On Tue, 9 Mar 2010, Dominic Fandrey wrote:
 > 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.

Yes, but it looks more like name service that's not operating, ntpd 
seems to be doing its best but can't resolve the hostnames?

 > 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

I've always had to restart named after losing / regaining an interface, 
most noticeably after a suspend/resume (eg a low battery suspend), so I 
run /etc/rc.d/named restart from rc.resume.  This looks like a similar 
issue perhaps, though I don't see why restarting only ntpd would fix it.

HTH, Ian
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