-----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/