d9/d1c/tap-csma-virtual-machine_8py_source.html

# -*-  Mode: Python; -*-

#

# Copyright 2010 University of Washington

#

# SPDX-License-Identifier: GPL-2.0-only

#


import sys


try:

    from ns import ns

except ModuleNotFoundError:

    raise SystemExit(

        "Error: ns3 Python module not found;"

        " Python bindings may not be enabled"

        " or your PYTHONPATH might not be properly configured"

    )


def main(argv):

    ns.CommandLine().Parse(argv)


    #

    # We are interacting with the outside, real, world.  This means we have to

    # interact in real-time and therefore we have to use the real-time simulator

    # and take the time to calculate checksums.

    #

    ns.GlobalValue.Bind("SimulatorImplementationType", ns.StringValue("ns3::RealtimeSimulatorImpl"))

    ns.GlobalValue.Bind("ChecksumEnabled", ns.BooleanValue(True))


    #

    # Create two ghost nodes.  The first will represent the virtual machine host

    # on the left side of the network; and the second will represent the VM on

    # the right side.

    #

    nodes = ns.NodeContainer()

    nodes.Create(2)


    #

    # Use a CsmaHelper to get a CSMA channel created, and the needed net

    # devices installed on both of the nodes.  The data rate and delay for the

    # channel can be set through the command-line parser.

    #

    csma = ns.CsmaHelper()

    devices = csma.Install(nodes)


    #

    # Use the TapBridgeHelper to connect to the pre-configured tap devices for

    # the left side.  We go with "UseLocal" mode since the wifi devices do not

    # support promiscuous mode (because of their natures0.  This is a special

    # case mode that allows us to extend a linux bridge into ns-3 IFF we will

    # only see traffic from one other device on that bridge.  That is the case

    # for this configuration.

    #

    tapBridge = ns.TapBridgeHelper()

    tapBridge.SetAttribute("Mode", ns.StringValue("UseLocal"))

    tapBridge.SetAttribute("DeviceName", ns.StringValue("tap-left"))

    tapBridge.Install(nodes.Get(0), devices.Get(0))


    #

    # Connect the right side tap to the right side wifi device on the right-side

    # ghost node.

    #

    tapBridge.SetAttribute("DeviceName", ns.StringValue("tap-right"))

    tapBridge.Install(nodes.Get(1), devices.Get(1))


    #

    # Run the simulation for ten minutes to give the user time to play around

    #

    ns.Simulator.Stop(ns.Seconds(600))

    ns.Simulator.Run()  # signal_check_frequency = -1

    ns.Simulator.Destroy()

    return 0


if __name__ == "__main__":

    sys.exit(main(sys.argv))