[ntp:questions] Re: Passive client?

Terje Mathisen terje.mathisen at hda.hydro.com
Wed May 24 15:01:57 UTC 2006

Richard B. Gilbert wrote:
> 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?
> I don't believe it's possible.  Ntpd needs to exchange packets even when 
> acting as a broadcast or multicast client.  That is necessary to 
> establish a value for the round trip packet delay.  Once the client 
> determines the delay, it will shut up and listen.

I believe you can do this, using a special configuration command, 
(possibly 'novolley' ?) to avoid the initial exchange.

- <Terje.Mathisen at hda.hydro.com>
"almost all programming can be viewed as an exercise in caching"

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