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Re: [Ntp] Consensus call: NTPv5 and leap second smearing

Danny Mayer <mayer@pdmconsulting.net> Sun, 02 July 2023 14:52 UTC

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Subject: Re: [Ntp] Consensus call: NTPv5 and leap second smearing
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On 6/28/23 3:55 PM, Dieter Sibold wrote:
> Dear all,
>
> at IETF 116 we decided to have two consensus calls regarding the content of the NTPv5 requirement draft. These are consensus calls that we would like to conduct to help progress the NTPv5 requirements document (https://datatracker.ietf.org/doc/draft-ietf-ntp-ntpv5-requirements/). Both consensus calls will run until July 21st 2023 and will be discussed at the next NTP wg meeting at IETF 117 in San Francisco.
>
> The second consensus call:
>
> Regarding leap second smearing:
>
> Currently, the NTPv5 requirement draft states that NTP servers should not apply leap second smearing to transmitted timestamps. Shall NTPv5 support leap second smearing? If yes, shall the NTP server apply leap smearing to the transmitted timestamps or otherwise shall the client perform leap second smearing?

I don't think that the former is workable since a server that is already 
smearing only knows about the smeared time. Since leap seconds are going 
away and information about smearing should be in an extension field so 
that a receiving server can decide to reject a smeared packet or one 
with a different smearing algorithm that it wants to follow.

Danny

>
>
> Greetings
> Karen and Dieter
>
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