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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?
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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.
Application Load Balancer now enables AWS PrivateLink and static IP addresses by direct integration with Network Load Balancer.
An Elastic IP address is a static public IPv4 address associated with your AWS account in a specific Region. Unlike an auto-assigned public IP address, an Elastic IP address is preserved after you stop and start your instance in a virtual private cloud (VPC).
Answer. Once an EC2 instance is launched, it's assigned a private IP address at boot time. An instance's private IP address will never change during the lifetime of that instance.
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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