If you need a generic replacement for NAT Gateway you can build one using Transit Gateway and a pair of router VMs running GRE+BGP. Amazon has most of an examp

If you need a generic replacement for NAT Gateway you can build one using Transit Gateway and a pair of router VMs running GRE+BGP. Amazon has most of an example here using quagga (but CloudFormation, ick): https://github.com/aws-samples/aws-transit-gateway-connect-sample https://github.com/aws-samples/aws-transit-gateway-connect-s...