[atlas] Satellite based "last mile" and Atlas probes

Malte Appel already partially responded to you questions. I will try to provide more details.

Each probe has build-in measurements for 1st and 2nd hop. For your probe it is:

  *   nice view https://atlas.ripe.net/probes/1001821/#tab-builtins
  *   1st hop https://atlas.ripe.net/api/v2/measurements/1/results/?probe_ids=1001821&start=1619136000&stop=1619222399&format=json
  *   2nd hop https://atlas.ripe.net/api/v2/measurements/2/results/?probe_ids=1001821&start=1619136000&stop=1619222399&format=json

If you take your probe as an example you will notice that your first hop is your local router (Starlink dish?) and it has RTT <1ms. It's your 2nd hop which can indicate what RTT is generated by Starlink satellite connection (RTT Median Average ~30ms). I'm curious where exactly is located this 2nd hop :)

Regards,
Grzegorz

From: Ray Bellis <ray at isc.org>
Date: Friday 2021-04-23 at 10:44
To: "ripe-atlas at ripe.net" <ripe-atlas at ripe.net>
Subject: Re: [atlas] Satellite based "last mile" and Atlas probes



On 22/04/2021 20:52, Ponikierski, Grzegorz via ripe-atlas wrote:
Checking
first hop can be tricky because this first hop can be local router with
RTT <1ms and second hop can indicate that we are on satellite
connectivity. For that API for sure API must be used. Here is the full
list of build in measurements:
https://urldefense.com/v3/__https://beta-docs.atlas.ripe.net/built-in/reference.html*traceroute-5-000-6-999__;Iw!!GjvTz_vk!CGnJSJwFwnAeSTFJcu_wN5qF5pxMnHYnUY2rcHz_afOJoH0Tp49DDDQm0TvPlSQ$<https://urldefense.com/v3/__https:/beta-docs.atlas.ripe.net/built-in/reference.html*traceroute-5-000-6-999__;Iw!!GjvTz_vk!CGnJSJwFwnAeSTFJcu_wN5qF5pxMnHYnUY2rcHz_afOJoH0Tp49DDDQm0TvPlSQ$>
<https://urldefense.com/v3/__https://beta-docs.atlas.ripe.net/built-in/reference.html*traceroute-5-000-6-999__;Iw!!GjvTz_vk!CGnJSJwFwnAeSTFJcu_wN5qF5pxMnHYnUY2rcHz_afOJoH0Tp49DDDQm0TvPlSQ$<https://urldefense.com/v3/__https:/beta-docs.atlas.ripe.net/built-in/reference.html*traceroute-5-000-6-999__;Iw!!GjvTz_vk!CGnJSJwFwnAeSTFJcu_wN5qF5pxMnHYnUY2rcHz_afOJoH0Tp49DDDQm0TvPlSQ$> >
+ build in ping tests for 1^st and 2^nd hop are respectively measurement
#1 and #2.

Can you please elaborate on this?

I have a separate need (relating to an ICANN RSSAC WG) to be able to
detect high latency last mile hops but I could not identify the specific
"built-in ping tests for 1st and 2nd hop" that you described.

Were you perhaps suggesting that it was actually just the first couple
of rows of data from the built-in *traceroute* tests that hold this data?

thanks,

Ray



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