connecting ns3 to real network

[Preeti M Sobarad]

Hello Everyone,

I am working on Emulating real network using ns-3. I am trying to achieve the below topology. I have also attached the diagram. Please take a look at it. 

Client (real host) 192.168.100.2  - Ubuntu (real host) 192.168.100.3(promisc) - NS-3 node1(in Ubuntu) 192.168.100.4- NS-3 node2(in Ubuntu) 192.168.200.4 - Ubuntu (real host)  192.168.200.3(promisc) - Server (real host) 192.168.200.2

I used fd-emu-ping.cc to get started. I am able to reach ns3 node from my external client machine. I wanted to extend this to a Point-to-point network belonging to two different subnets and then establish communication in between them. I built on top of fd-emu-ping.cc to make two connections. I also used static routing to create route between point-to-point nodes. I have attached my code.

I am able to ping ns3 node1 from Client. I am able to ping ns3 node 2 from Server. I am able to ping Client and Server from ns3 nodes. But I am not able to ping Server from Client and vice versa. 

Kindly help me get solution to this point-to-point connection issue. I am happy to provide more information if needed. Your help will be really appreciated. 

PS: I am unable to attach a file. I will reply to this message and try to attach. 

#include "ns3/abort.h"
#include "ns3/core-module.h"
#include "ns3/internet-module.h"
#include "ns3/network-module.h"
#include "ns3/fd-net-device-module.h"
#include "ns3/internet-apps-module.h"
#include "ns3/ipv4-static-routing-helper.h"
#include "ns3/ipv4-list-routing-helper.h"
#include "ns3/point-to-point-module.h"

using namespace ns3;

NS_LOG_COMPONENT_DEFINE ("PingEmulationExample");

static void
PingRtt (std::string context, Time rtt)
{
  NS_LOG_UNCOND ("Received Response with RTT = " << rtt);
}


int
main (int argc, char *argv[])
{
  NS_LOG_INFO ("Ping Emulation Example");


  bool verbose = true;


  std::string deviceName1 ("enp6s0");
  std::string deviceName2 ("enp5s0");

  CommandLine cmd (__FILE__);
  cmd.AddValue ("deviceName1", "Device name1", deviceName1);
  // cmd.AddValue ("remote1", "Remote IP address 1 (dotted decimal only please)", remote1);


  cmd.AddValue ("deviceName2", "Device name2", deviceName2);
  // cmd.AddValue ("remote2", "Remote IP address 2 (dotted decimal only please)", remote2);


  cmd.Parse (argc, argv);


  std::string remote1 ("192.168.100.2"); // example.com
  std::string remote2 ("192.168.200.2"); // example.com

  Ipv4Address gateway1 ("192.168.100.3"); // LMAIp
  Ipv4Address gateway2 ("192.168.200.3"); // CNIp

  Ipv4Mask localMask ("255.255.255.0");

  Ipv4Address remoteIp1 (remote1.c_str ());
  Ipv4Address remoteIp2 (remote2.c_str ());

  Ipv4Address localIp1 ("192.168.100.4");
  Ipv4Address localIp2 ("192.168.200.4");

  if(verbose){
    LogComponentEnable("PingEmulationExample",LOG_LEVEL_INFO );
    LogComponentEnable("EmuFdNetDeviceHelper",LOG_LEVEL_INFO );
  }

  GlobalValue::Bind ("SimulatorImplementationType", StringValue ("ns3::RealtimeSimulatorImpl"));
  GlobalValue::Bind ("ChecksumEnabled", BooleanValue (true));

  NS_LOG_INFO ("Create Node1");
  Ptr<Node> node1 = CreateObject<Node> ();
  NS_LOG_INFO ("Create Node2");
  Ptr<Node> node2 = CreateObject<Node> ();

  NodeContainer nodes(node1, node2);

