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I have a Windows instance (m1.medium) running in a VPC in AWS with one Network Interface (eth0).

I am trying to see if there is a way (or a workaround?) to migrate the private IP (IE: 10.80.78.0/24 subnet)from this instance to another instance?

I know with Elastic Network Interfaces (eth1) you can hotswap the ENI as needed between different nodes.

I have a bad feeling that this instance will need to be terminated, to allow us to migrate the IP to another node.

Before doing so though, I was wondering if anyone has ever dealt with this before-and maybe has a solution? Right now all services for a particular application are pointing to the above Private IP, so launching a new instance in the same subnet and updating our code to reflect the new IP (in Production) would be to hasty (at this juncture)..

Thanks in advance!

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There's apparently no consolation, here.

Only secondary IP addresses can be moved around without terminating the instance.

Unlike a primary private IP address, you can reassign a secondary private IP address from one network interface to another and from one instance to another.

— http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/vpc-ip-addressing.html

The Network Interfaces option in the console will also greet you with a greyed-out "detach" button for primary interfaces.

You can detach secondary (ethN) network interfaces when the instance is running or stopped. However, you can't detach the primary (eth0) interface.

— http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-eni.html#detach_eni

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