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.

Paste this command into your terminal:

The password to connect is

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  úÎ°..... ..¨0...
0020  Hé.®:..-.»óÐ¢»¶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)

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

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