How to measure DNS latency in Linux with tcpdump
In this case I was trying to identify which DNS resolver would be the best for my infrastructe in remote sites. Usually configuring 8.8.8.8 would be ok, yes is simple, but there are a couple of things going on in the background that deserves some checking if you want to achieve best performance. Which was my case since we have high perfomance robots in the remote sites infrastructure. So the first step is to measure right? If you don’t measure you don’t know if you are improving or even what to improve. ...