Ping triangulation

Jonathan Heiliger loco at
Mon Jul 29 23:36:22 UTC 1996

On Mon, 29 Jul 1996, Peter Lothberg wrote:

Roy <garlic at>
|} > They use the ping times to figure out which server would be closest.
|} > All the servers are not located in the same place.  The idea is that 
|} > european users may receive better service from a european server.

Peter Lothberg <roll at>
|} The network topology and geography does not match very well, I would guess
|} that the network center of Europe is likely to be somwhere on the US
|} Eastcoast.
|} Only Stockholm have multiple international E3 links....

There is still a rather high bit of latency to cross the Atlantic.  Not to
mention that within Europe, not everyone has an STM-1 backbone.  I'm under
the impression (anyone feel free to correct me :), that the majority of
the infrastructure is based on multiple E1s with some E3 connections and
perhaps a few SDH links.  One could probably take this picture and copy it
a few times to represent several other countries and/or whole continents;
remove pieces and get a picture of even more countries.

Distributing web servers to remote corners of the world can only be
characterized as a good thing.  Not to mention the added value that is
gained in localized content *and* advertising.  If the end-user is
shuffled to a 'local' server rather than the 'master' server, the end-user
is theoretically getting a higher bandwidth connection, perhaps content in
his/her local language and perhaps directed marketing.

If traffic is to be moved away from exchange points, a good way of doing
it is to move the content.  Developing a mechanism for end-users to access
that content transparently around the world is another discussion


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