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Makefile Normal file
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all: dumbbell-sim
dumbbell-sim: dumbbell-sim.cc
g++ -I/usr/include/ns3.17 -lns3.17-applications -lns3.17-internet -lns3.17-network -lns3.17-core -lns3.17-point-to-point -Wall dumbbell-sim.cc -o dumbbell-sim

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Simulation of a dumbbell topology using ns3 3.17
------------------------------------------------
dependencies (on Debian based distros):
libns3-dev (= 3.17)
compilation:
make
example execution:
$ cat << END | ./dumbbell-sim > log
UR TCP 536 0.0 1250
UR TCP 536 250 500
LR UDP 1000 750 1000 0.9Mbps
END
The file `log` then contains traces with the first column being the timestamp,
the second column being the ns3 context and the third column being the traced
value of this context. The traced values are TCP congestion window size
changes, received packets and queue drops.
The traffic description is done via standard input. Each line represents one
flow and the dumbbell will be created such that it has as many clients on each
side as there are flows. Each flow will originate from a unique node N on the
left side of the dumbbell and reach node N on the right side of the dumbbell.
This way, every node is involved in exactly one flow and the connection in the
center of the dumbbell serves as the bottleneck.
So above example would create the following topology:
L1 R1
\ /
\+--+ +--+/
L2---|LR|----|RR|---R2
/+--+ +--|\
/ \
L3 R3
The flow given in the first line would originate from `L1`, go through the
bottleneck link between the left and right router (`LR` and `RR`, respectively)
and end at `R1`. The flow given in the second line would go from `L2` to `R2`
and the last one from `L3` to `R3`.
Flow description format
-----------------------
Each line represents one flow between two unique nodes of the dumbbell, flowing
from left to right. Each line is split by their white spaces. The first element
represents the type of flow. There are three flow types.
**LR**: this type stands for "limited rate" and allows to specify traffic which
is limited by transmission rate. Start and stop times govern the duration of
this traffic.
**UR**: this type stands for "unlimited rate" and allows to specify traffic
which is sent as fast as possible. Only TCP traffic is allowed. Start and stop
times govern the duration of this traffic.
**LT**: this type stands for "limited transfer" and allows to specify traffic
which is sent as fast as possible. Only TCP traffic is allowed. The amount of
data to transfer governs when this flow stops transmitting.
The second element in each line is the transport type an can be either "TCP" or
"UDP". Observe the restrictions of transport type with respect to the flow
type.
The third element is the package size to send. For TCP traffic this will also
adapt the segment size of the underlying socket.
The fourth element is the start time of the flow given in seconds.
For `LR` and `UR` flow types, the fifth element is the stop time given in
seconds. For the `LT` type, the fifth element is the maximum transfer size,
given in bytes. For all types, the fifth element governs when the flow will
stop.
The `LR` type takes a sixth element, specifying the desired transmission rate.
This value is given with a unit like "Mbps".
Commandline Arguments
---------------------
While flow descriptions are read from standard input, commandline arguments
allow to setup properties of the dumbbell topology. By default, the error rate
of the involved links is 0.0, which means no packet is dropped by the physical
links. The default TCP congestion-avoidance algorithm is NewReno and other
options are Tahoe, Reno, Westwood and WestwoodPlus. The default bandwith and
latency of the bottleneck link is 1Mbps and 50ms, respectively. The default
bandwidth and latency of the access links of the nodes to the routers is 10Mbps
and 1ms, respectively.
When giving an error rate other than 0.0, a random element is introduced. It is
possible to make this randomness deterministic by using the `--run` option
which allows to make deterministic runs with the same outcome, given the same
run number.
Depending on the flow definitions you might want to start the simulation early.
This is possible with the `--simstop` argument.
You can enable pcap tracing of all links with the `--tracing` option.

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/*
* Copyright (C) 2013 - Johannes Schauer <j.schauer at email.de>
*
* 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
*
*
* This code heavily borrows from ns3 itself which are copyright of their
* respective authors and redistributable under the same conditions.
