VPC Peering

• A VPC peering connection is a networking connection between two VPCs that enables you to route traffic between them using private IPv4 addresses or IPv6 addresses.

• Instances in either VPC can communicate with each other as if they are within the same network.

• You can create a VPC peering connection between your own VPCs, or with a VPC in another AWS account.

• The VPCs can be in different regions (also known as an inter-region VPC peering connection).

• You cannot create a VPC peering connection between VPCs with matching or overlapping IPv4 CIDR blocks.

• For the example below, there is no VPC peering connection between VPC B and VPC C.

  • You cannot route packets directly from VPC B to VPC C through VPC A.

  • To route packets directly between VPC B and VPC C, you can create a separate VPC peering connection between them (provided they do not have overlapping CIDR blocks).