[dns-operations] Anycast vs. unicast NS

David Ulevitch david at opendns.com
Mon Mar 21 14:46:52 UTC 2011

On Mar 21, 2011, at 6:29 AM, Simon Munton <Simon.Munton at communitydns.net> wrote:

> On 20/03/2011 01:00, Stephane Bortzmeyer wrote:
>> Anycast is great for reliability and resiliency, but it does not
>> optimize the RTT.
> Our experience is the same - see my previous post on this thread on 18th
> One time we had queries from Russia ending up in Tokyo, going past our nodes in RIPE, London, Ashburn & LA - so not even the shortest route to Tokyo!
> We fixed it, and now have nodes in Moscow & StP
> is the only answer to this more & more & more nodes?

No, it's having consistent transit providers across nodes, judicious peering policies that don't trombone traffic and a mix of other network policies ( peering-only nodes, etc. ) that will prevent that from happening. And fwiw, the RTT is never worse than unicast would be, by definition, as the topologically far route is still their "best" route.

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