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Auteur(s) Olivier Bonaventure
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Étiquettes de catégories tcp

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TCP acknowledgements

The TCP header, shown in the TCP chapter of Computer Networking: Principles, Protocols and Practice contains an acknowledgement number.

Sequence numbers

A data transfer has started with a three-way handshake that is not shown in this trace. Can you infer the acknowledgements numbers of the two missing segments in the trace below ?

0000  d1ce04d2c9613aed  93aaa51450187080  
0010  0000000073647173  6473710a          
0000  ÑÎ.ÒÉa:í.ª¥.P.p.
0010  ....sdqsdsq.    
  • Transmission Control Protocol, Src Port: 53710, Dst Port: 1234, Seq: 3378592493, Ack: 2477434132, Len: 8
    • Source Port: 53710
      • Destination Port: 1234
        • Sequence number: 3378592493
          • Acknowledgment number: 2477434132
            • 0101 .... = Header Length: 20 bytes (5)
              • Flags
                • 000. .... .... = Reserved: Not set
                  • ...0 .... .... = Nonce: Not set
                    • .... 0... .... = Congestion Window Reduced (CWR): Not set
                      • .... .0.. .... = ECN-Echo: Not set
                        • .... ..0. .... = Urgent: Not set
                          • .... ...1 .... = Acknowledgment: Set
                            • .... .... 1... = Push: Set
                              • .... .... .0.. = Reset: Not set
                                • .... .... ..0. = Syn: Not set
                                  • .... .... ...0 = Fin: Not set
                                  • Window size value: 28800
                                    • Urgent pointer: 0
                                      • TCP payload (8 bytes)