[ntp:questions] poll interval - Clarification! - RFC compliancequestion

David L. Mills mills at udel.edu
Thu Jun 19 19:57:17 UTC 2008


Not quite. The NTPv4 server replies with the same version as received in 
an NTP packet. The configuration version option applies only to packets 
that are sent unsolicited. Other than this, the version number plays no 
part in packet processing.


Harlan Stenn wrote:

>>>>In article <39EA5C210755754BB6F997B693820C2201B44C5E at esealmw121.eemea.ericsson.se>, anton.a.persson at ericsson.com (Anton Persson A) writes:
> Anton> We have, however, in the /etc/ntp.conf file explicitly stated that
> Anton> the daemon should communicate using NTP v3. What this means is that
> Anton> ntpd says, to to the server it is synching with, that it uses NTP v3
> Anton> (even though it is capable of v4.)  I have no idea how this affects
> Anton> the different state machines running inside the ntpd, just that the
> Anton> packet it sends out on the network state v3 instead of the default
> Anton> v4. The reasons for this is requirements from a legacy project which
> Anton> we are communicating with..
> You should not need to do this.
> When two NTP procecess 'communicate', they each offer the 'highest' version
> they know how to speak and then continue the association at the lower
> version.
> Something like:
> v4: I can talk ntpv4
> v3: I can talk ntpv3
> v4: I'm talking to you at ntpv3

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