A company has hundreds of Amazon EC2 instances that are running in two production VPCs across all Availability Zones in the us-east-1 Region. The production VPCs are named
VPC A and VPC B.
A new security regulation requires all traffic between production VPCs to be inspected before the traffic is routed to its final destination. The company deploys a new shared VPC that
contains a stateful firewall appliance and a transit gateway with a VPC attachment across all VPCs to route traffic between VPC A and VPC B through the firewall appliance for
inspection. During testing, the company notices that the transit gateway is dropping the traffic whenever the traffic is between two Availability Zones.
What should a network engineer do to fix this issue with the LEAST management overhead?
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