[LUAU] Using a 3rd party DNS providers effects routing from CDN's?

[Julian Yap]

Just to confirm.

Using RR's DNS to look up an Akamai server:
$ host a9.g.akamai.net
a9.g.akamai.net has address 24.143.203.19
a9.g.akamai.net has address 24.143.203.35

This corresponds to RR block:
$ whois 24.143.203.19
[Querying whois.arin.net]
[Redirected to ipmt.rr.com:4321]
...
network:IP-Network:24.143.192.0/19
network:IP-Network-Block:24.143.192.0 - 24.143.223.255
network:Organization;I:Road Runner Commercial

Using Google DNS:
$ host a9.g.akamai.net 8.8.8.8
Using domain server:
Name: 8.8.8.8
Address: 8.8.8.8#53
Aliases: 

a9.g.akamai.net has address 96.17.8.42
a9.g.akamai.net has address 96.17.8.24

.. Eek, using Akamai's servers directly!

- Julian


--- On Fri, 12/31/10, Julian Yap <julian_yap at yahoo.com> wrote:
> From: Julian Yap <julian_yap at yahoo.com>
> Subject: Using a 3rd party DNS providers effects routing from CDN's?
> To: "LUAU" <luau at lists.freesoftwarehawaii.org>
> Date: Friday, December 31, 2010, 1:25 PM
> This is the first I've heard about
> this but apparently using a 3rd party DNS server like Google
> DNS can effect your routing for a CDN like Akamai.
> 
> "CDNs like Akamai, which Apple works with to deliver iTunes
> downloads, use DNS lookup information to locate where users
> are, and then optimize content delivery via the nearest
> available server."
> 
> I guess the an easy test would be:
> a) Inspect to find the domain/URL that is looked up on a
> download
> b) Look up the domain using Google DNS and see what it
> reports
> c) Look up the domain using default local DNS like Hawaii's
> RR DNS
> d) Compare
> 
> Hmm, I guess I better switch to Hawaii RR DNS :(.
> 
> 
> http://www.appleinsider.com/articles/10/12/20/apple_tv_itunes_downloads_slowed_by_google_dns.html
> 
>