[ntp:questions] pool.ntp.org : IPv6 monitoring seems broken

Erwan David erwan at rail.eu.org
Sat May 18 17:25:47 UTC 2013


Hi,

Looking at my ntp sever stats in the pool
( http://www.pool.ntp.org/user/edavid ), I see the IPv6 address is not
reached by monitoring station. However IPv4 is same machine, and works.

I tried a ntpdate -d and got following result :

bibi:~ % ntpdate -d 2a01:e0b:2070::1
18 May 19:22:05 ntpdate[10782]: ntpdate 4.2.6p5 at 1.2349-o Sat May 12 09:54:56 UTC 2012 (1)
transmit(2a01:e0b:2070::1)
receive(2a01:e0b:2070::1)
transmit(2a01:e0b:2070::1)
receive(2a01:e0b:2070::1)
transmit(2a01:e0b:2070::1)
receive(2a01:e0b:2070::1)
transmit(2a01:e0b:2070::1)
receive(2a01:e0b:2070::1)
server 2a01:e0b:2070::1, port 123
stratum 3, precision -23, leap 00, trust 000
refid [2a01:e0b:2070::1], delay 0.05002, dispersion 0.00027
transmitted 4, in filter 4
reference time:    d5423737.817eb1be  Sat, May 18 2013 19:21:59.505
originate timestamp: d5423743.32b4530d  Sat, May 18 2013 19:22:11.198
transmit timestamp:  d5423743.300bddcc  Sat, May 18 2013 19:22:11.187
filter delay:  0.05142  0.05002  0.05087  0.05188 
         0.00000  0.00000  0.00000  0.00000 
filter offset: -0.00267 -0.00312 -0.00283 -0.00284
         0.000000 0.000000 0.000000 0.000000
delay 0.05002, dispersion 0.00027
offset -0.003128

18 May 19:22:11 ntpdate[10782]: adjust time server 2a01:e0b:2070::1 offset -0.003128 sec


Thus it seems the server works in IPv6

I fear there is a routing problem for IPv6 monitoring

And seeing there are 20 IPv6 servers less in fr.pool.ntp.org is not a
surprise for me, I remarked several servers in this range (Illiad,
french ISP)



-- 
Les simplifications c'est trop compliqué



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