*
*/
#include <stddef.h> // for size_t
#include <stdint.h> // for uint32_t
#include <stdlib.h> // for exit
#include <algorithm> // for min
#include <iomanip> // for operator<<, setw
#include <iostream> // for operator<<, basic_ostream, etc
#include <string> // for string, allocator, etc
#include <vector> // for vector
#include "ns3/address.h" // for Address
#include "ns3/application-container.h" // for ApplicationContainer
#include "ns3/application.h" // for Application
#include "ns3/boolean.h" // for BooleanValue
#include "ns3/callback.h" // for MakeCallback
#include "ns3/command-line.h" // for CommandLine
#include "ns3/config.h" // for SetDefault, Connect
#include "ns3/data-rate.h" // for DataRate
#include "ns3/double.h" // for DoubleValue
#include "ns3/enum.h" // for EnumValue
#include "ns3/error-model.h" // for RateErrorModel
#include "ns3/event-id.h" // for EventId
#include "ns3/fatal-error.h" // for NS_FATAL_ERROR
#include "ns3/global-value.h" // for GlobalValue
#include "ns3/header.h" // for Header
#include "ns3/inet-socket-address.h" // for InetSocketAddress
#include "ns3/internet-stack-helper.h" // for InternetStackHelper
#include "ns3/ipv4-address-helper.h" // for Ipv4AddressHelper
#include "ns3/ipv4-address.h" // for operator<<, Ipv4Address, etc
#include "ns3/ipv4-global-routing-helper.h"
#include "ns3/ipv4-header.h" // for Ipv4Header
#include "ns3/ipv4-interface-container.h" // for Ipv4InterfaceContainer
#include "ns3/ipv4.h" // for Ipv4
#include "ns3/net-device-container.h" // for NetDeviceContainer
#include "ns3/net-device.h" // for NetDevice
#include "ns3/node-container.h" // for NodeContainer
#include "ns3/node.h" // for Node
#include "ns3/nstime.h" // for Seconds, Time
#include "ns3/object.h" // for CreateObject
#include "ns3/packet-sink-helper.h" // for PacketSinkHelper
#include "ns3/packet.h" // for Packet
#include "ns3/point-to-point-helper.h" // for PointToPointHelper
#include "ns3/pointer.h" // for PointerValue
#include "ns3/ptr.h" // for Ptr, Create, DynamicCast
#include "ns3/rng-seed-manager.h" // for SeedManager
#include "ns3/simulator.h" // for Simulator
#include "ns3/socket.h" // for Socket, etc
#include "ns3/string.h" // for StringValue
#include "ns3/tcp-header.h" // for TcpHeader
#include "ns3/tcp-newreno.h" // for TcpNewReno
#include "ns3/tcp-reno.h" // for TcpReno
#include "ns3/tcp-socket-factory.h" // for TcpSocketFactory
#include "ns3/tcp-socket.h" // for TcpSocket
#include "ns3/tcp-tahoe.h" // for TcpTahoe
#include "ns3/tcp-westwood.h" // for TcpWestwood, etc
#include "ns3/type-id.h" // for TypeIdValue
#include "ns3/udp-header.h" // for UdpHeader
#include "ns3/udp-socket-factory.h" // for UdpSocketFactory
#include "ns3/uinteger.h" // for UintegerValue
/*
* we need to roll our own app instead of using one of the supplied helpers
* because of the following reasons:
*
* - bulktransferhelper can't do udp
* - onoffhelper doesnt allow access to the underlying sockets
* - not having access to the underlying sockets, means that any tracer can
* only be registered *after* the app created by the helper is started.
* This is ugly as it forces to start multiple tracers manually in synch
* with the app start time. Since it has to be multiple tracers, one cannot
* anymore use the wildcard mechanism to have a one-tracer-catches-all
* setup.
