You need my fork of terraform and the aws cli tool installed, with a ~/.aws/credentials file with a [demo] section
This repository builds an example VPC with front and back networks + different routing tables and a NAT instance with terraform.
For more information, see my blog post about it.
make
ssh-add id_rsa
cd eucentral1-demo
make
terraform apply
make sshnat
ssh 10.1.1.4