[atlas] New measurement target suggestion: 6to4 anycast

Hello,

I'd like to suggest adding to the list of monitored addresses a new one:

  192.88.99.1 - 6to4 anycast IPv4 to IPv6 gateway;

https://en.wikipedia.org/wiki/6to4
https://tools.ietf.org/html/rfc3068

This could provide interesting data on what percentage of networks have this address blocked/inaccessible (resulting in broken operation of 6to4), and also what is the average latency to the closest 6to4 gateway across various countries/regions.

The next step would possibly be the collection of statistics which ASes 'see' whose 6to4 gateways, this can be inferred from the AS of the traceroute hop that is right before the 192.88.99.1 on the trace.

-- 
With respect,
Roman

~~~~~~~~~~~~~~~~~~~~~~~~~~~
"Stallman had a printer,
with code he could not see.
So he began to tinker,
and set the software free."
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