel in the network and the achieved throughput? Why? Provide verification for your observations (e.g., screenshots) and relevant fragments of the simulation code. Measure the average throughput (e.g., using Wireshark) between the first and last node in the network.at a rate (offered load) of more than 5 Mb/s,.Network Performance Ĭonfigure the UDP Echo application to generate traffic pcap file contains an ARP exchange? Why? Task 2. pcap files do you need to open to observe how the packet flows through the network? Which. pcap tracing enabled in the CSMA network? Why do we need to use promiscuous mode (which was not needed in the point-to-point network)?Ĭompile and run the script by executing the following commands from the ns-3.x working directory: cp examples/tutorial/ scratch/ How is routing in this simulation script achieved? How does this method of implementing routing relate to the system vs. How is this achieved in the example using the nCsma parameter? A Bus Network Topology īased on the code of examples/tutorial/ and Section 6.1 of the ns-3 tutorial answer the following questions.Ī key advantage of the simulation method over experiments in real networks is its flexibility.
However, you may want to use the HTML version if you wish. Throughout this instruction the PDF version of the ns-3 tutorial is referenced because it contains numbered sections. We'll also review some basic networking principles.
In this problem set you will run more complex network simulations in ns-3 and look at examples of how the operation of a network is modelled in the simulator.
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