We [1] just went through a process to remove public ipv4 IPs for some of our internal facing EC2 instances. Just in case some people are on the same boat. Here

We [1] just went through a process to remove public ipv4 IPs for some of our internal facing EC2 instances. Just in case some people are on the same boat. Here's a simple process [2] to remove public ipv4 IPs from existing EC2 instances (no need to shutdown / reboot) - 1) Create a new elastic ip with autoassigned ipv4 IP - https://us-west-1.console.aws.amazon.com/ec2/home?region=us-west-1#Addresses https://us-west-1.console.aws.amazon.com/ec2/home?region=us-...: 2) Associate this new elastic ip to an existing EC2 instance. This will replace existing public ipv4 ip of this instance. 3) Create a new network interface - https://us-west-1.console.aws.amazon.com/ec2/home?region=us-west-1#NIC https://us-west-1.console.aws.amazon.com/ec2/home?region=us-...: 4) Attach this new network interface to the EC2 instance. Now the EC2 instance has two network interfaces, thus two private ipv4 IPs. 5) Disassociate the new elastic ip & release the ip - https://us-west-1.console.aws.amazon.com/ec2/home?region=us-west-1#Addresses https://us-west-1.console.aws.amazon.com/ec2/home?region=us-...: By this point, the EC2 instance doesn't have a public ipv4 ip anymore. --- [1] https://www.listennotes.com/ https://www.listennotes.com/ [2] https://stackoverflow.com/questions/38533725/can-i-remove-the-public-ip-on-my-instance-without-terminating-it https://stackoverflow.com/questions/38533725/can-i-remove-th...