[dns-operations] new public DNS service: 9.9.9.9

[Ray Bellis]

On 21/11/2017 16:12, Stephane Bortzmeyer wrote:

> RTT measurement is also a good idea. If Google Public DNS suddenly
> gets much closer, it may mean Google added a server… or that your ISP
> hijacked 8.8.8.8

It was observed during RIPE that DNS lookups to F root from the Conrad
hotel's network were being intercepted, although traceroutes were not.

It was possible to observe this (among other means) by seeing that the
ping RTT was much higher than the DNS RTT.

Ray