UK IPv6 Council Spring 2020: Incorrect Working IPv6 Clients & Networks

I did a short presentation at the spring 2020 roundtable of the UK IPv6 Council. The talk was about a case study I did with my NTP server listed in the NTP Pool project: For 66 days I captured all NTP requests for IPv6 and legacy IP while analyzing the returning ICMPv6/ICMPv4 error messages. (A much longer period than my initial capture for 24 hours.) Following are my presentation slides along with the results.

Note that this post is one of many related to IPv6. Click here for a structured list.

At first, here are the slides (PDF):

If you’re only interested in the mere results, here is a short summary:

  • dual-stacked public stratum 1 NTP server at respectively
  • listed with 10 Mbps for each Internet Protocol at the NTP Pool
  • captured for 66 days
  • note: only 1 out of 5 DNS names from * is handing out AAAA records
  • but there are roughly 2x more IPv4 servers in the pool
Number of NTP Packets
Distribution of ICMP Errors
Distribution NTP Clients

PS: A more detailed version of this presentation was initially planned for TROOPERS 20, which was canceled for obvious reasons. ;( Maybe I am re-running this study again (for a longer period?) and will submit this talk for #TR21. It would have more details about the capturing process, the tools used for analyzing the messages (tshark among others), and further strange investigations.

Photo by James Lee on Unsplash.

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