[ntp:questions] NTPD concurrent clients limit

Danny Mayer mayer at ntp.isc.org
Sun Aug 17 16:25:11 UTC 2008

Richard B. Gilbert wrote:
> Danny Mayer wrote:
>> Phil wrote:
>>> I may have an application that could conceivably hit timeservers by the tens 
>>> of thousands, and potentially far far greater.  It would be from different 
>>> ip's but my concern, should that be the case, it may or could be considered 
>>> a rouge script or equipment causing an attack. I certainly don't want you 
>>> and the rest of the Calvary to be hunting me down.  If we follow through on 
>>> this project, we intend to use our own timeservers not only to keep the 
>>> Calvary at bay; I can have better and more accurate control using gps 
>>> disciplined rubidium timebases for the servers.
>> This concerns me. If you have an application that needs NTP server 
>> sources requiring those kinds of volumes you should be deploying your 
>> own NTP servers or negotiating deals with other service providers in 
>> those countries that you will be delivering your services. Neither the 
>> stratum 1 or stratum 2 or the pool servers are designed to meet the 
>> needs of high-volume private applications.
>> Danny
> If many systems at a single site are running the application, then 
> broadcast or multicast would appear to be viable solutions.

If it's site-local then yes you can do that. Phil seemed to indicate 
that this was going to be all over the Internet, but maybe I 
misunderstood what he was saying.


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