[atlas] Case sensitive DNS queries from the probe
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Wilfried Woeber
woeber at cc.univie.ac.at
Thu Aug 6 12:44:42 CEST 2015
Hi Philip, thanks for the explanation! Is there any intelligence available about the percentage (or type) of responders answering with the "correct" camel case? Thanks, Wilfried On 2015-07-29 15:21, Philip Homburg wrote: > On 2015/07/29 15:13 , Yang Yu wrote: > > Looking through DNS queries log I saw tons of queries from the probe >> for case sensitive names. Can someone please enlighten me what the >> possible use cases are? >> >> query: wWw.FacebOOK.COm IN A > > Many years ago there was a proposal for stub resolvers to perform case > mangling in DNS requests to obtain increased protection against spoofing > attacks. > > This never became popular but is implemented in the stub resolver in > libevent, which is used by the measurement code on the probes. > > Then net effect is that probes will send these types of queries whenever > the measurement code needs to look up a DNS name to obtain a target's IP > address. > > Philip
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