[atlas] Using Atlas for Monitoring of Anycast DNS

Looks like a nice tool. Thanks for the hint.
Klaus

Am 16.01.2020 um 16:45 schrieb Stephane Bortzmeyer:
> On Thu, Jan 16, 2020 at 04:33:47PM +0100,
>  Klaus Darilion <klaus.mailinglists at pernau.at> wrote 
>  a message of 48 lines which said:
> 
>> - analyze the probe locations (ie. country, continent)
> 
> Instead of analyzing it afterwards, why not directly asking probes on
> the place you're interested in?
> 
> I often use NSID to watch anycast servers, indeed:
> 
> % blaeu-resolve --requested 100 --area West --nameserver $(dig +short +nodnssec d.nic.fr A) --type SOA --nsid --displayrtt fr
> Nameserver 194.0.9.1
> [NSID: b'dns.th2.nic.fr' nsmaster.nic.fr. hostmaster.nic.fr. 2225269298 3600 1800 3600000 5400] : 34 occurrences Average RTT 146 ms
> [NSID: b'dns.fra.nic.fr' nsmaster.nic.fr. hostmaster.nic.fr. 2225269298 3600 1800 3600000 5400] : 3 occurrences Average RTT 100 ms
> [NSID: b'dns.nyc.nic.fr' nsmaster.nic.fr. hostmaster.nic.fr. 2225269298 3600 1800 3600000 5400] : 35 occurrences Average RTT 56 ms
> [NSID: b'dns.ix1.nic.fr' nsmaster.nic.fr. hostmaster.nic.fr. 2225269298 3600 1800 3600000 5400] : 4 occurrences Average RTT 116 ms
> [TIMEOUT] : 2 occurrences Average RTT 0 ms
> [NSID: b'dns.mrs.nic.fr' nsmaster.nic.fr. hostmaster.nic.fr. 2225269298 3600 1800 3600000 5400] : 10 occurrences Average RTT 156 ms
> [NSID: b'dns.ams.nic.fr' nsmaster.nic.fr. hostmaster.nic.fr. 2225269298 3600 1800 3600000 5400] : 8 occurrences Average RTT 101 ms
> [NSID: b'dns.lon.nic.fr' nsmaster.nic.fr. hostmaster.nic.fr. 2225269298 3600 1800 3600000 5400] : 2 occurrences Average RTT 154 ms
> [nsmaster.nic.fr. hostmaster.nic.fr. 2225269297 3600 1800 3600000 5400] : 1 occurrences Average RTT 24 ms
> Test #23843409 done at 2020-01-16T15:43:10Z
> 
> Note the wonders of BGP: only a minority of probes use the instance in
> New York City (the fastest one) :-(
> 
> Note also that the last result comes from a transparent proxy,
> redirecting to a cache.
>