[ntp:questions] General ntp architecture question

Richard B. Gilbert rgilbert88 at comcast.net
Mon Aug 2 20:30:17 UTC 2010


Terje Mathisen wrote:
> unruh wrote:
>> On 2010-08-02, konsu<konrad.azzopardi at gmail.com>  wrote:
>>> Thanks for your answers. Actually I do not know what are the criteria
>>> to consider in deciding time requirements. This is a bank , we will
>>> deploy VOIP soon and we have some dealers connected to reuters
>>> network  {I am checking whether they have their own time sync}....so
>>> for the rest, I do not see any reason why synchronization to the
>>> internet would be an issue.
>>
>> BEcause financial transactions are often time sensitive. It would be
>> embarassing if your clocks were 7 hours off, and some crooks knew this.
>> I suspect you could be thoroughly defrauded if that were the case.
> 
> Much worse:
> 
> If you have any kind of trading department, then it is almost certainly 
> a requirement to have an auditable UTC clock reference.
> 
> I suggest you do as Rob and David suggest, i.e. get yourself one or more 
> GPS-based Stratum 1 clocks, then define 4-6 primary servers which use 
> this/these GPS clocks plus a few internet servers as backup.
> 
> All the rest of your servers can then use the same ntp.conf file, with a 
> 'server a.b.c minpoll 4 iburst' line for each of your primary servers.
> 

The last time I looked, the driver for a GPS clock automagically set 
MINPOLL=4.

> For our corporate network this is effectively what I did, except that by 
> using FreeBSD on standard 1U servers with GPS timing receivers, I got 
> sufficient performance so that I could avoid the intermediate layer:
> 
> Every single unix/linux server use all 6 FreeBSD (a pair in each of our 
> 3 main geographic centers) systems as servers.
> 
> Before I did this, both the trading departments and the security 
> operations had their own "black box" GPS/NTP servers.
> 
> Terje




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