ethernet packet

[Marco Cruz]

Hello to all,

I'm trying to build a ethernet packet, can someone tell or give me an example of how can I do this?

Regards,
Marco

[Marco Cruz]

Hi,

Or maybe add data to a packet and send the packet between nodes.

Can someone give some tip on how to do this.

Regards,

Marco

[Shane Tuohy]

Hello Marco, 

To add data to a node you can add a tag to the packets and read them at the other end.

http://www.nsnam.org/docs/release/3.10/manual/html/packets.html#adding-and-removing-tags

If you wanted to change the Ethernet header implementation, you would have to edit the source code of ns3, the Ethernet header implementation is contained at ns-3-dev/src/network/utils/ethernet-header.cc 

Regards,

Shane

[Marco Cruz]

Hello to all,

I have created a function, based on given in ns-3 repository, where I create a packet and send the packet by a socket.

SendPacket (void)
{
stringstream msg;
msg << "my payload";
Ptr<ns3::Packet> packet = Create<Packet> ((uint8_t*) msg.str().c_str(), msg.str().length());
std::cout << packet;
m_socket->Send (packet);

if (++m_packetsSent < m_nPackets)
{
  ScheduleTx ();
}
}

If I want to put some bits in the payload of an ethernet packet, for example only 000 in the firts 3 bits of the payload, the rest of the content I do not care, can someone tell me if this is possible to do in ns-3, and if possible give me some guide.

Thanks,

Best Regards,

Marco

[Marco Cruz]

I have created the stringstream msg to put a message in the packet. In a ethernet frame like the picture - https://learningnetwork.cisco.com/servlet/JiveServlet/showImage/2-235887-109833/Capture.JPG - we have the data field also called payload field where we can send the data that we want

SendPacket (void)

{
 stringstream msg;
 msg << "my payload"; 

 Ptr packet = Create ((uint8_t*) msg.str().c_str(), msg.str().length()); 

 m_socket->Send (packet);
 if (++m_packetsSent < m_nPackets)
 {
 ScheduleTx ();
 }

} .

So if I want to put some bits in the Data/payload field of an ethernet packet, for example only 000 in the firts 3 bits, the rest of the content I do not care, can someone tell me if this is possible to do in ns-3, and if possible give me some guide.

My doubt is How can I put 000 in the first bits of the data/payload field of the packet?

Can someone please advise me, all comment will be very appreciated

Best Regards,

Marco Cruz

On Wednesday, June 13, 2012 12:16:30 PM UTC+1, Marco Cruz wrote:

On Wednesday, June 13, 2012 12:16:30 PM UTC+1, Marco Cruz wrote:

On Wednesday, June 13, 2012 12:16:30 PM UTC+1, Marco Cruz wrote:

On Wednesday, June 13, 2012 12:16:30 PM UTC+1, Marco Cruz wrote: