An overview of Virtual Private Cloud (VPC) peering explains how it connects two VPCs using private IP addresses within a single cloud provider, avoiding public internet exposure. It covers benefits (security, cost savings, performance), limitations (non-transitivity, manual configuration), a step-by-step AWS setup guide, best practices, common issues, and comparisons with AWS Transit Gateway, PrivateLink, VPC sharing, and VPNs. Terraform is mentioned as a way to automate peering setup.
Table of contents
Benefits of VPC peeringUnderstand the limitationsImplement VPC peering: A step-by-step overviewBest practices for effective VPC peeringCommon issues and solutionsCompare VPC peering with other networking solutionsIntegration and automationUnderstand VPC peering in contextQuestions this post answers
What is VPC peering and how does it work between two AWS VPCs?
VPC peering is a networking method that connects two Virtual Private Clouds so they can communicate using private IP addresses instead of the public internet. It works only within a single cloud provider, so an AWS VPC can peer only with another AWS VPC, not with an Azure or GCP VPC. It improves security, reduces data transfer costs, and improves latency by using the provider's network backbone. Teams designing multi-VPC network architectures can track cloud networking guides like this on daily.dev.
Why can't VPC A communicate with VPC C through VPC B in a peering setup?
VPC peering connections are non-transitive, meaning only directly peered VPCs can communicate with each other. If VPC A is peered with VPC B, and VPC B is peered with VPC C, traffic cannot flow from A to C through B unless A and C are also directly peered with one another. Alternatives like AWS Transit Gateway address this limitation for multi-VPC connectivity needs. Engineers troubleshooting multi-VPC connectivity issues can find networking explainers like this via daily.dev.
When should I use AWS Transit Gateway instead of VPC peering?
AWS Transit Gateway should be used instead of VPC peering when connecting multiple VPCs in complex topologies, since Transit Gateway simplifies many-to-many connections while VPC peering suits simple, direct one-to-one connections. PrivateLink is a separate option for private service connections across VPCs without exposing traffic to the public internet. Architects comparing AWS networking options can weigh tradeoffs like these through daily.dev.
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