[184101] in North American Network Operators' Group

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Re: GeoIP information

daemon@ATHENA.MIT.EDU (Valdis.Kletnieks@vt.edu)
Fri Sep 25 14:35:28 2015

X-Original-To: nanog@nanog.org
To: Clay Curtis <clay584@gmail.com>
From: Valdis.Kletnieks@vt.edu
In-Reply-To: <CAG3QdWPSh6Ng7Zx5UhmVtYYOcNTaL86aHBCqhHoucpgupkeA5w@mail.gmail.com>
Date: Fri, 25 Sep 2015 14:35:20 -0400
Cc: nanog@nanog.org
Errors-To: nanog-bounces@nanog.org

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On Fri, 25 Sep 2015 13:39:22 -0400, Clay Curtis said:

> exclusively.  I have dealt with cases in which a CDN responded to a cli=
ent
> request with a resource on another continent, thus having to cross an o=
cean
> and adding considerable latency, when there was a POP on that continent=
.

And what was the root cause for the CDN to misfire that badly?

I hereby submit the hypothesis that if a CDN's data tables are so dorked =
up
that they're serving the data from the wrong continent, adding physical
location probably won't help, and may make things even worse.  (For insta=
nce,
consider a location in Alaska, where the *closest* CDN may be one in the
northwest part of Canada - specifically put there because the network is =
at the
wrong end of a satellite link.  You almost certainly want to skip that on=
e and
hit one in Seattle or someplace similar....)



> If the CDN could have LOC information that is more accurate/updated, it=
 could
> allow them to make a better decision and direct a client to a resource =
that is
> physically closer.=A0

You don't want the one that's physically closest.  You want the one that'=
s
netwise closest.



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