Re: SNTP test bench

"David L. Mills" <mills@xxxxxxxx> 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
--
Dag-Erling Smørgrav - des@xxxxxx
.

Relevant Pages

  • Re: SNTP test bench
    ... 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 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. ... If an offending packet arrives and the counter is less than 2, a KoD is sent; otherwise, the packet is dropped without further action. ...
    (comp.protocols.time.ntp)
  • Re: Generating keys for ntpdc control
    ... so I can use ntpdc to make on the fly changes to ntpd? ... The autokey scheme is used to let NTP clients be able to verify that a NTP ... packet received from a NTP server has indeed been sent by that server and ... Those symmetric keys can also be used with ntpdc. ...
    (comp.protocols.time.ntp)
  • Re: SNTP test bench
    ... The monitor and rate semantics are further elaborated in the recent documentation posted to the web page. ... using ntpdc and the monlist command. ...
    (comp.protocols.time.ntp)
  • Re: Max number of lines that ntpdc -c monlist could display
    ... number of IPv4 addresses that can be returned to ntpdc without changing ... Can you file a bug report on this? ... "ntpdc -nc monlist output failure when amount of clients is over 512" ... limitations by firewalls not expecting such large packets. ...
    (comp.protocols.time.ntp)