Why do existing connections still work after I associate a new IP address to an instance?
When you remap an Elastic IP to an instance, some of your preexisting communications (to the old and now unmapped IP address) will continue to work even after the remap. For example, if you have an open ssh connection to an instance via its system assigned Public IP address and subsequently associate one of your Elastic IP addresses with that instance, the ssh session might continue to function normally for some time. This behavior is expected but unreliable. We strongly urge you to reestablish connections via the new remapped IP addresses to ensure that your software functions correctly. When you remap an IP address, we propagate the new mapping throughout the EC2 network. Because of the behavior of some network devices, existing communications (defined as established source IP, destination IP, port combinations) might continue to utilize preexisting mappings until the devices refresh their caches. This results in existing connections continuing to work. However, because of the highly
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