VPC Peering

VPC peering is a networking connection between two Virtual Private Clouds that enables instances in either VPC to communicate using private IP addresses as if they were in the same network. Security considerations include that peered VPCs share network access but not security groups — separate security group rules and NACLs must be configured in each VPC.

VPC peering does not support transitive routing, limiting blast radius but also requiring explicit peering for every VPC pair that needs communication.