Step-by-step guide to VPC peering

Opcito Technologies
3 min readJun 10, 2024


Step-by-step guide to VPC peering

Have you ever built a cloud application that uses multiple Virtual Private Clouds (VPCs) in AWS? But then a question arises — what if these isolated VPCs need to interact with each other privately, without compromising security? This is where VPC peering comes to the rescue. In this blog, we’ll delve into the world of VPC peering and explore how it establishes a secure, private network connection between your VPCs, acting as a dedicated bridge within the AWS cloud.

What is VPC peering?

VPC Peering in AWS establishes a secure and private network connection between two VPCs, acting as a bridge within the AWS cloud. This allows resources in separate VPCs to communicate directly, eliminating the need for public internet exposure and enabling seamless communication.

Benefits of VPC peering

VPC peering offers several advantages.

  • Enhanced security: By keeping traffic off the public internet, VPC peering minimizes the risk of unauthorized access.
  • Seamless communication: Resources in peered VPCs can interact as if they were on the same network, fostering smooth application functionality.
  • Flexibility: You can establish VPC peering connections between your own VPCs, or even connect to VPCs in other accounts or different AWS regions.

Steps to setup VPC peering

Let’s dive straight into the detailed steps to secure VPC peering in AWS

Task 1: Create custom VPCs

Creating custom VPCs, such as VPC A and VPC B, allows you to define your virtual networks within AWS, establishing secure and isolated environments for your resources. Each VPC is uniquely identified by a specific CIDR block, ensuring avoidance of IP address conflicts with other networks. Additionally, by including public subnets within VPCs, the foundation is set for hosting resources that require direct internet access, thus enhancing the overall versatility of each VPC. The separation of VPCs, illustrated by VPC B mirroring VPC A’s structure, is crucial for maintaining distinct workloads or applications within the AWS environment. This design allows for the independent hosting of multiple applications, showcasing the flexibility offered by AWS VPCs.

Step 1. Create First Custom VPC (VPC A) (custom-vpc-01)

To start, let’s create the first custom VPC:

Create first custom VPC

Next, create a public subnet for custom-vpc-01:

Create a public subnet for custom-vpc-01

Step 2. Create Second Custom VPC (VPC B) (custom-vpc-02)

Now, let’s create the second custom VPC with the following parameters:
(



Opcito Technologies

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