[43365] in North American Network Operators' Group
RE: dns based loadbalancing/failover
daemon@ATHENA.MIT.EDU (Vivien M.)
Sun Oct 7 01:16:18 2001
From: "Vivien M." <vivienm@dyndns.org>
To: <Valdis.Kletnieks@vt.edu>, "'Mary Grace'" <nanog@diskserv.com>
Cc: <nanog@merit.edu>
Date: Sun, 7 Oct 2001 01:14:24 -0400
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> -----Original Message-----
> From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu] On
> Behalf Of Valdis.Kletnieks@vt.edu
> Sent: October 7, 2001 1:05 AM
> To: Mary Grace
> Cc: nanog@merit.edu
> Subject: Re: dns based loadbalancing/failover
>
>
>
> On Sat, 06 Oct 2001 16:44:57 EDT, Mary Grace said:
> > Hrmm, no, that is called "Akamai", isn't it? :)
>
> There's an Akamai across the hall from my office, and the way
> it was explained to *me* was that the DNS always returns the
> same IP address for a given Akamai'zed page (so the URLs in
> the HTML are consistent), but routing games are used to
> direct the packets to the appropriate server. In other
> words, it's one IP that points to disparate machines.
They lied to you (I don't remember who a96.g.akamai is; it's some
well-known Akamai customer, maybe CNN):
vivienm@quartz:~$ nslookup a96.g.akamai.net
Server: quartz.bos.dyndns.org
Address: 66.37.218.198
Non-authoritative answer:
Name: a96.g.akamai.net
Addresses: 216.32.119.10, 216.32.119.74
vivienm@quartz:~$ nslookup a96.g.akamai.net amethyst.ith.dyndns.org
Server: amethyst.ith.dyndns.org
Address: 216.7.11.130
Non-authoritative answer:
Name: a96.g.akamai.net
Addresses: 207.127.111.70, 207.127.111.73
vivienm@nickel:~$ nslookup a96.g.akamai.net
Server: zinc.fmt.dyndns.org
Address: 64.71.191.27
Non-authoritative answer:
Name: a96.g.akamai.net
Addresses: 64.21.49.15, 64.21.49.36
vivienm@lapis:~$ nslookup a96.g.akamai.net
Server: 212.100.224.10
Address: 212.100.224.10#53
Name: a96.g.akamai.net
Address: 64.124.157.126
Name: a96.g.akamai.net
Address: 64.124.157.91
[from my home box]
vivienm@deep:~$ nslookup a96.g.akamai.net
Server: proxy1.slnt1.on.wave.home.com
Address: 24.112.33.4
Name: a96.g.akamai.net
Addresses: 65.163.234.8, 65.163.234.24
[from one of your DNS servers]
vivienm@quartz:~$ nslookup a96.g.akamai.net milo.cns.vt.edu
Server: milo.cns.vt.edu
Address: 198.82.247.98
Name: a96.g.akamai.net
Addresses: 198.82.164.48, 198.82.164.40
I'm sure I could keep going if you really wanted, but I think that's
enough to prove the point...
Vivien
--
Vivien M.
vivienm@dyndns.org
Assistant System Administrator
Dynamic DNS Network Services
http://www.dyndns.org/
