Am 2011-06-06 19:07, schrieb Anssi Johansson: > One of my IPv6 NTP servers is at 2001:41d0:1:7f42::1. I started > running tcpdump on that server at 16:12:10 UTC. There's also an oddity > that the monitoring server seems to send queries which are not > recorded in the CSV. All queries were answered by my server.
I experience similar issues. I ran tcpdump on my natively connected node at 2a02:180:1:1:19:dbc6:ab03:0. These are the relevant lines from CSV (the times are in UTC): 1307383947,"2011-06-06 18:12:27",,-5,-19 1307383931,"2011-06-06 18:12:11",,-5,-14.7 1307383915,"2011-06-06 18:11:55",0.000253796577453613,1,-10.2 1307383904,"2011-06-06 18:11:44",,-5,-11.8 1307383893,"2011-06-06 18:11:33",0.00146651268005371,1,-7.1 1307383881,"2011-06-06 18:11:21",,-5,-8.6 1307383862,"2011-06-06 18:11:02",-0.00271093845367432,1,-3.8 1307383854,"2011-06-06 18:10:54",-0.000712156295776367,1,-5 1307383837,"2011-06-06 18:10:37",,-5,-6.3 And these are the corresponding packets recorded by tcpdump (the times are in UTC+2): 20:10:33.489049 IP6 2607:f238:2::11.13548 > 2a02:180:1:1:19:dbc6:ab03:0.123: NTPv3, Client, length 48 20:10:33.489049 IP6 2a02:180:1:1:19:dbc6:ab03:0.123 > 2607:f238:2::11.13548: NTPv3, Server, length 48 20:10:35.489102 IP6 2607:f238:2::11.6544 > 2a02:180:1:1:19:dbc6:ab03:0.123: NTPv3, Client, length 48 20:10:35.489102 IP6 2a02:180:1:1:19:dbc6:ab03:0.123 > 2607:f238:2::11.6544: NTPv3, Server, length 48 20:10:54.485611 IP6 2607:f238:2::11.55857 > 2a02:180:1:1:19:dbc6:ab03:0.123: NTPv3, Client, length 48 20:10:54.485611 IP6 2a02:180:1:1:19:dbc6:ab03:0.123 > 2607:f238:2::11.55857: NTPv3, Server, length 48 20:11:02.909836 IP6 2607:f238:2::11.42932 > 2a02:180:1:1:19:dbc6:ab03:0.123: NTPv3, Client, length 48 20:11:02.909836 IP6 2a02:180:1:1:19:dbc6:ab03:0.123 > 2607:f238:2::11.42932: NTPv3, Server, length 48 20:11:17.134217 IP6 2607:f238:2::11.30778 > 2a02:180:1:1:19:dbc6:ab03:0.123: NTPv3, Client, length 48 20:11:17.138217 IP6 2a02:180:1:1:19:dbc6:ab03:0.123 > 2607:f238:2::11.30778: NTPv3, Server, length 48 20:11:19.138271 IP6 2607:f238:2::11.17700 > 2a02:180:1:1:19:dbc6:ab03:0.123: NTPv3, Client, length 48 20:11:19.138271 IP6 2a02:180:1:1:19:dbc6:ab03:0.123 > 2607:f238:2::11.17700: NTPv3, Server, length 48 20:11:32.962640 IP6 2607:f238:2::11.45298 > 2a02:180:1:1:19:dbc6:ab03:0.123: NTPv3, Client, length 48 20:11:32.962640 IP6 2a02:180:1:1:19:dbc6:ab03:0.123 > 2607:f238:2::11.45298: NTPv3, Server, length 48 20:11:41.054857 IP6 2607:f238:2::11.17931 > 2a02:180:1:1:19:dbc6:ab03:0.123: NTPv3, Client, length 48 20:11:41.054857 IP6 2a02:180:1:1:19:dbc6:ab03:0.123 > 2607:f238:2::11.17931: NTPv3, Server, length 48 20:11:43.058910 IP6 2607:f238:2::11.28066 > 2a02:180:1:1:19:dbc6:ab03:0.123: NTPv3, Client, length 48 20:11:43.058910 IP6 2a02:180:1:1:19:dbc6:ab03:0.123 > 2607:f238:2::11.28066: NTPv3, Server, length 48 20:11:55.343239 IP6 2607:f238:2::11.35457 > 2a02:180:1:1:19:dbc6:ab03:0.123: NTPv3, Client, length 48 20:11:55.347239 IP6 2a02:180:1:1:19:dbc6:ab03:0.123 > 2607:f238:2::11.35457: NTPv3, Server, length 48 20:12:07.275558 IP6 2607:f238:2::11.22892 > 2a02:180:1:1:19:dbc6:ab03:0.123: NTPv3, Client, length 48 20:12:07.275558 IP6 2a02:180:1:1:19:dbc6:ab03:0.123 > 2607:f238:2::11.22892: NTPv3, Server, length 48 20:12:09.279611 IP6 2607:f238:2::11.16977 > 2a02:180:1:1:19:dbc6:ab03:0.123: NTPv3, Client, length 48 20:12:09.279611 IP6 2a02:180:1:1:19:dbc6:ab03:0.123 > 2607:f238:2::11.16977: NTPv3, Server, length 48 20:12:23.079980 IP6 2607:f238:2::11.20477 > 2a02:180:1:1:19:dbc6:ab03:0.123: NTPv3, Client, length 48 20:12:23.079980 IP6 2a02:180:1:1:19:dbc6:ab03:0.123 > 2607:f238:2::11.20477: NTPv3, Server, length 48 20:12:25.084034 IP6 2607:f238:2::11.24676 > 2a02:180:1:1:19:dbc6:ab03:0.123: NTPv3, Client, length 48 20:12:25.084034 IP6 2a02:180:1:1:19:dbc6:ab03:0.123 > 2607:f238:2::11.24676: NTPv3, Server, length 48 Whenever a single packet is received, everything is ok. Whenever two packets arrive, the monitoring rates the server as unreachable. Paul _______________________________________________ pool mailing list [email protected] http://lists.ntp.org/listinfo/pool
