[Ntp] Antw: Re: Calls for Adoption -- NTP Extension Field drafts -- Four separate drafts

"Ulrich Windl" <Ulrich.Windl@rz.uni-regensburg.de> Wed, 28 August 2019 08:20 UTC

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Date: Wed, 28 Aug 2019 10:19:57 +0200
From: "Ulrich Windl" <Ulrich.Windl@rz.uni-regensburg.de>
To: "ntp@ietf.org" <ntp@ietf.org>,<odonoghue@isoc.org>, "Heiko Gerstung" <heiko.gerstung@meinberg.de>
References: <1B4A56E7-16A6-4767-9268-BCF4BEB9A247@isoc.org> <BCA949D7-7D92-43A9-9766-573559A9FC70@meinberg.de>
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Subject: [Ntp] Antw: Re: Calls for Adoption -- NTP Extension Field drafts -- Four separate drafts
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>>> Heiko Gerstung <heiko.gerstung@meinberg.de> schrieb am 28.08.2019 um 08:54
Nachricht <BCA949D7-7D92-43A9-9766-573559A9FC70@meinberg.de>de>:
> Hi,
> I do not support adopting all four drafts, I believe that we should either 
> integrate them into a new revision of NTP ("NTPv5") or fix them 
> problems/issues they address in that new "NTPv5" RFC. Most of the issues 
> addressed by those drafts can be easily solved by changing/expanding the NTP

> packet format for "NTPv5". 
> The "REFID" draft would be obsolete if an NTPv5 packet header for a server 
> mode packet by definition includes  a "MY_ID" field. 


Still I guess with a REFID as extension field could provide a solution
"sooner" as NTPv5, and it could be available in selected NTPv4 servers in the
near future.

> The "MAC/last extension field" draft would be obsolete if we define that 
> NTPv5 does only support Extension Fields as allowed additional data and a
> in v5 is always transported inside an extension field (the "MAC-EF" approach

> as described in the draft, for example). 

Just a random thought: Would it make sense for NTPv5 to create a completely
new packet format, or should NTPv5 be based on extension fields? Some old
clients could still try to interpret a new format with old rules (inoring the
version number). With extension fields the old clients could use NTPv5
"somewhat" (ignoring all true v5 additions), while with a new format those
clients will have a problem.


> The "I-DO extension field" draft would be something I would integrate into a

> "NTPv5" RFC as a mandatory requirement for NTP servers. 
> The "Extended Information Extension Field" draft would be obsolete if we 
> introduce either additional packet header fields in v5 or just defined a new

> EF for information that we think should be available from the server. That
> could be sent or not, based on whether the client wants it or not (indicated

> by an EF sent by that client in its request, for example). 
> Best Regards,
>    Heiko
> -- 
> Heiko Gerstung 
> Managing Director
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> On 28.08.19, 05:38 "ntp im Auftrag von Karen O'Donoghue" 
> <ntp-bounces@ietf.org im Auftrag von odonoghue@isoc.org> wrote:
>     Folks,
>     The following four drafts are four different proposals for new extension

> fields. Please review each draft and indicate whether these should be
> by the working group. I am sending them all as one set because they are all

> extension fields, but we need a response for each draft listed below. 
>     Thanks!
>     Karen and Dieter
>     1.  Network Time Protocol Extended Information Extension Field
>     https://datatracker.ietf.org/doc/draft-stenn-ntp-extended-information/ 
>     2.  Network Time Protocol I-Do Extension Field
>     https://datatracker.ietf.org/doc/draft-stenn-ntp-i-do/ 
>     3.  Network Time Protocol MAC/Last Extension Fields
>     https://datatracker.ietf.org/doc/draft-stenn-ntp-mac-last-ef/ 
>     4.  Network Time Protocol Suggested REFID Extension Field
>     https://datatracker.ietf.org/doc/draft-stenn-ntp-suggest-refid/ 
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