inbound outbound 설정 그룹같은 AWS VPC, subnet 의 ec2라도 서로 트래픽 오가려면 inbound 추가해줘야 ICMP 열어주기How To Fix Amazon EC2 Instance Unable to PingIn this video, I will show you guys how to fix Amazon Ec2 Instances Ping not working.✿ How To Configure VPC in AWS Public & Private Subnets | Route Tables | ...https://www.youtube.com/watch?v=rlJXJq6S2ZE