[atlas] packet loss seen by probes to labs.ripe.net?

On 2011.11.02. 17:19, Wilfried Woeber, UniVie/ACOnet wrote:
> Dear Atlas Team,
> 
> it looks like many (or even most/all?) of the probes seem to "seen" an
> increasing rate of packet loss to destination labs.ripe.net (on IPv4).
> 
> The problem(?) seems to have started around Week 41 and gets worse since.
> 
> Could the Atlas Team have a look at that?
> 
> Thanks,
> Wilfried.

Hi,

The preliminary answer is that there is ICMP rate limiting close to the Labs
servers. The more probes execute ping measurements, the more often they
trigger the limiting. Since the network grew continuously in the past weeks
(and before), rising failure rates per probe can be expected.

I'll try to confirm this with people who know more about the Labs
architecture. But if I'm right (I think I am), then Atlas is measuring
precisely what it should... and as a by-product, also its own growth :-)

Regards,
Robert