# /*
# * This program is free software; you can redistribute it and/or modify
# * it under the terms of the GNU General Public License version 2 as
# * published by the Free Software Foundation
# *
# * This program is distributed in the hope that it will be useful,
# * but WITHOUT ANY WARRANTY; without even the implied warranty of
# * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# * GNU General Public License for more details.
# *
# * You should have received a copy of the GNU General Public License
# * along with this program; if not, write to the Free Software
# * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
# */
# Network topology
#
# n0 n1
# | |
# ----------
# | Switch |
# ----------
# | |
# n2 n3
#
#
# - CBR/UDP flows from n0 to n1 and from n3 to n0
# - DropTail queues
# - Tracing of queues and packet receptions to file "csma-bridge.tr"
import ns3
def main(argv):
#
# Make the random number generators generate reproducible results.
#
ns3.RandomVariable.UseGlobalSeed(1, 1, 2, 3, 5, 8)
#
# Allow the user to override any of the defaults and the above Bind() at
# run-time, via command-line arguments
#
cmd = ns3.CommandLine()
cmd.Parse(argv)
#
# Explicitly create the nodes required by the topology(shown above).
#
#print "Create nodes."
terminals = ns3.NodeContainer()
terminals.Create(4)
csmaSwitch = ns3.NodeContainer()
csmaSwitch.Create(1)
#print "Build Topology"
csma = ns3.CsmaHelper()
csma.SetChannelAttribute("DataRate", ns3.DataRateValue(ns3.DataRate(5000000)))
csma.SetChannelAttribute("Delay", ns3.TimeValue(ns3.MilliSeconds(2)))
# Create the csma links, from each terminal to the switch
terminalDevices = ns3.NetDeviceContainer()
switchDevices = ns3.NetDeviceContainer()
for i in range(4):
link = csma.Install(ns3.NodeContainer(ns3.NodeContainer(terminals.Get(i)), csmaSwitch))
terminalDevices.Add(link.Get(0))
switchDevices.Add(link.Get(1))
# Create the bridge netdevice, which will do the packet switching
switchNode = csmaSwitch.Get(0)
bridgeDevice = ns3.BridgeNetDevice()
switchNode.AddDevice(bridgeDevice)
for portIter in range(switchDevices.GetN()):
bridgeDevice.AddBridgePort(switchDevices.Get(portIter))
# Add internet stack to the terminals
internet = ns3.InternetStackHelper()
internet.Install(terminals)
# We've got the "hardware" in place. Now we need to add IP addresses.
#
#print "Assign IP Addresses."
ipv4 = ns3.Ipv4AddressHelper()
ipv4.SetBase(ns3.Ipv4Address("10.1.1.0"), ns3.Ipv4Mask("255.255.255.0"))
ipv4.Assign(terminalDevices)
#
# Create an OnOff application to send UDP datagrams from node zero to node 1.
#
#print "Create Applications."
port = 9 # Discard port(RFC 863)
onoff = ns3.OnOffHelper("ns3::UdpSocketFactory",
ns3.Address(ns3.InetSocketAddress(ns3.Ipv4Address("10.1.1.2"), port)))
onoff.SetAttribute("OnTime", ns3.RandomVariableValue(ns3.ConstantVariable(1)))
onoff.SetAttribute("OffTime", ns3.RandomVariableValue(ns3.ConstantVariable(0)))
app = onoff.Install(ns3.NodeContainer(terminals.Get(0)))
# Start the application
app.Start(ns3.Seconds(1.0))
app.Stop(ns3.Seconds(10.0))
# Create an optional packet sink to receive these packets
sink = ns3.PacketSinkHelper("ns3::UdpSocketFactory",
ns3.Address(ns3.InetSocketAddress(ns3.Ipv4Address.GetAny(), port)))
app = sink.Install(ns3.NodeContainer(terminals.Get(1)))
app.Start (ns3.Seconds (0.0))
#
# Create a similar flow from n3 to n0, starting at time 1.1 seconds
#
onoff.SetAttribute("Remote",
ns3.AddressValue(ns3.InetSocketAddress(ns3.Ipv4Address("10.1.1.1"), port)))
app = onoff.Install(ns3.NodeContainer(terminals.Get(3)))
app.Start(ns3.Seconds(1.1))
app.Stop(ns3.Seconds(10.0))
app = sink.Install(ns3.NodeContainer(terminals.Get(0)))
app.Start (ns3.Seconds (0.0))
#
# Configure tracing of all enqueue, dequeue, and NetDevice receive events.
# Trace output will be sent to the file "csma-bridge.tr"
#
#print "Configure Tracing."
#std.ofstream ascii
#ascii.open("csma-bridge.tr")
#CsmaHelper.EnableAsciiAll(ascii)
#
# Also configure some tcpdump traces; each interface will be traced.
# The output files will be named:
# csma-bridge.pcap-<nodeId>-<interfaceId>
# and can be read by the "tcpdump -r" command(use "-tt" option to
# display timestamps correctly)
#
ns3.CsmaHelper.EnablePcapAll("csma-bridge")
#
# Now, do the actual simulation.
#
#print "Run Simulation."
ns3.Simulator.Run()
ns3.Simulator.Destroy()
#print "Done."
if __name__ == '__main__':
import sys
main(sys.argv)