Dear RIPE Atlas users,
Some of you may remember earlier discussions about this topic. We’re now
ready to enable a feature to address this issue.
Supporting each probe requires resources from the system; at the same
time having too many probes in the same network and location does not
provide much new information (that is, more probes in the same location
or network would provide similar measurement results). Therefore we have
controls in place to limit the amount of /software/ probes that are
connecting from particular networks:
1. Each probe host can connect up to 2 software probes from the same IP
address.
2. Each probe host can connect up to 4 software probes from the same IP
prefix (as seen in BGP).
3. At most 32 (or 64) probes from the same IPv4 (or IPv6) prefix (as
seen in BGP), regardless of the host.
Software probes that connect from networks beyond these limits will not
be allowed to connect, unless and until other software probes drop out.
Note that we may also adjust the particular maximums over time.
We realise that in some cases multiple probes belonging to the same user
can come seemingly from the same network, violating rule 2 (mostly), yet
they arguably still provide enough value for the community. This may be
for example because they are in fact geographically widely distributed.
In such a case the host can reach out to us via [email protected] with an
explanation and we will consider relaxing this limit.
While in the past we observed surprising corner cases, the particular
limits described above are set partially taking into account the current
software deployment. Therefore only a handful of probe hosts should be
impacted by this (as I write this, 71 probes from 13 hosts). As I
mentioned above, we’re open to adjust the limits if needed.
Regards,
Francesco Iannuzzelli
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