What DNS Is Not

Jack Bates jbates at brightok.net
Mon Nov 9 09:28:21 CST 2009


Alex Balashov wrote:
> Thought-provoking article by Paul Vixie:
> 
> http://queue.acm.org/detail.cfm?id=1647302
> 

Bah, many of the CDN's I've dealt with don't seed geographical responses 
based on DNS, but rather use many out of band methods for determining 
what response they will hand out. The primary reason for short cutting 
cache is to limit failures in case the system a requestor is going to 
goes down.

And different CDN's behave differently, depending on how they deliver 
content, support provider interconnects, etc. I'd hardly call many of 
them DNS lies, as they do resolve you to the appropriate IP, and if that 
IP disappears, try and quickly get you to another appropriate IP.

The rest of the article was informative,though.


Jack





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