I'm just wondering if anyone setup a DMZ on Transit firewalls in Transit VPC on AWS? Basically we need to have outbound to inbound NAT rule with a elastic ip address. Came across this link but not sure if this is the proper way of doing it. We would like achieve this through a dedicated VSYS but open for different options.
We would typically recommend a different set of firewalls for inbound traffic outside of the Transit Firewalls. They would then either sit in the VPC with the application or connected to the VPCs via a peering link. This is to alleviate the fact that Transit VPC firewalls are active/passive in terms of routing load and an inbound design is active/active resulting in a possible overloaded firewall.
Knowing that this is not always feasible. You can use a public-facing ALB/NLB in front of the firewalls and then SNAT to address that has been distributed via BGP to the spokes. This would either be one of the Ethernet addresses or a loopback. Do not SNAT to the tunnel address as they are not fault-tolerant on a tunnel failure.
@jmeurer On the page 12 of the aws-transit-vpc-model-deployment-guide there is a way to create an inbound NAT on Transit firewalls. My question is how can you ensure that same elastic ip address is failed over to the other firewall just in case if it looses connectivity the subscriber VPC which is being used for destination NAT. We would like to leverage our existing Transit VPC setup to see if it fulfills our needs.
The design on page 12 of that guide utilizes a separate set of firewalls in the spoke VPC that are dedicated to the inbound traffic for only that spoke VPC. This design is different than bringing inbound traffic in through the Transit VPC. In either scenario, the EIP/FQDN is assigned to the public-facing load balancer, it is not released if a link is down. The design you are looking for is not in that guide. It would be best communicated through your Systems Engineer.
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