[ntp:questions] Passive client?
Danny Mayer
mayer at ntp.isc.org
Fri May 26 02:47:03 UTC 2006
Collins wrote:
> I have been reading the ntpd man pages and other documentation at the
> iesc but I have yet to find an explicit answer to the following
> question.
>
> Is it possible to configure a client so that it never attempts any
> communication with a server but simply monitors a multicast group for
> updates? If so how?
>
With broadcastclient you can specify novolley but I don't think that's
available for multicastclient unless it's undocumented. You'd also need
to disable authentication. This also has a disadvantage of not giving
you any information on round trip time, though that should be small on a
LAN.
> A possibly related question: what is the behavior of ntpd if it is
> started with a configuration file which specifies no servers?
>
Nothing. It won't do anything since it has nothing to work with. It will
sit there listening for packets and never send any out itself. Why are
you asking?
Danny
> Thanks in advance
>
> Collins
>
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