*
* this app allows to send an infinite number of tcp or udp packets at a fixed
* rate
* */
class LimitedRateApp : public ns3::Application
{
public:
LimitedRateApp();
virtual ~ LimitedRateApp();
void Setup(ns3::Ptr<ns3::Socket> socket, ns3::Address address,
uint32_t packetSize, ns3::DataRate dataRate);
private:
virtual void StartApplication(void);
virtual void StopApplication(void);
void ScheduleTx(void);
void SendPacket(void);
ns3::Ptr<ns3::Socket> m_socket;
ns3::Address m_peer;
uint32_t m_packetSize;
ns3::DataRate m_dataRate;
ns3::EventId m_sendEvent;
bool m_running;
};
LimitedRateApp::LimitedRateApp()
: m_socket(0),
m_peer(),
m_packetSize(0),
m_dataRate(0),
m_sendEvent(),
m_running(false)
{
}
LimitedRateApp::~LimitedRateApp()
{
m_socket = 0;
}
void
LimitedRateApp::Setup(ns3::Ptr<ns3::Socket> socket,
ns3::Address address, uint32_t packetSize,
ns3::DataRate dataRate)
{
m_socket = socket;
m_peer = address;
m_packetSize = packetSize;
m_dataRate = dataRate;
}
void LimitedRateApp::StartApplication(void)
{
m_running = true;
m_socket->Bind();
m_socket->Connect(m_peer);
SendPacket();
}
void LimitedRateApp::StopApplication(void)
{
m_running = false;
if (m_sendEvent.IsRunning()) {
ns3::Simulator::Cancel(m_sendEvent);
}
if (m_socket) {
m_socket->Close();
}
}
void LimitedRateApp::SendPacket(void)
{
ns3::Ptr<ns3::Packet> packet =
ns3::Create<ns3::Packet>(m_packetSize);
m_socket->Send(packet);
ScheduleTx();
}
void LimitedRateApp::ScheduleTx(void)
{
if (m_running) {
ns3::Time tNext(ns3::Seconds(
m_packetSize * 8 /
static_cast<double>(m_dataRate.GetBitRate())));
m_sendEvent = ns3::Simulator::Schedule(
tNext, &LimitedRateApp::SendPacket, this);
}
}
/*
* this app borrows from the BulkSendApplication but keeps sending for an
* infinite time (until Stop() is reached) and receives an already created
* socket instead of creating its own
*
* it has unlimited rate in the sense that it pushes new packets into the
* sending buffer of the socket until it is full and keeps filling that buffer
* once the socket becomes ready to send again.
*
* due to this nature of operation it is only suitable for streaming sockets
*/
class UnlimitedRateApp : public ns3::Application
{
public:
UnlimitedRateApp();
virtual ~ UnlimitedRateApp();
void Setup(ns3::Ptr<ns3::Socket> socket, ns3::Address address,
uint32_t packetSize);
private:
// inherited from Application base class.
virtual void StartApplication(void); // Called at time specified by Start
virtual void StopApplication(void); // Called at time specified by Stop
void SendData();
ns3::Ptr<ns3::Socket> m_socket; // Associated socket
ns3::Address m_peer; // Peer address
bool m_connected; // True if connected
uint32_t m_packetSize; // Size of data to send each time
void ConnectionSucceeded(ns3::Ptr<ns3::Socket> socket);
void ConnectionFailed(ns3::Ptr<ns3::Socket> socket);
void DataSend(ns3::Ptr<ns3::Socket>, uint32_t); // for socket's SetSendCallback
void Ignore(ns3::Ptr<ns3::Socket> socket);
};
UnlimitedRateApp::UnlimitedRateApp()
: m_socket(0),
m_connected(false),
m_packetSize(512)
{
}
UnlimitedRateApp::~UnlimitedRateApp()
{
m_socket = 0;
}
void
UnlimitedRateApp::Setup(ns3::Ptr<ns3::Socket> socket,
ns3::Address address, uint32_t packetSize)
{
m_socket = socket;
m_peer = address;
m_packetSize = packetSize;
// Fatal error if socket type is not NS3_SOCK_STREAM or NS3_SOCK_SEQPACKET
if (m_socket->GetSocketType() != ns3::Socket::NS3_SOCK_STREAM &&
m_socket->GetSocketType() != ns3::Socket::NS3_SOCK_SEQPACKET) {
NS_FATAL_ERROR
("Using UnlimitedRateApp with an incompatible socket type. "
"UnlimitedRateApp requires SOCK_STREAM or SOCK_SEQPACKET. "
"In other words, use TCP instead of UDP.");
}
}
void UnlimitedRateApp::StartApplication(void)
{
m_socket->Bind();
m_socket->Connect(m_peer);
m_socket->ShutdownRecv();
m_socket->SetConnectCallback(ns3::MakeCallback(
&UnlimitedRateApp::ConnectionSucceeded, this),
ns3::MakeCallback(
&UnlimitedRateApp::ConnectionFailed, this));
m_socket->SetSendCallback(ns3::MakeCallback(
&UnlimitedRateApp::DataSend, this));
if (m_connected)
SendData();
}
void UnlimitedRateApp::StopApplication(void) // Called at time specified by Stop
{
if (m_socket != 0) {
m_socket->Close();
m_connected = false;
}
}
void UnlimitedRateApp::SendData(void)
{
// We exit this loop when actual<toSend as the send side
// buffer is full. The "DataSend" callback will pop when
// some buffer space has freed ip.
