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.

  • The VPCs can be in different regions and different accounts.

  • To send private IPv4 traffic from your instance to an instance in a peer VPC, you must add a route to the route table that's associated with your subnet in which your instance resides.

    • The route points to the CIDR block of the peer VPC in the VPC peering connection, and specifies the VPC peering connection as the target.

Transitive peering

  • Instead of using VPC peering, you can use an AWS Transit Gateway that acts as a network transit hub, to interconnect your VPCs and on-premises networks.

  • You have a VPC peering connection between VPC A and VPC B, and between VPC A and VPC C.

  • There is no VPC peering connection between VPC B and VPC C.

    • So, you cannot route packets directly from VPC B to VPC C through VPC A.

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