VPC Peering Essentials:

  • VPC peering is used to extend your private network from one VPC, or one subnet, or specifically one instance, to another VPC.
  • This is for sharing internal resources, via private IP addresses.
  • VPC peering can only occur between two VPCs that are in the same region.
  • You cannot configure VPC peering between VPCs in two different regions.
  • You can however configure VPC peering between VPCs in different accounts - but only if they are in the same region.
  • To peer VPCs, they must have separate (non-overlapping) CIDR block ranges.
  • Transitive connections are not allowed.
  • You can configure the peering to connect the entire VPC, or just specific subnets.

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