[atlas] Case sensitive DNS queries from the probe

Hi Wilfried,

On 2015/08/06 12:44 , Wilfried Woeber wrote:
> Is there any intelligence available about the percentage (or type) of responders
> answering with the "correct" camel case?

I'm running measurement 1666409 which asks for 'WwW.rIpE.nEt.'. In
addition it sets the DO flag.

Looking at a download of 'latest', I got the following results:
Total number of probes: 8267
Total number of perfect probes: 6780
Total number of probes with bad Qname: 320
Total number of probes with FORMERR: 447
Total number of probes with REFUSED: 74
Total number of probes with SERVFAIL: 15
Total number of probes with no answers: 5
Total number of probes with EDNS0 in Answer: 86
Total number of probes with no result (timeout): 609

So 8267 probes are active and 6780 returned the correct results for all
of their resolvers.

The other statistics are per resolver. So a single probe may trigger
more than one error. I'm surprised by the high number of FORMERRs.
Finding EDNS0 records in the Answer section is also fascinating.

>From other statistics, we find that about 300 probes cannot perform HTTP
measurements due to DNS lookup failures.

Philip