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

"Ulrich Windl" <Ulrich.Windl@rz.uni-regensburg.de> Mon, 02 September 2019 06:42 UTC

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Date: Mon, 02 Sep 2019 08:42:48 +0200
From: Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de>
To: "ntp@ietf.org" <ntp@ietf.org>, magnus@rubidium.se, Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de>
References: <1B4A56E7-16A6-4767-9268-BCF4BEB9A247@isoc.org> <BCA949D7-7D92-43A9-9766-573559A9FC70@meinberg.de> <5D66392D020000A100033273@gwsmtp.uni-regensburg.de> <8F6BAF5F-CC7B-47B9-90FD-BD20D6ABE845@meinberg.de> <20190828103752.GI24761@localhost> <3f4b55ca-02d9-a470-229b-40860866efbf@nwtime.org> <20190828111458.GJ24761@localhost> <e50112dd-f918-1135-74c8-a738ecb70b70@nwtime.org> <55867E75-9813-466B-8E57-0E157DE5AEB9@meinberg.de> <d308b5d4-3d6e-981b-3dfc-9d5938bad78d@rubidium.se> <5D6CB84E020000A100033405@gwsmtp.uni-regensburg.de>
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Subject: [Ntp] Antw: Antw: Re: Antw: Re: Calls for Adoption -- NTP Extension Field drafts -- Four separate drafts
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>>> "Ulrich Windl" <Ulrich.Windl@rz.uni-regensburg.de> schrieb am 02.09.2019
um
08:35 in Nachricht <5D6CB84E020000A100033405@gwsmtp.uni-regensburg.de>:
>>>> Magnus Danielson <magnus@rubidium.se> schrieb am 28.08.2019 um 13:30 in
> Nachricht <d308b5d4-3d6e-981b-3dfc-9d5938bad78d@rubidium.se>:
>> I agree. If someone knocks on the door with v5 packets, reply in v5
>> form, if someone knocks on the door with v4 packets, reply in v4 form.
>> As people migrate to v5, they can start using all the benefits from it.
>> 
>> For loop‑protection, keeping a list of nodes from the source is a very
>> easy base condition to avoid routing loops, since as an announcement
> 
> But remember that a "note" is NOT "an IP address". With multi-homed hosts 

s/note/node/ # Sorry!

> you
> can have interesting synchronization loops... ;-)
> 
>> comes in, if none of the nodes in the list is oneself, you may use it,
>> where as if any of the nodes is oneself, a loop is for sure detected.
>> 
>> While the trace loop detection mechanism is sufficient in theory, it
>> does not completely solve all loop problems, as transient loops may
>> occur, but it at least avoids problems in the long term.
>> 
>> If I only had time to describe all the things I would do to enhance NTP,
>> it has a number of built‑in assumptions which is not useful or correct.
>> 
>> Cheers,
>> Magnus
>> 
>> On 2019‑08‑28 13:23, Heiko Gerstung wrote:
>>> Why not define a method in v5 that not only protects against degree 1
loops
> 
>> but maybe also against degree 2,3 or n? 
>>>
>>> This is what I meant when trying to explain that we should not stick to
the
> 
>> existing packet format with its shortcomings.
>>>
>>> Regards,
>>>    Heiko
>>>
>> 
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