Configuring security groups within the lab

Now that we have set up two vulnerable servers, the next step is to configure network so that our web application isn't accessible to outsiders and, at the same time, so that the other lab machines can communicate with each other.

Configuring security groups

We had originally set all of the EC2 instances to be on the same VPC. This implied that the EC2 instances would be on the same subnet and would be able communicate with each other through internal IP addresses. However, AWS doesn't want to allow all 4,096 addresses on the same VPC to be communicating with each other. As a result, the default security groups don't allow communication between EC2 instances.

To allow...