Gets and sets whether the default security group for the VPC should be configured to allow traffic from the EC2 instances to the NAT instance.
This means another security group with the name "NATGroup" will be created and a new permission allowing all inbound traffic will be added to the default security group for the VPC.
If this VPC is going to be used for AWS Elastic Beanstalk deployments then used this security group as the security group specified for the environment.

C# |
public bool ConfigureDefaultVPCGroupForNAT { get; set; }