[ntp:questions] help needed for ntpd multicast mode

David L. Mills mills at udel.edu
Wed Dec 1 03:04:26 UTC 2010


In late versions the calibration volley is suppressed unconditionally if 
broadcastdelay is nonzero. See ntp_proto.c line 919 in ntp_dev.


Dave Hart wrote:

>On Tue, Nov 30, 2010 at 18:50 UTC, Atul Gupta <atul14.kumar at gmail.com> wrote:
>>I used broadcastdelay in my client's config, but client is still trying to
>>send unicast messages to server after receiving multicast messages from
>You mentioned using ntp 4.2.0.  You can find your version's
>"broadcastdelay" documented at:
>It reads to me like the behavior has changed in newer versions.  For ntpd
>4.2.0 (circa 2003), it appears the unicast delay calibration is always
>attempted, and the broadcastdelay value is only used if the attempt fails.  If
>you upgrade to a recent version, using specifying broadcastdelay
>short-circuits the attempt.
>Dave Hart
>questions mailing list
>questions at lists.ntp.org

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