[dns-operations] Storm on the DNS

Mark Andrews marka at isc.org
Tue Dec 1 03:52:30 UTC 2015

In message <5969BD85-0375-4727-BA8E-9C5AF5496216 at gmail.com>, "Song Linjian (Dav
ey)" writes:
> Shocked!
> One question. In the monitoring page the red block means unanswered
> packets ratio >70%, right ? I wondering the root server instance in that
> red region is up or down? if it is still up, the queries can not be
> routed to other server where the the probes shows green. In that case the
> merit of anycast dose not work.
> Davey

No.  It isolates the attack.  Taking overwhelmed servers down will
resulting in cascading failures.

Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org

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