[atlas] Support for arbitrary DNS queries
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Gil Bahat
gil at magisto.com
Sat Dec 26 11:31:04 CET 2015
Thank you very much, makes perfect sense. Can we increase the timeout somehow or specify it as a tunable query parameter? I find the OARC tester highly useful in conjunction with RIPE ATLAS. On Dec 26, 2015 12:24 PM, "Anand Buddhdev" <anandb at ripe.net> wrote: > On 24/12/15 10:59, Gil Bahat wrote: > > Dear Gil, > > > Unfortunately, this doesn't seem to work so well either: > > https://atlas.ripe.net/measurements/3115499/ > > Can anyone here help me figure out why almost all requests end up being > > null and only very few of them show up the resultant TXT record? > > The OARC reply-size tester works by sending a recursive resolver a > series of CNAME records to follow. If the resolver has no problems, then > it follows the chain quickly, and gets a result. However, if there are > path MTU issues, for example, these queries time out. In this case, a > resolver will take a long time to come back with the result. > > The RIPE Atlas DNS measurements all time out after 5 seconds, and this > isn't enough time to always get results from the reply-size tester. This > is most likely the reason why most of your results are empty, with a > "timeout" error. > > Regards, > Anand > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://lists.ripe.net/ripe/mail/archives/ripe-atlas/attachments/20151226/069bdfa9/attachment.html>
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