for (;;) {
ns3::Ptr<ns3::Packet> packet =
ns3::Create<ns3::Packet>(m_packetSize);
int actual = m_socket->Send(packet);
if ((unsigned) actual != m_packetSize)
break;
}
}
void UnlimitedRateApp::ConnectionSucceeded(ns3::Ptr<ns3::Socket> socket)
{
m_connected = true;
SendData();
}
void UnlimitedRateApp::ConnectionFailed(ns3::Ptr<ns3::Socket> socket)
{
}
void UnlimitedRateApp::DataSend(ns3::Ptr<ns3::Socket>, uint32_t)
{
if (m_connected) { // Only send new data if the connection has completed
ns3::Simulator::ScheduleNow(&UnlimitedRateApp::SendData, this);
}
}
/*
* this app borrows from the BulkSendApplication but instead allows a socket
* being passed to it instead of creating its own socket internally.
*
* it has unlimited rate in the sense that it pushes new packets into the
* sending buffer of the socket until it is full and keeps filling that buffer
* once the socket becomes ready to send again.
*
* due to this nature of operation it is only suitable for streaming sockets
*/
class LimitedTransferApp : public ns3::Application
{
public:
LimitedTransferApp();
virtual ~ LimitedTransferApp();
void Setup(ns3::Ptr<ns3::Socket> socket, ns3::Address address,
uint32_t packetSize, uint32_t maxBytes);
private:
// inherited from Application base class.
virtual void StartApplication(void); // Called at time specified by Start
virtual void StopApplication(void); // Called at time specified by Stop
void SendData();
ns3::Ptr<ns3::Socket> m_socket; // Associated socket
ns3::Address m_peer; // Peer address
bool m_connected; // True if connected
uint32_t m_packetSize; // Size of data to send each time
uint32_t m_totBytes; // Total bytes sent so far
uint32_t m_maxBytes; // Limit total number of bytes sent
void ConnectionSucceeded(ns3::Ptr<ns3::Socket> socket);
void ConnectionFailed(ns3::Ptr<ns3::Socket> socket);
void DataSend(ns3::Ptr<ns3::Socket>, uint32_t); // for socket's SetSendCallback
void Ignore(ns3::Ptr<ns3::Socket> socket);
};
LimitedTransferApp::LimitedTransferApp()
: m_socket(0),
m_connected(false),
m_packetSize(512),
m_totBytes(0),
m_maxBytes(0)
{
}
LimitedTransferApp::~LimitedTransferApp()
{
m_socket = 0;
}
void
LimitedTransferApp::Setup(ns3::Ptr<ns3::Socket> socket,
ns3::Address address, uint32_t packetSize,
uint32_t maxBytes)
{
m_socket = socket;
m_peer = address;
m_packetSize = packetSize;
m_maxBytes = maxBytes;
// Fatal error if socket type is not NS3_SOCK_STREAM or NS3_SOCK_SEQPACKET
if (m_socket->GetSocketType() != ns3::Socket::NS3_SOCK_STREAM &&
m_socket->GetSocketType() != ns3::Socket::NS3_SOCK_SEQPACKET) {
NS_FATAL_ERROR
("Using LimitedTransferApp with an incompatible socket type. "
"LimitedTransferApp requires SOCK_STREAM or SOCK_SEQPACKET. "
"In other words, use TCP instead of UDP.");
}
}
void LimitedTransferApp::StartApplication(void)
{
m_socket->Bind();
m_socket->Connect(m_peer);
m_socket->ShutdownRecv();
m_socket->SetConnectCallback(MakeCallback(
&LimitedTransferApp::ConnectionSucceeded, this),
MakeCallback(
&LimitedTransferApp::ConnectionFailed, this));
m_socket->SetSendCallback(
ns3::MakeCallback(&LimitedTransferApp::DataSend, this));
if (m_connected)
SendData();
}
void LimitedTransferApp::StopApplication(void) // Called at time specified by Stop
{
if (m_socket != 0) {
m_socket->Close();
m_connected = false;
}
}
void LimitedTransferApp::SendData(void)
{
while (m_totBytes<m_maxBytes) {
uint32_t toSend = m_packetSize;
// Make sure we don't send too many
if (m_maxBytes> 0) {
toSend = std::min(m_packetSize, m_maxBytes - m_totBytes);
}
ns3::Ptr<ns3::Packet> packet =
ns3::Create<ns3::Packet>(toSend);
int actual = m_socket->Send(packet);
if (actual> 0) {
m_totBytes += actual;
}
// We exit this loop when actual<toSend as the send side
// buffer is full. The "DataSent" callback will pop when
// some buffer space has freed ip.
