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Author(s) Olivier Bonaventure
Deadline Καμία προθεσμία
Submission limit No limitation
Category tags ipv6

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IPv6 : the next header -- TCP version

The IPv6 header, shown in the IPv6 chapter of Computer Networking: Principles, Protocols and Practice contains a Next Header field that usually indicates the protocol used for the packet payload.


Next Header for a packet carrying a TCP segment

Can you infer the Next Header field of this packet knowing that it contains a TCP segment.

# Length Summary Status
0 107 bytes Transmission Control Protocol, Src Port: 443, Dst Port: 62416, Seq: 2730211067, Ack: 1456042411, Len: 35  

0000  600000000043??35  2a032880f01b0001  
0010  faceb00c00000001  200106a8308f0002  
0020  48e995ae3a92922d  01bbf3d0a2bbb6fb  
0030  56c971ab801801a6  000000000101080a  
0040  78b9bd42473e3218  170303001ebd9d48  
0050  612e5413b7ff82f0  d3c020f92b5388db  
0060  e25877c169dce92d  438b6d            

0000  `....C?5*.(.ð...
0010  úΰ..... ..¨0...
0020  Hé.®:..-.»óТ»û
0030  VÉq«...¦........
0040  x¹½BG>2......½.H
0050  a.T.·ÿ.ðÓÀ ù+S.Û
0060  âXwÁiÜé-C.m     
  • Internet Protocol Version 6, Src: 2a03:2880:f01b:1:face:b00c::1, Dst: 2001:6a8:308f:2:48e9:95ae:3a92:922d
    • 0110 .... = Version: 6
      • .... 0000 0000 .... .... .... .... .... = Traffic Class: 0x00 (DSCP: CS0, ECN: Not-ECT)
        • .... 0000 00.. .... .... .... .... .... = Differentiated Services Codepoint: Default (0)
          • .... .... ..00 .... .... .... .... .... = Explicit Congestion Notification: Not ECN-Capable Transport (0)
          • .... .... .... 0000 0000 0000 0000 0000 = Flow Label: 0x00000
            • Payload Length: 67
              • Next Header: TCP (?)
              • Hop Limit: 53
                • Source: 2a03:2880:f01b:1:face:b00c::1
                  • Destination: 2001:6a8:308f:2:48e9:95ae:3a92:922d
                  • Transmission Control Protocol, Src Port: 443, Dst Port: 62416, Seq: 2730211067, Ack: 1456042411, Len: 35
                    • Source Port: 443
                      • Destination Port: 62416
                        • Sequence number: 2730211067
                          • Acknowledgment number: 1456042411
                            • 1000 .... = Header Length: 32 bytes (8)
                              • Flags: 0x018 (PSH, ACK)
                                • 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: 422
                                                    • Urgent pointer: 0
                                                      • Options: (12 bytes), No-Operation (NOP), No-Operation (NOP), Timestamps
                                                        • TCP Option - No-Operation (NOP)
                                                          • Kind: No-Operation (1)
                                                          • TCP Option - No-Operation (NOP)
                                                            • Kind: No-Operation (1)
                                                            • TCP Option - Timestamps: TSval 2025438530, TSecr 1195258392
                                                              • Kind: Time Stamp Option (8)
                                                                • Length: 10
                                                                  • Timestamp value: 2025438530
                                                                    • Timestamp echo reply: 1195258392
                                                                  • TCP payload (35 bytes)