112 lines
3.2 KiB
Python
112 lines
3.2 KiB
Python
#
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# * This program is free software; you can redistribute it and/or modify
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# * it under the terms of the GNU General Public License version 2 as
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# * published by the Free Software Foundation;
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# *
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# * This program is distributed in the hope that it will be useful,
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# * but WITHOUT ANY WARRANTY; without even the implied warranty of
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# * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# * GNU General Public License for more details.
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# *
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# * You should have received a copy of the GNU General Public License
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# * along with this program; if not, write to the Free Software
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# * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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# Network topology
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#
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# n0 n1 n2 n3
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# | | | |
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# =================
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# LAN
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#
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# - UDP flows from n0 to n1 and back
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# - DropTail queues
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# - Tracing of queues and packet receptions to file "udp-echo.tr"
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import ns3
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def main(argv):
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#
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# Allow the user to override any of the defaults and the above Bind() at
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# run-time, via command-line arguments
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#
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cmd = ns3.CommandLine()
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cmd.Parse(argv)
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#
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# But since this is a realtime script, don't allow the user to mess with
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# that.
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#
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ns3.GlobalValue.Bind("SimulatorImplementationType", ns3.StringValue("ns3::RealtimeSimulatorImpl"))
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#
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# Explicitly create the nodes required by the topology (shown above).
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#
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print "Create nodes."
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n = ns3.NodeContainer()
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n.Create(4)
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internet = ns3.InternetStackHelper()
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internet.Install(n)
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#
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# Explicitly create the channels required by the topology (shown above).
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#
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print ("Create channels.")
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csma = ns3.CsmaHelper()
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csma.SetChannelAttribute("DataRate", ns3.DataRateValue(ns3.DataRate(5000000)))
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csma.SetChannelAttribute("Delay", ns3.TimeValue(ns3.MilliSeconds(2)));
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csma.SetDeviceAttribute("Mtu", ns3.UintegerValue(1400))
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d = csma.Install(n)
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#
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# We've got the "hardware" in place. Now we need to add IP addresses.
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#
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print ("Assign IP Addresses.")
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ipv4 = ns3.Ipv4AddressHelper()
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ipv4.SetBase(ns3.Ipv4Address("10.1.1.0"), ns3.Ipv4Mask("255.255.255.0"))
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i = ipv4.Assign(d)
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print ("Create Applications.")
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#
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# Create a UdpEchoServer application on node one.
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#
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port = 9 # well-known echo port number
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server = ns3.UdpEchoServerHelper(port)
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apps = server.Install(n.Get(1))
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apps.Start(ns3.Seconds(1.0))
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apps.Stop(ns3.Seconds(10.0))
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#
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# Create a UdpEchoClient application to send UDP datagrams from node zero to
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# node one.
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#
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packetSize = 1024
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maxPacketCount = 500
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interPacketInterval = ns3.Seconds(0.01)
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client = ns3.UdpEchoClientHelper(i.GetAddress (1), port)
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client.SetAttribute("MaxPackets", ns3.UintegerValue(maxPacketCount))
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client.SetAttribute("Interval", ns3.TimeValue(interPacketInterval))
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client.SetAttribute("PacketSize", ns3.UintegerValue(packetSize))
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apps = client.Install(n.Get(0))
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apps.Start(ns3.Seconds(2.0))
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apps.Stop(ns3.Seconds(10.0))
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ascii = ns3.AsciiTraceHelper()
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csma.EnableAsciiAll(ascii.CreateFileStream("realtime-udp-echo.tr"))
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csma.EnablePcapAll("realtime-udp-echo", False)
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#
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# Now, do the actual simulation.
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#
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print ("Run Simulation.")
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ns3.Simulator.Run()
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ns3.Simulator.Destroy()
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print ("Done.")
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if __name__ == '__main__':
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import sys
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main(sys.argv)
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