On 2018/07/06 22:30 , Rami Al-Dalky wrote: > I have a question about using the probe's list of resolvers when > creating a DNS measurement. It is unclear to me whether the probe would > send the query to all resolvers at the same time or not! Also, does the > probe send the query to all resolvers in its list or to a subset of > those resolvers? Is DNS eyeball implemented in the probes?
Hi, The Atlas DNS measurement code sends one request at a time, in the order in which the DNS resolvers are listed in /etc/resolv.conf on the probe. In addition to measuring DNS, probe can also resolve a DNS name for the target of a measurement. In that case, the stub resolver that is built into libevent is used. That stub resolver does some clever and funky stuff. I don't know the details of how DNS queries are scheduled. Philip
