Does the ELB's IP Ever Change once setup, or will it always access instances from the same location during its lifetime no matter what might be going on with it behind the scenes at Amazon?
From stackoverflow
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ELB's IP address keeps changing. You should instead use the DNS name provided to you.
http://developer.amazonwebservices.com/connect/thread.jspa?threadID=32280
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The short answer: Yes, ELB's IP addresses (both the ones that are publicly distributed to clients of your service, and the internal IPs from which ELB sends traffic to your instances) dynamically change.
The long answer: See my article about how ELB works for more info: http://shlomoswidler.com/2009/07/elastic-in-elastic-load-balancing-elb.html
coderchris : Nice Article Shlomo but I'm making the forum thread my preferred answer on this one as it deals with many people's experiences directly.
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