IPv6 : ping6, a simple example

ICMPv6, described in the IPv6 chapter of Computer Networking: Principles, Protocols and Practice is a companion protocol for IPv6 that is used for various functions including network debugging. ping6 is a popular debugging tool that allows to verify whether a remote host is up and running. For this, it sends an ICMPv6 Echo request that contains some information and waits for an ICMPv6 Echo reply.

Paste this command into your terminal:

The password to connect is

ping6 messages

Can you infer the Identifier and the sequence fields of the ICMPv6 Echo response ?

#	Length	Summary	Status
0	48 bytes	`Internet Control Message Protocol v6`
1	48 bytes	`Internet Control Message Protocol v6`

0000  6006f53600103a40  200106a8308f0002
0010  48e995ae3a92922d  200106a830810001
0020  0000000000000002  800088ac3a830000

0000  `.õ6..:@ ..¨0...
0010  Hé.®:..- ..¨0...
0020  ...........¬:...

Internet Protocol Version 6, Src: 2001:6a8:308f:2:48e9:95ae:3a92:922d, Dst: 2001:6a8:3081:1::2
- 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)
- .... .... .... 0110 1111 0101 0011 0110 = Flow Label: 0x6f536
- Payload Length: 16
- Next Header: ICMPv6 (58)
- Hop Limit: 64
- Source: 2001:6a8:308f:2:48e9:95ae:3a92:922d
- Destination: 2001:6a8:3081:1::2
Internet Control Message Protocol v6
- Type: Echo (ping) request (128)
- Code: 0
- Checksum: 0x88ac [correct]
- Identifier: 0x3a83
- Sequence: 0

0000  6006f53600103a3d  200106a830810001
0010  0000000000000002  200106a8308f0002
0020  48e995ae3a92922d  810087ac????????

0000  `.õ6..:= ..¨0...
0010  ........ ..¨0...
0020  Hé.®:..-...¬????

Internet Protocol Version 6, Src: 2001:6a8:3081:1::2, 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)
- .... .... .... 0110 1111 0101 0011 0110 = Flow Label: 0x6f536
- Payload Length: 16
- Next Header: ICMPv6 (58)
- Hop Limit: 61
- Source: 2001:6a8:3081:1::2
- Destination: 2001:6a8:308f:2:48e9:95ae:3a92:922d
Internet Control Message Protocol v6
- Type: Echo (ping) reply (129)
- Code: 0
- Checksum: 0x87ac [correct]
- Identifier: ?
- Sequence: ?

Author(s)	Olivier Bonaventure
Deadline	Geen deadline
Submission limit	No limitation
Category tags	ipv6

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