[90345] in North American Network Operators' Group
Re: How to tell if something is anycasted?
daemon@ATHENA.MIT.EDU (Edward B. DREGER)
Wed May 17 01:08:03 2006
Date: Wed, 17 May 2006 05:07:34 +0000 (GMT)
From: "Edward B. DREGER" <eddy+public+spam@noc.everquick.net>
To: nanog@merit.edu
In-Reply-To: <FCD26398C5EDE746BFC47F43EA52A173018A31CD@dino.ad.hostasaurus.com>
Errors-To: owner-nanog@merit.edu
DH> Date: Tue, 16 May 2006 18:05:10 -0400
DH> From: David Hubbard
DH> So I'm looking at a company who offers anycasted DNS;
DH> how do I tell if it's really anycasted? Just hop on
DH> different route servers to see if I can find different
DH> AS paths and then do traceroutes to see if they suggest
DH> the packets are not ending in the same location?
More or less. Latency triangulation actually is useful in this
instance, too. :-)
DH> From my routers' perspective I don't see a difference, but then
DH> I don't think I should, correct?
Think of it as multihoming, only the end "node" is geographically
distributed. The "node" may also lack "interior" routing.
Eddy
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