[ntp:questions] ntp and anycast

Rob nomail at example.com
Fri Oct 31 19:17:27 UTC 2014

Markus Moeller <huaraz at moeller.plus.com> wrote:
> Hi,
>     What do I need to consider when using an anycast IP for a NTP servers ? 
> If I remember right a client should have at least 3 better 4 ntp servers 
> configured to identify the best sources, but if you use anycast IP for a 
> server the client would have only one server configured, so how would the 
> client find out any drift, bad time source ?
> Thank you
> Markus 

When you use anycast, you probably don't worry about that.
Anycast is good for "get an approxmate time" in environments that are
more like SNTP than NTP.  E.g. to set the time of a home router.

For keeping accurate time and using the kernel phase locked loop,
anycast is worthless.

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