[Ntp] Antw: Re: Antw: [EXT] Re: I-D Action: draft-ietf-ntp-using-nts-for-ntp-27.txt

[Ulrich Windl <[e-mail]>]

>>> Ragnar Sundblad <[e-mail]> schrieb am 27.03.2020 um 08:53 in Nachricht
<[e-mail]>:

> 
>> On 27 Mar 2020, at 08:33, Ulrich Windl <[e-mail]> 
> wrote:
>> 
>>>>> Miroslav Lichvar <[e-mail]> schrieb am 26.03.2020 um 15:01 in
>> Nachricht
>> <5022_1585231330_5E7CB5E2_5022_507_1_20200326140143.GD9039@localhost>:
>>> On Thu, Mar 26, 2020 at 02:01:16PM +0100, Ragnar Sundblad wrote:
>>>> Oh, so you think there is a risk that both the KE negotiation works
>>>> and at least one NTP requests works, and soon thereafter the
>>>> connection breaks, frequently?
>>>> I am not sure why that would happen very often, but if it did, there
>>>> Should at least be 8 NTP requests (until the client has exhausted its
>>>> cookies) until it contacts the KE server again.
>>> 
>>> Rate limiting of NTP packets in some networks is a major issue, which
>> 
>> Maybe the next NTP specification should talk about the QoS bits.
> 
> I heard this story about a larger networking equipment company that had
> some internal bandwidth problems (quite surprisingly, but I suppose
> there was a good reason), so they started to use QoS internally, and
> priorities e.g. VoIP traffic to not have them break up.
> Since most of the employees were networking savvy, of course they
> started to run all their traffic from their own machines with highest
> possible priority. When they all did that, they were back where they
> had started.

That the issue with all priorities (like process priorities, print job priorities, etc.): You tell the system what you want, and the system tries to fulfill your request.
Probably the system only works if either it's all used by a single authority, or if priority is more expensive ;-)

On my personal home router VoIP has high priority, while file downloads do not. So _I_ can manage my bandwidth the way I want it. Once the packets go to the ISP, I don't hve control what will happen.
Still I think it's a concept that should be used, even if there is no guarantee that it's effective. (like the mouth-and-nose masks in time of Corona virus)

> 
> I think it is hard to make QoS work in anything but extremely
> controlled environments.

I agree that is MIGHT help ;-)

[...]

Regards,
Ulrich