如何在 AWS 中 ping 在同一 vpc 同一子网但不同安全组中运行的 EC2 实例

Question

如何从运行在同一 VPC、同一子网但 AWS 中的不同安全组的实例 B ping EC2 实例 A，两者都在公共子网上运行，如果我添加VPC 的 CIDR 阻塞范围，但不是公共 IP，我想访问公共 IP

Answer 1

Based on the comments.

The issue was caused by blocking 0.0.0.0/0 on instance B. The solution was to add a rule to the B's security group allowing traffic from its public IP.

In case of internet traffic, rules cannot reference each other by security groups. The SG to SG traffic is only for private IP addresses.