On 2/15/2021 12:50 AM, Ulrich Windl wrote:
>>>> Harlan Stenn <stenn@xxxxxxxxxx> schrieb am 12.02.2021 um 21:48 in Nachricht
> <cbbf785c-a591-d633-5300-802560454e8b@xxxxxxxxxx>:
>> On 2/12/2021 4:01 AM, tom petch wrote:
>>> On 11/02/2021 09:39, Dhruv Dhody wrote:
>>>> ...
>>>
>>> leaf poll {
>>> type uint8;
>>> This seems wrong to me. Looking at s.7.3
>>> Poll: 8-bit signed integer representing the maximum interval between
>>> successive messages, in log2 seconds. Suggested default limits for
>>> minimum and maximum poll intervals are 6 and 10, respectively.
>>> ie signed integer and not uint
>>
>> Why are 6 and 10 useful as suggested limits for minimum and maximum poll
>> values?
>
> Maybe because of this (man ntp.conf):
> "The maximum poll interval defaults to 10 (1,024 s), but can be increased by the
> maxpoll option to an upper limit of 17 (36.4 h). The minimum poll interval
> defaults to 6 (64 s), but can be decreased by the minpoll option to a lower limit
> of 4 (16 s)."
>
> Also (RFC): "Typical secondary servers and clients on fast LANs are within a few
> hundred microseconds with poll intervals up to 1024 seconds, which was the maximum
> with NTPv3. With NTPv4, servers and clients are precise within a few tens of
> milliseconds with poll intervals up to 36 hours."
> "A client sends messages to each server with a poll interval of 2^tau seconds,
> as determined by the poll exponent tau. In NTPv4, tau ranges from 4 (16 s) to
> 17 (36 h)."
>
> "Suggested default limits for minimum and maximum poll intervals are 6 and 10, respectively."
Then they are "Suggested default >values< for ...", not >limits<.
> Regards,
> Ulrich
--
Harlan Stenn <stenn@xxxxxxxxxx>
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