if ((unsigned) actual != toSend) {
break;
}
}
// Check if time to close (all sent)
if (m_totBytes == m_maxBytes && m_connected) {
m_socket->Close();
m_connected = false;
}
}
void LimitedTransferApp::ConnectionSucceeded(ns3::Ptr<ns3::Socket>
socket)
{
m_connected = true;
SendData();
}
void LimitedTransferApp::ConnectionFailed(ns3::Ptr<ns3::Socket> socket)
{
}
void LimitedTransferApp::DataSend(ns3::Ptr<ns3::Socket>, uint32_t)
{
if (m_connected) { // Only send new data if the connection has completed
ns3::Simulator::ScheduleNow(&LimitedTransferApp::SendData, this);
}
}
static void CwndTracer(std::string context, uint32_t oldval,
uint32_t newval)
{
if (newval> 2147483648) {
std::cerr << "impossibly high cwnd value: " << newval << std::endl;
return;
}
std::cout << std::setw(8) << ns3::Simulator::Now().GetSeconds() << " ";
std::cout << context << " " << newval << std::endl;
}
static void SsThreshTracer(std::string context, uint32_t oldval,
uint32_t newval)
{
std::cout << std::setw(8) << ns3::Simulator::Now().GetSeconds() << " ";
std::cout << context << " " << newval << std::endl;
}
static void PacketSinkRxTracer(std::string context,
ns3::Ptr<const ns3::Packet> p,
const ns3::Address & addr)
{
std::cout << std::setw(8) << ns3::Simulator::Now().GetSeconds() << " ";
std::cout << context << " " << p->GetSize() << std::endl;
}
static void TxQueueDropTracer(std::string context,
ns3::Ptr<const ns3::Packet> p)
{
ns3::Ipv4Header ipv4h;
uint32_t len = p->PeekHeader(ipv4h);
if (len == 0) {
std::cout << std::setw(8) <<
ns3::Simulator::Now().GetSeconds() << " ";
std::cout << context << " 0" << std::endl;
} else {
std::cout << std::setw(8) <<
ns3::Simulator::Now().GetSeconds() << " ";
std::cout << context << " " << ipv4h.GetSource() <<
" " << ipv4h.GetDestination() << std::endl;
}
}
static void PhyRxDropTracer(std::string context,
ns3::Ptr<const ns3::Packet> p)
{
std::cout << std::setw(8) << ns3::Simulator::Now().GetSeconds() << " ";
std::cout << context << " 0" << std::endl;
}
void printHeaderSizes()
{
ns3::Header * temp_header = new ns3::Ipv4Header();
uint32_t ip_header = temp_header->GetSerializedSize();
std::cerr << "IP Header size is: " << ip_header << std::endl;
delete temp_header;
temp_header = new ns3::TcpHeader();
uint32_t tcp_header = temp_header->GetSerializedSize();
std::cerr << "TCP Header size is: " << tcp_header << std::endl;
delete temp_header;
temp_header = new ns3::UdpHeader();
uint32_t udp_header = temp_header->GetSerializedSize();
std::cerr << "UDP Header size is: " << udp_header << std::endl;
delete temp_header;
}
int main(int argc, char *argv[])
{
std::string transport_prot = "TcpNewReno";
double error_p = 0.0;
std::string bottleneck_bandwidth = "1Mbps";
std::string access_bandwidth = "10Mbps";
std::string bottleneck_delay = "50ms";
std::string access_delay = "1ms";
uint32_t run = 0;
double simstop = 0.0;
bool pcaptracing = false;
ns3::CommandLine cmd;
cmd.AddValue("tcpcaa",
"Default TCP congestion-avoidance algorithm to use: "
"TcpTahoe, TcpReno, TcpNewReno, TcpWestwood, TcpWestwoodPlus ",
transport_prot);
cmd.AddValue("error_p", "Packet error rate", error_p);
cmd.AddValue("bandwidth", "Bottleneck link bandwidth",
bottleneck_bandwidth);
cmd.AddValue("access_bandwidth", "Access link bandwidth",
