RE: [SQU] deakamiser

-----Original Message-----
From: Robert Collins [mailto:robert.collins@itdomain.com.au]
Sent: Thursday, December 07, 2000 1:37 AM
To: mmay@akamai.com; 'Squid-Users (E-mail)'
Subject: Re: [SQU] deakamiser

>I always understood Akamai to distribute the content world wide, so the
>actual server (ie a4.g.akamai.net) would vary, while the
>/7/4/1/0001/ would be constant? Is there anywhere I can find some
>_detail_ on this? I will go through my logs in more detail...

The a4.g.akamai.net is a virtual server that is mapped to an IP based on the
origin of the request and current traffic and load conditions on our
network. This mapping is twofold: a DNS lookup for g.akamai.net from our
central high-level name servers points you (TTL 20 min.) to low-level name
servers in a region optimal to serve your request. The low-level name
servers return two IPs (TTL 3 min.) with enough bandwidth and CPU to serve
the request optimally.

The rest of the ARL is metadata consisting of 4 fields: caching typecode,
virtual server number, customer code, identifier (assorted possibilities
based on typecode: MD5, version string, TTL etc.).

To repeat: the ARLs are static, the DNS resolution is highly dynamic ...

Michael

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