[atlas] IPv6 ICMP - denied packets

On 2014.06.23. 23:01, Joachim Tingvold wrote:

> It seems to me that the Atlas-probe sends quite some amount of 
> ICMPv6-packets to the root DNS-servers (and even Atlas' own boxes),
> that are being returned with errors. Why does the probe do this, and
> does it actually rely on these replies?

Besides the technicalities of firewall rules: all probes are automatically
involved in measurements towards root DNS servers (ping/trace/DNS) and
pieces of the infrastructure (ping/trace). We use this data to establish
baselines about the probe's capabilities and to power the maps available
on the site.

Many probes report problems in one way or another; we are far beyond the
point where we can rely on all (or a set of carefully selected) probes to
supply useful data.

Regards,
Robert