access_bandwidth);
cmd.AddValue("delay", "Bottleneck link delay", bottleneck_delay);
cmd.AddValue("access delay", "Access link delay", access_delay);
cmd.AddValue("run", "Run index (for setting repeatable seeds)", run);
cmd.AddValue("simstop", "Stop simulator after this many seconds",
simstop);
cmd.AddValue("tracing", "Flag to enable/disable pcap tracing",
pcaptracing);
cmd.Parse(argc, argv);
ns3::SeedManager::SetSeed(1);
ns3::SeedManager::SetRun(run);
if (transport_prot.compare("TcpTahoe") == 0)
ns3::Config::SetDefault("ns3::TcpL4Protocol::SocketType",
ns3::TypeIdValue(ns3::TcpTahoe::GetTypeId()));
else if (transport_prot.compare("TcpReno") == 0)
ns3::Config::SetDefault("ns3::TcpL4Protocol::SocketType",
ns3::TypeIdValue(ns3::TcpReno::GetTypeId()));
else if (transport_prot.compare("TcpNewReno") == 0)
ns3::Config::SetDefault("ns3::TcpL4Protocol::SocketType",
ns3::TypeIdValue(ns3::TcpNewReno::GetTypeId()));
else if (transport_prot.compare("TcpWestwood") == 0) {
ns3::Config::SetDefault("ns3::TcpL4Protocol::SocketType",
ns3::TypeIdValue(ns3::TcpWestwood::GetTypeId()));
ns3::Config::SetDefault("ns3::TcpWestwood::FilterType",
ns3::EnumValue(ns3::TcpWestwood::TUSTIN));
} else if (transport_prot.compare("TcpWestwoodPlus") == 0) {
ns3::Config::SetDefault("ns3::TcpL4Protocol::SocketType",
ns3::TypeIdValue(ns3::TcpWestwood::GetTypeId()));
ns3::Config::SetDefault("ns3::TcpWestwood::ProtocolType",
ns3::EnumValue(ns3::TcpWestwood::WESTWOODPLUS));
ns3::Config::SetDefault("ns3::TcpWestwood::FilterType",
ns3::EnumValue(ns3::TcpWestwood::TUSTIN));
} else {
std::cerr << "Invalid TCP version";
exit(1);
}
/* the default is to not calculate checksums but if we want pcap traces
* then we calculate them */
if (pcaptracing)
ns3::GlobalValue::Bind("ChecksumEnabled", ns3::BooleanValue(true));
// read in traffic definitions from standard input
std::cerr << "Reading traffic descriptions from standard input..."
<< std::endl;
std::vector<std::string> inputlines;
std::string input_line;
for (std::string s; std::getline(std::cin, s);) {
inputlines.push_back(s);
}
uint32_t number_of_clients = inputlines.size();
std::cerr << "creating " << number_of_clients <<
" data streams" << std::endl;
ns3::PointToPointHelper bottleNeckLink;
bottleNeckLink.SetDeviceAttribute("DataRate",
ns3::StringValue(bottleneck_bandwidth));
bottleNeckLink.SetChannelAttribute("Delay",
ns3::StringValue(bottleneck_delay));
ns3::PointToPointHelper pointToPointLeaf;
pointToPointLeaf.SetDeviceAttribute("DataRate",
ns3::StringValue(access_bandwidth));
pointToPointLeaf.SetChannelAttribute("Delay",
ns3::StringValue(access_delay));
int port = 9000;
/* we cannot use the PointToPointDumbbellHelper because it hides the
* NetDeviceContainer it creates from us. Therefore, we are creating the
* dumbbell topology manually */
// create all the nodes
ns3::NodeContainer routers;
routers.Create(2);
ns3::NodeContainer leftleaves;
leftleaves.Create(number_of_clients);
ns3::NodeContainer rightleaves;
rightleaves.Create(number_of_clients);
// error model
ns3::Ptr<ns3::RateErrorModel> em =
ns3::CreateObject<ns3::RateErrorModel>();
em->SetAttribute("ErrorRate", ns3::DoubleValue(error_p));
// add the link connecting the routers
ns3::NetDeviceContainer routerdevices =
