On Wed, Jun 27, 2012 at 15:31 UTC, Anssi Johansson wrote:
> Try querying from an unprivileged port and you'll see a problem:
>
> [anssi@tursas tmp]$ /usr/sbin/ntpdate -qu 2001:470:7:104::2
> server 2001:470:7:104::2, stratum 0, offset 0.000000, delay 0.00000
> 27 Jun 18:29:23 ntpdate[18085]: no server suitable for synchronization found

I repeated Anssi's test, using ntp-dev sntp with and without
-r/--use-reserved-port:

hart@psp-os1> sudo svcadm disable ntp
hart@psp-os1> sudo /usr/local/libexec/sntp -r 2001:470:7:104::2
sntp [email protected] Mon Jun 18 05:20:41 UTC 2012 (1)
2001:470:7:104::2 no response after 5 seconds
hart@psp-os1> sudo svcadm enable ntp

hart@psp-os1> /usr/local/libexec/sntp 2001:470:7:104::2
sntp [email protected] Mon Jun 18 05:20:41 UTC 2012 (1)
Can't open KOD db file /var/db/ntp-kod for writing!
2012-06-27 18:16:38.739856 (+0000) +0.00728 +/- 0.000237 2001:470:7:104::2 s1
hart@psp-os1>

That seemed to confirm the source port made a difference, but a few
more tests suggested otherwise -- I saw it succeed with a reserved
port, and fail without.  I think there's packet loss at the root of
the problem.

Good luck,
Dave Hart
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