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Re: Akamai Edgekey issues ?

daemon@ATHENA.MIT.EDU (Patrick W. Gilmore)
Tue Sep 3 10:37:56 2013

From: "Patrick W. Gilmore" <patrick@ianai.net>
In-Reply-To: <31899578.5997.1378216700314.JavaMail.root@benjamin.baylink.com>
Date: Tue, 3 Sep 2013 10:37:48 -0400
To: NANOG list <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org


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On Sep 03, 2013, at 09:58 , Jay Ashworth <jra@baylink.com> wrote:
>> From: "Matthew Petach" <mpetach@netflight.com>
>> On Mon, Sep 2, 2013 at 7:33 PM, Jorge Amodio <jmamodio@gmail.com> =
wrote:
>>=20
>>> Here is another bit of data... www.apple.com not reachable from a
>>> machine
>>> using Google's NS, reachable from an iPad using TWC NS
>>>=20
>>> IP addresses returned by each are different ... could be load
>>> balancing, or
>>> creative (broken) traffic engineering
>=20
>> Far more likely to be simply due to Akamai
>> localizing the IP addresses to be as "close"
>> to the resolving nameserver as possible;
>> so, when using Google DNS, you end up
>> at an Akamai node "close" to the Google
>> DNS server; when using the TWC nameservers,
>> you end up pointing to an Akamai node closer
>> to those TWC nameservers.
>>=20
>> Not a case of "broken" traffic engineering at all.
>=20
> Sure it is.=20
>=20
> It's assuming that the geographic location of a customer resolver =
server
> has anything whatever to do with the geographic location of the end =
node,
> which it's not in fact a valid proxy for.

It isn't? How wrong is this assumption? Be specific. How far off is it, =
for how many users?

Perhaps look at the other side. Assumptions must be made. What =
assumptions would be better in the real world? What percentage of users =
are "closer" to anycast nodes? What are the real-world performance =
differences using this method vs. other methods?

Saying "not in fact a valid proxy" without hard data is not useful. What =
data do you have to prove your thesis?

Akamai seems to perform well for the vast majority of users. Or so I =
believe, but I fully admit I am biased. :)

That said, always happy to be educated. If you have data, let us know.

--=20
TTFN,
patrick


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