[atlas] Disabling one measurement on my probe...

Hi Warren,

>> Due to much stupidity my probe lives behind 2 NATs (don't ask).
>> Anyway, one of the NATs / firewalls is suddenly throwing hissyfits and
>> logging a bunch of messages like:
>> [00005] 2013-08-27 17:33:29 [Root]system-critical-00435: ICMP
>> fragment! From 78.46.37.134 to 192.168.15.207, proto 1 (zone Untrust,
>> int ethernet3). Occurred 2 times.
>>
>> I can see the Measurement IDs that are causing this (1019675,
>> 1019728), but I have two questions:
>> 1: is there a way to disable specific measurements from a specific
>> probe and
> No there is not an easy way yet, although we are working on it and users
> will be able to add/remove probes.
> Anyhow, from what I see these two UDMs are already stopped so you
> shouldn't have any more cases with these two.
>> 2: did anything change recently with the "Ping" measurement, like the
>> packet size for example?
> Among other options[1] user can change the packet size and from what I
> see it's 48bytes for the first one 1485 for the second.

I'm the culprit here. I did start a couple of UDM measurements with
large packet-sizes to try and provide some data from what RIPE Atlas
sees when sending fragmented packets (this is a discussion on the
NANOG-list currently), and apparently your probe is one of the cases it
caught (though the log message doesn't specify if it blocked the
fragments or not).

Emile Aben
RIPE NCC

>>
>> I *did* spend some time reading the list archives and documentation,
>> but was not able to find an answer.
>>
>> W
>> P.S: And yes, I will sometime remove the NATs, but cannot until there
>> is another ISP available -- I live in a 3rd world country where any
>> broadened is a luxury, and multiple providers is more than one can
>> reasonably expect…
>>
>>
>>
>> -- 
>> "When it comes to glittering objects, wizards have all the taste and
>> self-control of a deranged magpie."
>> -- Terry Pratchett
>>
>>
>>
>>
>>
> Regards,
> Andreas
> 
> [*] You can see the different options users can set for the ping UDMs if
> you scroll a bit down on this page
> https://atlas.ripe.net/doc/udm#creating-a-new-measurement
>