  NS_LOG_INFO ("Create Device1");
  EmuFdNetDeviceHelper emu1;
  emu1.SetDeviceName (deviceName1);
  NetDeviceContainer devices1 = emu1.Install (node1);
  Ptr<NetDevice> device1 = devices1.Get (0);
  device1->SetAttribute ("Address", Mac48AddressValue (Mac48Address::Allocate ()));

  NS_LOG_INFO ("Create Device2");
  EmuFdNetDeviceHelper emu2;
  emu2.SetDeviceName (deviceName2);
  NetDeviceContainer devices2 = emu2.Install (node2);
  Ptr<NetDevice> device2 = devices2.Get (0);
  device2->SetAttribute ("Address", Mac48AddressValue (Mac48Address::Allocate ()));




  PointToPointHelper pointToPoint;
  pointToPoint.SetDeviceAttribute ("DataRate", StringValue ("5Mbps"));
  pointToPoint.SetChannelAttribute ("Delay", StringValue ("1500ms"));
  NetDeviceContainer p2p_link = pointToPoint.Install(nodes);

  NS_LOG_INFO ("Add Internet Stack on Device 1 and Device 2");
  InternetStackHelper internetStackHelper;
  internetStackHelper.Install (nodes);

  Ipv4AddressHelper addresses_localip1;
  addresses_localip1.SetBase ("192.168.100.4", "255.255.255.255"); // ns3 node
  Ipv4InterfaceContainer interfaces = addresses_localip1.Assign (p2p_link.Get(0));

  Ipv4AddressHelper addresses_localip2;
  addresses_localip2.SetBase ("192.168.200.4", "255.255.255.255"); //ns3 node
  interfaces = addresses_localip2.Assign (p2p_link.Get(1));

  NS_LOG_INFO ("Create IPv4 Interface on device 1");
  Ptr<Ipv4> ipv4_1 = node1->GetObject<Ipv4> ();
  uint32_t interface1 = ipv4_1->AddInterface (device1);
  Ipv4InterfaceAddress address1 = Ipv4InterfaceAddress (localIp1, localMask);
  ipv4_1->AddAddress (interface1, address1);
  ipv4_1->SetMetric (interface1, 1);
  ipv4_1->SetUp (interface1);


  NS_LOG_INFO ("Create IPv4 Interface on device 2");
  Ptr<Ipv4> ipv4_2 = node2->GetObject<Ipv4> ();
  uint32_t interface2 = ipv4_2->AddInterface (device2);
  Ipv4InterfaceAddress address2 = Ipv4InterfaceAddress (localIp2, localMask);
  ipv4_2->AddAddress (interface2, address2);
  ipv4_2->SetMetric (interface2, 1);
  ipv4_2->SetUp (interface2);


  Ipv4StaticRoutingHelper ipv4RoutingHelper1;
  Ptr<Ipv4StaticRouting> staticRouting1 = ipv4RoutingHelper1.GetStaticRouting (ipv4_1);
  //staticRouting1->SetDefaultRoute (gateway1, interface1);


  // creating a path between ns3 interface1 to client device
  staticRouting1->AddHostRouteTo (Ipv4Address ("192.168.100.2"), Ipv4Address ("192.168.100.2"), interface1, 1);
  // static routing between p2p installed interfaces on node 1 and server device
  staticRouting1->AddHostRouteTo (Ipv4Address ("192.168.200.2"), Ipv4Address ("192.168.200.4"), interfaces.Get(0).second, 1);


  Ipv4StaticRoutingHelper ipv4RoutingHelper2;
  Ptr<Ipv4StaticRouting> staticRouting2 = ipv4RoutingHelper2.GetStaticRouting (ipv4_2);
  //staticRouting2->SetDefaultRoute (gateway2, interface2);

