VPC peering
When operating a large application that spreads across VPCs or regions, we sometimes have a requirement to connect that application via a private connection. We always have the option to create VPN connections between VPCs, but that will require us to maintain the configuration of the VPN devices and ensure the security of those.
A simpler way to connect VPCs together is through VPC peering. A VPC peering connection is a networking connection between two VPCs that allows you to route traffic between them privately and have the ability to connect instances in private subnets within separate VPCs to communicate directly, as demonstrated in the following diagram:
AWS provides the ability to create VPC peering connections between ...
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