[ntp:questions] ntpd on dial up machine: no DNS resolving => giving up on all servers

Danny Mayer mayer at ntp.org
Sat Jun 6 22:16:59 UTC 2009


Arno Wald wrote:
> Hello,
> 
> i am using ntpd (4.2.4p6+dfsg-1; debian/sid) on a PC with dial up 
> connection. The PC is not online at boot time, but is turned online manually 
> when required via pppd.
> 
> ntpd is started at boot time and automatically can handle interfaces that 
> are brought up or down while ntpd is running since 4.2.4p0+dfsg-1. But the 
> problem is, that ntpd cannot resolve the ntp-server names at startup 
> (because the PC is offline) and gives up on them. When the ppp interface is 
> brough up, ntpd does recognize this, but does not retry to resolve the 
> servers.
> 
> I cannot find a configuration option to change this. Is there something I 
> can do to make ntpd look up the servers again when the PC is going online?
> 
> An alternative was to (re)start ntpd on ip-up instead of starting it at boot 
> time. The problem with this is that (if I am not wrong) ntpd does a big time 
> step instead of just little time adjustments once. This can make the mail 
> server dovecot stop if time is set back by too many seconds. So is there an 
> option to forbid ntpd such a big time step at startup?
> 
> Thanks,
> Arno

Soon. There code in the development branch which will help with this.
It's not as complete as it needs to be but it may help you.

Danny

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