Intro to VPC Peering

AWS VPC Peering is a service provided by Amazon Web Services (AWS) that allows customers to create peering connections between their Virtual Private Clouds (VPCs). It enables direct communication between VPCs in the same AWS account or in different AWS accounts within the same region.

Network peering is a networking arrangement that allows two separate networks to communicate directly with each other, as if they were part of the same network. It establishes a direct connection between the networks, bypassing the need for traffic to traverse through public networks or the internet.

AWS VPC Peering is a service that allows customers to establish private network connections between Virtual Private Clouds (VPCs) within the same AWS account or across different AWS accounts. It enables direct communication between VPCs, allowing resources within these VPCs to interact as if they were on the same network.


How AWS VPC Peering Works
  • VPC peering is based on a bilateral relationship between two VPCs. One VPC acts as the requester (the VPC initiating the peering connection), while the other VPC acts as the accepter (the VPC accepting the peering connection).
  • The two VPCs must have non-overlapping IP address ranges and should not have overlapping or conflicting route tables.
  • Once the peering connection is established and accepted by both VPCs, communication between instances in the peered VPCs can occur using private IP addresses.
Key Benefits of AWS VPC Peering
  1. Simplified Networking: VPC peering allows for a simplified networking architecture by establishing direct connectivity between VPCs. This eliminates the need for complex VPN configurations or transit gateways.
  2. Low Latency and High Throughput: VPC peering enables fast and efficient communication between instances in peered VPCs, resulting in low-latency and high-throughput data transfer.
  3. Shared Resources and Collaboration: VPC peering facilitates sharing of resources, such as AWS services, across VPCs. This promotes collaboration and efficient resource utilization.
  4. Private and Secure Communication: VPC peering allows for private and secure communication between instances, as traffic remains within the AWS network and does not traverse the public internet.
  5. Granular Control: VPC peering provides granular control over network traffic between peered VPCs. You can define and enforce network policies, security groups, and access controls to govern traffic flow.
  6. Cost-Effective: Using VPC peering reduces costs associated with data transfer because traffic between peered VPCs stays within the AWS network and doesn’t incur additional data transfer fees.
When to Use AWS VPC Peering
  • Multi-Region Connectivity: VPC peering can be used to establish connectivity between VPCs in different AWS regions, allowing for distributed architectures and disaster recovery scenarios.
  • Shared Resources: When resources, such as databases or shared services, need to be accessed by instances in different VPCs, VPC peering enables efficient sharing without exposing them to the public internet.
  • Inter-VPC Communication: If you have multiple VPCs that need to communicate with each other for various purposes, such as microservices architecture or data replication, VPC peering provides a secure and efficient solution.
When Not to Use AWS VPC Peering
  • Overlapping IP Ranges: VPC peering cannot be established between VPCs with overlapping IP address ranges. It is essential to ensure that the IP ranges of the VPCs do not conflict.
  • Transitive Peering: VPC peering does not support transitive peering, meaning you cannot use peering connections to establish connections between VPCs indirectly. In such cases, AWS Transit Gateway might be more suitable.
  • Internet Access Requirements: If you need instances in a VPC to access the internet through an internet gateway, using VPC peering alone is not sufficient. You would need additional configurations like NAT gateways or AWS Transit Gateway.

In summary, AWS VPC Peering provides a straightforward and secure way to establish private network connections between VPCs. It offers benefits such as simplified networking, low latency, resource sharing, private communication, granular


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