bottleNeckLink.Install(routers);
ns3::NetDeviceContainer leftrouterdevices;
ns3::NetDeviceContainer leftleafdevices;
ns3::NetDeviceContainer rightrouterdevices;
ns3::NetDeviceContainer rightleafdevices;
// add links on both sides
for (uint32_t i = 0; i<number_of_clients; ++i) {
// add the left side links
ns3::NetDeviceContainer cleft =
pointToPointLeaf.Install(routers.Get(0), leftleaves.Get(i));
leftrouterdevices.Add(cleft.Get(0));
leftleafdevices.Add(cleft.Get(1));
cleft.Get(0)->SetAttribute("ReceiveErrorModel",
ns3::PointerValue(em));
// add the right side links
ns3::NetDeviceContainer cright =
pointToPointLeaf.Install(routers.Get(1), rightleaves.Get(i));
rightrouterdevices.Add(cright.Get(0));
rightleafdevices.Add(cright.Get(1));
cright.Get(0)->SetAttribute("ReceiveErrorModel",
ns3::PointerValue(em));
}
// install internet stack on all nodes
ns3::InternetStackHelper stack;
stack.Install(routers);
stack.Install(leftleaves);
stack.Install(rightleaves);
// assign ipv4 addresses (ipv6 addresses apparently are still not fully
// supported by ns3)
ns3::Ipv4AddressHelper routerips =
ns3::Ipv4AddressHelper("10.3.0.0", "255.255.255.0");
ns3::Ipv4AddressHelper leftips =
ns3::Ipv4AddressHelper("10.1.0.0", "255.255.255.0");
ns3::Ipv4AddressHelper rightips =
ns3::Ipv4AddressHelper("10.2.0.0", "255.255.255.0");
ns3::Ipv4InterfaceContainer routerifs;
ns3::Ipv4InterfaceContainer leftleafifs;
ns3::Ipv4InterfaceContainer leftrouterifs;
ns3::Ipv4InterfaceContainer rightleafifs;
ns3::Ipv4InterfaceContainer rightrouterifs;
// assign addresses to connection connecting routers
routerifs = routerips.Assign(routerdevices);
// assign addresses to connection between routers and leaves
for (uint32_t i = 0; i<number_of_clients; ++i) {
// Assign to left side
ns3::NetDeviceContainer ndcleft;
ndcleft.Add(leftleafdevices.Get(i));
ndcleft.Add(leftrouterdevices.Get(i));
ns3::Ipv4InterfaceContainer ifcleft = leftips.Assign(ndcleft);
leftleafifs.Add(ifcleft.Get(0));
leftrouterifs.Add(ifcleft.Get(1));
leftips.NewNetwork();
// Assign to right side
ns3::NetDeviceContainer ndcright;
ndcright.Add(rightleafdevices.Get(i));
ndcright.Add(rightrouterdevices.Get(i));
ns3::Ipv4InterfaceContainer ifcright = rightips.Assign(ndcright);
rightleafifs.Add(ifcright.Get(0));
rightrouterifs.Add(ifcright.Get(1));
rightips.NewNetwork();
}
ns3::ApplicationContainer sinkApps, udpApp;
ns3::Address sinkLocalAddress(
ns3::InetSocketAddress(
ns3::Ipv4Address::GetAny(), port));
ns3::PacketSinkHelper TcpPacketSinkHelper("ns3::TcpSocketFactory",
sinkLocalAddress);
ns3::PacketSinkHelper UdpPacketSinkHelper("ns3::UdpSocketFactory",
sinkLocalAddress);
// create all the source and sink apps
for (size_t i = 0; i<inputlines.size(); ++i) {
ns3::Ptr<ns3::Socket> sockptr;
unsigned int pkgsize;
float start;
std::stringstream ss(inputlines[i]);
std::string app, transport;
ss >> app >> transport >> pkgsize >> start;
if (transport.compare("TCP") == 0) {
// setup source socket
sockptr =
ns3::Socket::CreateSocket(leftleaves.Get(i),
ns3::TcpSocketFactory::GetTypeId());
ns3::Ptr<ns3::TcpSocket> tcpsockptr =
ns3::DynamicCast<ns3::TcpSocket> (sockptr);
tcpsockptr->SetAttribute("SegmentSize",
ns3::UintegerValue(pkgsize));
std::stringstream nodeidss;
