[atlas] Probe with ever changing upstreams/ASs?

Hi Carsten,

> Anyhow: as part of this tunnel setup, the other end of the tunnel 
> changes every 24 to 48 hours - and so does the upstream and therefore 
> also the AS of the upstream provider.

I think the short answer is: probably not highly useful. But of course 
it depends :-)

Each result is tagged with the (then) source IP of the probe, as far as 
the infrastructure knows that. For argument's sake let's say that is the 
IP where the probe is otherwise connecting from.

If that IP, because of the tunnels, changes regularly, then it's ... 
kind of ok, results from different days will vary both in RTT and in 
source IP (and in actual content. eg. DNS or TLS results). However, if 
the probe's IP stays stable but the results vary each day, then it's may 
be confusing to interpret.

At the end of the day, measurements involving this probe would give 
varying results depending on time. It's totally real, but is it useful?

Cheers,
Robert