[ntp:questions] help needed for ntpd multicast mode

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


Dave,

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

Dave

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
>>server.
>>    
>>
>
>You mentioned using ntp 4.2.0.  You can find your version's
>"broadcastdelay" documented at:
>
>http://doc.ntp.org/4.2.0/miscopt.html
>
>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.
>
>Cheers,
>Dave Hart
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>  
>




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