nodeidss << leftleaves.Get(i)->GetId();
std::string prefix = "/NodeList/" + nodeidss.str();
sockptr->TraceConnect("CongestionWindow",
prefix +
"/$ns3::TcpL4Protocol/SocketList/0/CongestionWindow",
ns3::MakeCallback(&CwndTracer));
sockptr->TraceConnect("SlowStartThreshold",
prefix +
"/$ns3::TcpL4Protocol/SocketList/0/SlowStartThreshold",
ns3::MakeCallback(&SsThreshTracer));
// setup sink
sinkApps.Add(TcpPacketSinkHelper.Install(rightleaves.Get(i)));
} else if (transport.compare("UDP") == 0) {
// setup source socket
sockptr =
ns3::Socket::CreateSocket(leftleaves.Get(i),
ns3::UdpSocketFactory::GetTypeId());
// setup sink
sinkApps.Add(UdpPacketSinkHelper.Install(rightleaves.Get(i)));
} else {
std::cerr << "unknown transport type: " <<
transport << std::endl;
exit(1);
}
if (app.compare("LR") == 0) {
/* additionally read stop time and rate */
float stop;
std::string rate;
ss >> stop >> rate;
ns3::Ptr<LimitedRateApp> app =
ns3::CreateObject<LimitedRateApp> ();
app->Setup(sockptr,
ns3::InetSocketAddress(rightleafifs.GetAddress(i),
port), pkgsize,
ns3::DataRate(rate));
leftleaves.Get(i)->AddApplication(app);
app->SetStartTime(ns3::Seconds(start));
app->SetStopTime(ns3::Seconds(stop));
} else if (app.compare("UR") == 0) {
/* additionally read stop time */
float stop;
ss >> stop;
ns3::Ptr<UnlimitedRateApp> app =
ns3::CreateObject<UnlimitedRateApp> ();
app->Setup(sockptr,
ns3::InetSocketAddress(rightleafifs.GetAddress(i),
port), pkgsize);
leftleaves.Get(i)->AddApplication(app);
app->SetStartTime(ns3::Seconds(start));
app->SetStopTime(ns3::Seconds(stop));
} else if (app.compare("LT") == 0) {
/* additionally read maxtransfer */
unsigned int maxtransfer;
ss >> maxtransfer;
ns3::Ptr<LimitedTransferApp> app =
ns3::CreateObject<LimitedTransferApp> ();
app->Setup(sockptr,
ns3::InetSocketAddress(rightleafifs.GetAddress(i),
port), pkgsize, maxtransfer);
leftleaves.Get(i)->AddApplication(app);
app->SetStartTime(ns3::Seconds(start));
} else {
std::cerr << "unknown app type: " << app << std::endl;
exit(1);
}
}
sinkApps.Start(ns3::Seconds(0.0));
ns3::Ipv4GlobalRoutingHelper::PopulateRoutingTables();
// connect to some trace sources
ns3::Config::Connect("/NodeList/*/DeviceList/*/TxQueue/Drop",
ns3::MakeCallback(&TxQueueDropTracer));
ns3::Config::Connect("/NodeList/*/ApplicationList/*/$ns3::PacketSink/Rx",
ns3::MakeCallback(&PacketSinkRxTracer));
ns3::Config::Connect("/NodeList/*/DeviceList/*/$ns3::PointToPointNetDevice/PhyRxDrop",
ns3::MakeCallback(&PhyRxDropTracer));
// pcap tracing
if (pcaptracing)
pointToPointLeaf.EnablePcapAll(argv[0], true);
if (simstop > 0.0) {
ns3::Simulator::Stop(ns3::Seconds(simstop));
}
ns3::Simulator::Run();
std::cerr << "Dumbbell Left Bottleneck NodeID " <<
routers.Get(0)->GetId() << std::endl;
std::cerr << "Dumbbell Right Bottleneck NodeID " <<
routers.Get(1)->GetId() << std::endl;
for (uint32_t i = 0; i<number_of_clients; ++i) {
std::cerr << "Dumbbell Left Leaf " << i << " NodeID " <<
leftleaves.Get(i)->GetId() << " IP Addr " <<
leftleafifs.GetAddress(i) << std::endl;
}
for (uint32_t i = 0; i<number_of_clients; ++i) {
std::cerr << "Dumbbell Right Leaf " << i << " NodeID " <<
rightleaves.Get(i)->GetId() << " IP Addr " << rightleafifs.
GetAddress(i) << std::endl;
}
ns3::Simulator::Destroy();
return 0;
}