  // creating a path between ns3 interface1 to client device
  staticRouting2->AddHostRouteTo (Ipv4Address ("192.168.200.2"), Ipv4Address ("192.168.200.2"), interface2, 1);
  // static routing between p2p installed interfaces on node 1 and server device
  staticRouting2->AddHostRouteTo (Ipv4Address ("192.168.100.2"), Ipv4Address ("192.168.100.4"), interfaces.Get(1).second, 1);


  NS_LOG_INFO ("Create V4Ping Appliation1");
  Ptr<V4Ping> app1 = CreateObject<V4Ping> ();
  app1->SetAttribute ("Remote", Ipv4AddressValue (remoteIp1));
  app1->SetAttribute ("Verbose", BooleanValue (true) );
  node1->AddApplication (app1);
  app1->SetStartTime (Seconds (1.0));
  app1->SetStopTime (Seconds (10.0));


  NS_LOG_INFO ("Create V4Ping Appliation2");
  Ptr<V4Ping> app2 = CreateObject<V4Ping> ();
  app2->SetAttribute ("Remote", Ipv4AddressValue (remoteIp2));
  app2->SetAttribute ("Verbose", BooleanValue (true) );
  node2->AddApplication (app2);
  app2->SetStartTime (Seconds (1.0));
  app2->SetStopTime (Seconds (10.0));




  Names::Add ("app1", app1);
  Names::Add ("app2", app2);

  Config::Connect ("/Names/app1/Rtt", MakeCallback (&PingRtt));
  Config::Connect ("/Names/app2/Rtt", MakeCallback (&PingRtt));

  emu1.EnablePcap ("emu1-ping", device1, true);
  emu2.EnablePcap ("emu2-ping", device2, true);

  pointToPoint.EnablePcapAll("emu");

  NS_LOG_INFO ("Run Emulation.");
  Simulator::Stop (Seconds (11.0));
  Simulator::Run ();
  Simulator::Destroy ();
  NS_LOG_INFO ("Done.");
}

[Preeti M Sobarad]

Also, I referred these links for information but did not help me in establishing point-to-point link.

https://groups.google.com/forum/#!topic/ns-3-users/UjfdtEkqaOU

https://groups.google.com/forum/#!starred/ns-3-users/WmvkL_ZUXXA

[Preeti M Sobarad]

Attaching the code and topology. I'm using 3 systems to set this up. I have a Ubuntu desktop with 2 interfaces and 2 laptops acting as client and server. Please help me with this. 

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[Preeti M Sobarad]

Can anybody please help me? I tried a lot but I am not able to establish the point to point link....Your help will be really appreciated..

On Friday, July 24, 2020 at 12:10:29 PM UTC-7, Preeti M Sobarad wrote:

[Jay Patel]

Hi,

You can refer this links for more details : 

https://www.nsnam.org/wiki/HOWTOs

https://sites.google.com/thapar.edu/ramansinghtechpages/step-wise-establishing-connection - This is interesting, I had tried that myself, also very well written.

https://www.nsnam.org/wiki/HOWTO_make_ns-3_interact_with_the_real_world

I hope that helps.

With Regards,

Jay Patel

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[Preeti M Sobarad]

Hello Jay,

Yes I have tried Raman's implementation too.

But now in this I am using real devices to communicate with ns3. using emufdnet. and i am not able to establish link between the 2 nodes of ns3 using p2p

On Tuesday, July 28, 2020 at 2:12:57 PM UTC-7, Jay Patel wrote:

Hi,

You can refer this links for more details : 

https://www.nsnam.org/wiki/HOWTOs

https://sites.google.com/thapar.edu/ramansinghtechpages/step-wise-establishing-connection - This is interesting, I had tried that myself, also very well written.

https://www.nsnam.org/wiki/HOWTO_make_ns-3_interact_with_the_real_world

I hope that helps.

With Regards,

Jay Patel

To unsubscribe from this group and stop receiving emails from it, send an email to ns-3-...@googlegroups.com.

[Haopeng Wang]

Hi Preeti,

Did you figure it out?