Bug#408219: [pkg-ntp-maintainers] Bug#408219: ntpd giving up on eth0 before it is initialized

[Erik Thiele]

Am Dienstag, 10. April 2007 22:27 schrieben Sie:
> Erik Thiele wrote:
> > the problem now is that the dhclient sets networking parameters after
> > ntpd has already started. dhclient won't restart ntpd because
> > configuration hasn't changed.
>
> So what is the actual problem?  ntp.conf.dhcp is not created, or it
> doesn't contain the right information, or ntpd is not restarted?

ntpd is not restarted is the problem.

>
> > this way ntpd will fail on the ip
> > adress because the ethernet is down.
>
> Why would the ethernet be down after calling dhclient?  An why is that
> ntpd's fault?

the ethernet was down before dhclient. ntpd decided that the ntp host is down, 
and will not rethink this decission just because the ethernet gets up at some 
point in time.


1)  from a former run i have correct data in ntpd.conf.dhcp

2)  ntpd is running, but networking is not yet brought up, dhcp requests are 
not yet replied by the server.

3) ntpd thus tries to contact my old ntp.my.lan server, and finds out that 
this does not work. it now decides that the server is broken.

4) dhclient activates networking and finds out that ntpd.conf.dhcp is not 
changed, so he does not restart ntpd

5) but ntpd has already decided that the ethernet does not work and will never 
rethink it's decission and stay in this mode forever:

ntpq -p
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
 wo.x.lan .INIT.          16 -    -   64    0    0.000    0.000   0.000

6) i manually restart ntpd and it instantly works.


----> if the configuration file ntpd.conf.dhcp has not changed on dhcp 
startup, then anyway ntpd has to be restarted because the actual difference 
between before and after dhclient run is that before the ethernet is down and 
the host unreachable, and afterwards the ethernet is up and the host is 
reachable.



cya
erik