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The secret life of DNS packets (2019)
The secret life of DNS packets: investigating complex networks.
We noticed some interesting details: most of the entries in the list corresponded to reverse DNS lookups ( PTR records) and they were all waiting for a response from 10.0.0.2, which is the IP address of the VPC resolver. Taking a closer look at the shape of the traffic coming into the DNS servers from the Hadoop job, we noticed the clients were sending the request five times for every failed reverse lookup. Some other improvements we’re considering include collecting a rolling tcpdump of DNS traffic and periodically logging the output of some of Unbound’s debugging commands, such as the contents of the request list.
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