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Author(s) Olivier Bonaventure
Deadline No deadline
Submission limit No limitation
Category tags IPv6

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IPv6 : a sequence of ping6

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.


Reorder ICMPv6 messages

Can you reorder the packets that were captured while a host was using ping6 to verify the reachability of destination 2001:6a8:3081:1::2 ?

# Length Summary Status
0 48 bytes Internet Control Message Protocol v6
1 48 bytes Internet Control Message Protocol v6
2 48 bytes Internet Control Message Protocol v6
3 48 bytes Internet Control Message Protocol v6
4 48 bytes Internet Control Message Protocol v6
5 48 bytes Internet Control Message Protocol v6

0000  6006f53600103a3d  200106a830810001  
0010  0000000000000002  200106a8308f0002  
0020  48e995ae3a92922d  8100561c3a830004  

0000  `.õ6..:= ..¨0...
0010  ........ ..¨0...
0020  Hé.®:..-..V.:...
  • 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: 0x561c [correct]
                            • Identifier: 0x3a83
                              • Sequence: 4
                              0000  6006f53600103a40  200106a8308f0002  
                              0010  48e995ae3a92922d  200106a830810001  
                              0020  0000000000000002  8000697b3a830003  

                              0000  `.õ6..:@ ..¨0...
                              0010  Hé.®:..- ..¨0...
                              0020  ..........i{:...
                              • 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: 0x697b [correct]
                                                        • Identifier: 0x3a83
                                                          • Sequence: 3
                                                          0000  6006f53600103a40  200106a8308f0002  
                                                          0010  48e995ae3a92922d  200106a830810001  
                                                          0020  0000000000000002  8000571c3a830004  

                                                          0000  `.õ6..:@ ..¨0...
                                                          0010  Hé.®:..- ..¨0...
                                                          0020  ..........W.:...
                                                          • 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: 0x571c [correct]
                                                                                    • Identifier: 0x3a83
                                                                                      • Sequence: 4
                                                                                      0000  6006f53600103a3d  200106a830810001  
                                                                                      0010  0000000000000002  200106a8308f0002  
                                                                                      0020  48e995ae3a92922d  810072593a830002  

                                                                                      0000  `.õ6..:= ..¨0...
                                                                                      0010  ........ ..¨0...
                                                                                      0020  Hé.®:..-..rY:...
                                                                                      • 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: 0x7259 [correct]
                                                                                                                • Identifier: 0x3a83
                                                                                                                  • Sequence: 2
                                                                                                                  0000  6006f53600103a3d  200106a830810001  
                                                                                                                  0010  0000000000000002  200106a8308f0002  
                                                                                                                  0020  48e995ae3a92922d  8100687b3a830003  

                                                                                                                  0000  `.õ6..:= ..¨0...
                                                                                                                  0010  ........ ..¨0...
                                                                                                                  0020  Hé.®:..-..h{:...
                                                                                                                  • 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: 0x687b [correct]
                                                                                                                                            • Identifier: 0x3a83
                                                                                                                                              • Sequence: 3
                                                                                                                                              0000  6006f53600103a40  200106a8308f0002  
                                                                                                                                              0010  48e995ae3a92922d  200106a830810001  
                                                                                                                                              0020  0000000000000002  800073593a830002  

                                                                                                                                              0000  `.õ6..:@ ..¨0...
                                                                                                                                              0010  Hé.®:..- ..¨0...
                                                                                                                                              0020  ..........sY:...
                                                                                                                                              • 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: 0x7359 [correct]
                                                                                                                                                                        • Identifier: 0x3a83
                                                                                                                                                                          • Sequence: 2