ntpd tracks interface updates, however it does not requery
servers, when they occur. This was less than an hour ago,
at my university, the notebook boots and is not connected
to anything:

 9 Mar 08:07:17 ntpd[1510]: logging to file /var/log/ntpd
 9 Mar 08:07:17 ntpd[1510]: precision = 2.234 usec
 9 Mar 08:07:17 ntpd[1510]: Listening on interface #0 wildcard, 0.0.0.0#123 
Disabled
 9 Mar 08:07:17 ntpd[1510]: Listening on interface #1 wildcard, ::#123 Disabled
 9 Mar 08:07:17 ntpd[1510]: Listening on interface #2 bge0, 192.168.1.12#123 
Enabled
 9 Mar 08:07:17 ntpd[1510]: Listening on interface #3 lo0, fe80::1#123 Enabled
 9 Mar 08:07:17 ntpd[1510]: Listening on interface #4 lo0, ::1#123 Enabled
 9 Mar 08:07:17 ntpd[1510]: Listening on interface #5 lo0, 127.0.0.1#123 Enabled
 9 Mar 08:07:17 ntpd[1510]: Listening on routing socket on fd #26 for interface 
updates
 9 Mar 08:07:17 ntpd[1510]: kernel time sync status 2040
 9 Mar 08:07:17 ntpd[1510]: frequency initialized 3.155 PPM from 
/var/db/ntpd.drift
 9 Mar 08:07:20 ntpd[1542]: host name not found: 0.de.pool.ntp.org
 9 Mar 08:07:20 ntpd[1542]: couldn't resolve `0.de.pool.ntp.org', giving up on 
it
 9 Mar 08:07:20 ntpd[1542]: host name not found: 1.de.pool.ntp.org
 9 Mar 08:07:20 ntpd[1542]: couldn't resolve `1.de.pool.ntp.org', giving up on 
it
 9 Mar 08:07:20 ntpd[1542]: host name not found: 2.de.pool.ntp.org
 9 Mar 08:07:20 ntpd[1542]: couldn't resolve `2.de.pool.ntp.org', giving up on 
it
 9 Mar 08:07:20 ntpd[1542]: host name not found: ntp1.rz.uni-karlsruhe.de
 9 Mar 08:07:20 ntpd[1542]: couldn't resolve `ntp1.rz.uni-karlsruhe.de', giving 
up on it
 9 Mar 08:07:20 ntpd[1542]: host name not found: ntp1.rz.uni-karlsruhe.de
 9 Mar 08:07:20 ntpd[1542]: couldn't resolve `ntp1.rz.uni-karlsruhe.de', giving 
up on it
 9 Mar 08:07:20 ntpd[1542]: host name not found: ntp3.rz.uni-karlsruhe.de
 9 Mar 08:07:20 ntpd[1542]: couldn't resolve `ntp3.rz.uni-karlsruhe.de', giving 
up on it
 9 Mar 08:07:20 ntpd[1542]: host name not found: ntp4.rz.uni-karlsruhe.de
 9 Mar 08:07:20 ntpd[1542]: couldn't resolve `ntp4.rz.uni-karlsruhe.de', giving 
up on it

So ntpd has given up on all the servers listed in the ntp.conf file.

I then proceed to connect to the wireless network and proceed to log
into two VPNs:

 9 Mar 08:08:58 ntpd[1510]: Listening on interface #6 wlan0, 192.168.75.58#123 
Enabled
 9 Mar 08:09:00 ntpd[1510]: Listening on interface #7 tun0, 193.196.120.15#123 
Enabled
 9 Mar 08:09:04 ntpd[1510]: Listening on interface #8 tun1, 141.3.162.67#123 
Enabled

Over interface #8 some of the servers are actually available, but
ntpq -p still states:
No association ID's returned

Only when I restart ntpd, it operates as expected:
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
 zit-net2.uni-pa .STEP.          16 u    -  512    0    0.000    0.000   0.000
 alpha.rueckgr.a .STEP.          16 u    -  512    0    0.000    0.000   0.000
 ntp.goneco.de   .STEP.          16 u    -  512    0    0.000    0.000   0.000
+proxy4.rz.uni-k 129.13.64.17     2 u   30  128  271    2.937    2.530   1.891
+proxy2.rz.uni-k 129.13.64.17     2 u   58  128  375    3.593   -8.981   1.837
*proxy1.rz.uni-k 129.13.64.17     2 u   15  128  271    3.297    8.244   1.487

-- 
A: Because it fouls the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing on usenet and in e-mail? 
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