[90355] in North American Network Operators' Group
Re: How to tell if something is anycasted?
daemon@ATHENA.MIT.EDU (Edward Lewis)
Wed May 17 13:51:23 2006
In-Reply-To: <20060516153406.I40539@sprockets.gibbard.org>
Date: Wed, 17 May 2006 13:50:46 -0400
To: nanog@merit.edu
From: Edward Lewis <Ed.Lewis@neustar.biz>
Cc: ed.lewis@neustar.biz
Errors-To: owner-nanog@merit.edu
At 15:45 -0700 5/16/06, Steve Gibbard wrote:
>The approach I settled on was to ask lots of questions, and then do some
>traceroutes to verify once I knew where to look. If I knew there was supposed
>to be a server in location x, a looking glass near location x would probably
>find it for me.
From my experience, passively detecting how something is assembled on
the Internet has gotten harder with each passing year. Whether it is
from intentional obfuscation or just evolutionary new operational
practices, you can tell a lot less about a set up now that in the
past.
What Steve says is the right thing to do. Get off-net ask questions
and then verify on-net. Not just for anycasting, for just about
anything. The network is a lot less obvious that it used to be. For
better or worse, depending on your point of view.
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Edward Lewis +1-571-434-5468
NeuStar
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