[atlas] a link for comparing DNS resolvers

Folks, 

FYI, Nick Kernan, my Masters student, has deployed a web portal that facilitates the comparison between various DNS resolvers, including ISP-provided and some influential publicly available resolvers (Google’s public DNS, OpenDNS, Quad9, and Cloudflare).  The comparison is based on two factors: the latency of DNS resolutions and the latency of TCP handshake with the CDN edge server selected through a given resolver.  The results are based on recurrent monthly measurements from RIPE Atlas probes that have both IPv4 and v6 connectivity, have an ISP-provided resolver available for comparison, and which meet certain requirements regarding probe versions and reliability.  You can specify the desired month of measurement, a region of interest, and the CDNs to analyze.  You can access Nick’s portal through https://dns-web-portal.netlify.app/ <https://dns-web-portal.netlify.app/>

The details of the methodology are in Nick’s thesis, which awaits some copyright permissions before being made publicly available.  In the meantime, Nick (cc’ed) and I would be happy to answer any questions. 

Regards,
—Misha Rabinovich
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