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Re: [Ntp] Internet latency mapping project idea

"Giovane C. M. Moura" <giovane.moura@sidn.nl> Tue, 23 April 2024 10:56 UTC

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Archived-At: <https://mailarchive.ietf.org/arch/msg/ntp/3BQbdt4g21_H1tgnkhhGIRyE4J4>
Subject: Re: [Ntp] Internet latency mapping project idea
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Hi Tamme,


> After the IETF Hackathon and Meeting in Prague I had a project idea for 
> a NTP tool to measure latency and path asymmetry for synchronization 
> over the internet. Now I'm looking for feedback on how to make this tool 
> most effective.
> 

I'm  also interested in the topic, and I've some experiences with 
measurement studies.


> The tool would consists of a special NTP client, which is running on a 
> GNSS synchronized host. The client sends normal NTP requests to a set of 
> (consenting) stratum 1 servers and records all four timestamps (t1, t2, 
> t3, t4), as well as metadata about the server (such as IP, reference ID, 
> traceroute). The requests would also be send multiple times per day, 
> with different protocol versions/options, like IPv4/IPv6, 
> NTPv3/NTPv4/NTPv5, NTS/plain.


> I think the collected data could allow us to see how NTP packets are 
> handled over the wider internet. So for example if NTP without NTS is 
> prioritized, or that using IPv6 gives better or worse latency. Or if 
> higher latency also equates to worse asymmetry.


At the moment, you could partially answer your questions with Ripe Atlas 
probes[0], at least comparing IPv4 and IPv6 performance for NTP. They 
have their clocks synchronized in different ways [1].

The good thing about them is that they are 12k of them all over the 
world. And you can run NTP measurements for free. So you have a lot of 
vantage points.

Although it does not support NTS for the moment, and does not have GNSS 
client, it can offer you a baseline comparison.

For example, see section 6.1 in [2].


> Maybe the collected data could also be used to build better noise models 
> for NTP implementations, although I'm not an expert in this area.
> 
> Do you know of any previous work in this area? I would be happy about 
> any feedback on the idea.


There are some studies dealing with assymetric paths and NTP. For 
example, [3].

/giovane


[0] https://ripe.atlas.net
[1] 
https://labs.ripe.net/author/philip_homburg/ntp-measurements-with-ripe-atlas/
[2] https://dl.acm.org/doi/pdf/10.1145/3639041
[3] 
https://hal.univ-grenoble-alpes.fr/hal-02305093/file/Calibrating%20NTP.pdf

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