How to get source/destination IP address of a packet in NS3 when I am using MacRX or SwitchPortRx TraceSource for CsmaNetDevice or OFSwittch13Port?

[Abdelkader Gnichi]

I am trying to simulate a fattree network in NS3. I have Udp traffic generated between two hosts the sender and the receiver having 192.168.1.1 and 192.168.1.7 respectively as source and destination ip addresses , the udp traffic passing by several switches (ofswitch13 switches) to reach it's destination. Then I use

Config::Connect("NodeList/*/$ns3::Node/$ns3::OFSwitch13Device/PortList/*/$ns3::OFSwitch13Port/SwitchPortRx"

Or

Config::Connect("/NodeList/*/DeviceList/*/MacRx", MakeCallback(&TracePacketReceive));

to fire my sink method TracePacketReceive(string context,Ptr packet) which is called successfully :

void TracePacketReceive(string context,Ptr<const Packet> packet) { 

regex pattern("[0-9]+");

 cout << context << endl;

 smatch sm; 

regex_search(context, sm, pattern); 

cout << stoi(sm.str()) - 6 << " here" << endl; 

cout << "txPacket: " << packet->GetSize() << " \t simTime: " << Simulator::Now().GetSeconds() << endl; Ptr<Packet> p = packet->Copy(); Ipv4Header ipHeader; p->PeekHeader(ipHeader);

 Ipv4Address sourceIp = Ipv4Address::ConvertFrom(ipHeader.GetSource()); 

Ipv4Address destIp = ipHeader.GetDestination(); 

std::cout << "Source IP: " << sourceIp << std::endl; std::cout << "Destination IP: " << destIp << std::endl; 

}

but i'm receiving the IP address "102.102.102.102" as the output for both the source and destination IP addresses as shown below:

this is the output of Config::Connect("/NodeList/*/DeviceList/*/MacRx", MakeCallback(&TracePacketReceive));

trace source:

/NodeList/0/DeviceList/0/MacTx 

-6 here 

txPacket: 558 simTime: 7.66183 

Source IP: 102.102.102.102 

Destination IP: 102.102.102.102 

/NodeList/7/DeviceList/2/MacTx 

1 here 

txPacket: 558 simTime: 7.66194

 Source IP: 102.102.102.102 

Destination IP: 102.102.102.102  

/NodeList/8/DeviceList/1/MacTx 

2 here txPacket: 558 simTime: 7.66305 

Source IP: 102.102.102.102 

Destination IP: 102.102.102.102 

/NodeList/11/DeviceList/3/MacTx 

5 here txPacket: 558 simTime: 7.66416 

Source IP: 102.102.102.102 

Destination IP: 102.102.102.102 

/NodeList/12/DeviceList/3/MacTx

this is the output of

Config::Connect("NodeList/*/$ns3::Node/$ns3::OFSwitch13Device/PortList/*/$ns3::OFSwitch13Port/SwitchPortRx"

trace source :

NodeList/0/$ns3::Node/$ns3::OFSwitch13Device/PortList/0/$ns3::OFSwitch13Port/SwitchPortRx 

-6 here txPacket: 558 simTime: 7.66183 Source 

IP: 102.102.102.102 

Destination IP: 102.102.102.102 

/NodeList/7/DeviceList/2/MacTx 

1 here txPacket: 558 simTime: 7.66194

 Source IP: 102.102.102.102 

Destination IP: 102.102.102.102 NodeList/8/$ns3::Node/$ns3::OFSwitch13Device/PortList/1/$ns3::OFSwitch13Port/SwitchPortRx 

2 here txPacket: 558 simTime: 7.66305 

Source IP: 102.102.102.102

 Destination IP: 102.102.102.102 

/NodeList/11/DeviceList/3/MacTx 

5 here txPacket: 558 simTime: 7.66416 

Source IP: 102.102.102.102 

Destination IP: 102.102.102.102 NodeList/12/$ns3::Node/$ns3::OFSwitch13Device/PortList/3/$ns3::OFSwitch13Port/SwitchPortRx

but i'm expected as output to get the correct source and destination ip addresses which they are 192.168.1.1 and 192.168.1.7.

i think that the header that i peeked from the packet is empty or i made a mistake when i parsing the packet to get the ip Header so i will be thankful if anyone can help me.