[ntp:questions] SNTP test bench

David L. Mills mills at udel.edu
Sat Feb 2 05:33:34 UTC 2008


Dag-Erling,

The monitor and rate semantics are further elaborated in the recent 
documentation posted to the web page.

Dave

Dag-Erling Smørgrav wrote:
> "David L. Mills" <mills at udel.edu> writes:
> 
>>The rate violation is caught in the MRU list, which can be retrieved
>>using ntpdc and the monlist command. When the number of clients is
>>small, the list can be retrieved over the net. When the number of
>>clients is larte, like several hundred, there are many UDP packets and
>>one or more are usually dropped. The solution at present is to run
>>ntpdc on the server machine and pipe the monlist output to a local
>>file.
>>
>>Each time a KoD is sent a counter is increased by one. Once each
>>second the counter is decreased by one. If an offending packet arrives
>>and the counter is less than 2, a KoD is sent; otherwise, the packet
>>is dropped without further action. There probably should be some
>>triage, but not without additional complexity.
> 
> 
> This is both interesting and useful, but begs the question, which was
> what "monitor" semantics are and how the parameter should be specified
> (0-1, percentage, whatever)
> 
> Also, it wouldn't hurt to copy-paste what you wrote above into the
> doc on udel.edu :)
> 
> DES




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