[atlas] Disabling one measurement on my probe...
Emile Aben emile.aben at ripe.net
Wed Aug 28 09:00:44 CEST 2013
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: >>  2013-08-27 17:33:29 [Root]system-critical-00435: ICMP >> fragment! From 188.8.131.52 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 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 >