Drop and Create a new packet

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  • July 4, 2005 at 11:02 am #4930
    pavankvnaidu
    Participant

      I want to modify the packet data.
      if the data is ‘abc’ i want to change it to ‘1234567’ how to do this?

      I have tried just simply modify the packet as decribed in the post,
      http://ntkernel.com/forum/viewtopic.php?t=19&highlight=modify+packet
      but it doesn’t work because, the size of the modified packet is greater than the size of original packet. In this case, only the size of original data is being transmited i.e only ‘123’ is being transmited.

      The alternate solution is to drop the actual packet and create the new packet with the same sequence number(SYN) and inject it into the stack.

      Can any one help?

      Thank you.

      July 5, 2005 at 12:42 pm #5758
      ByTE
      Participant

        With TCP protocol you MUST modify SN field of packet. No other way.

        July 6, 2005 at 9:08 am #5759
        pavankvnaidu
        Participant

          if we change the SYN of one packet, what happens to the otherpackets that are in queue?

          can you please explain it in more detail?

          July 6, 2005 at 11:24 am #5760
          ByTE
          Participant

            You must change all sequence values of packets in current TCP sequence.
            This in hard work (not really).

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