Fermin Perdomo

Senior Full Stack Engineer | PHP | JavaScript

How create peering connection to connect two VPCs in AWS

Fermin Perdomo
June 24, 2025

Sometimes you need to connect two VPCs in AWS. In this article, I will explain how to implement that in four simple steps.

Step-by-Step Guide

Step 1:  Create VPC Peering Connection

  1. Go to: AWS Console → VPC DashboardPeering Connections → Click “Create Peering Connection”.

Fill in the details:

  • Name tag (optional): e.g., VPC-A-to-VPC-B.
  • VPC Requester:
    • Select the Requester VPC (your current VPC).
  • VPC Accepter:
    • Same account: Choose from dropdown.
    • Another account: Enter Account ID and VPC ID manually.

Click “Create Peering Connection”.

Step 2: Accept the Peering Connection

Same account:

  1. In VPC → Peering Connections, select the new connection.
  2. Click “Actions → Accept Request”.

Different account:

  1. The owner of the Accepter VPC must log into their AWS account.
  2. Navigate to VPC → Peering Connections.
  3. Find the pending request and click “Accept Request”.

Step 3: Update Route TablesYou must allow traffic between VPCs by updating their route tables.

Go to VPC → Route Tables.

For each VPC:

  • Select the relevant Route Table.
  • Click “Routes” → Edit routes → Add route:
    • Destination: The CIDR block of the peer VPC.
    • Target: The Peering Connection ID.
  • Click “Save routes”.

Repeat this for the other VPC’s route table.Step 4: Update Security Groups (Optional but likely needed)
Go to EC2 → Security Groups.
Edit the inbound rules to allow traffic from the CIDR of the peer VPC.
Example:
Type: All traffic (or specific port like HTTP, SSH)
Source: <peer VPC CIDR>
Do this on both sides.

Let me integrate VPCs for you. Get a free quote here.

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