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 Dashboard → Peering Connections → Click “Create Peering Connection”.

2. 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.

3. 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 Tables

You must allow traffic between VPCs by updating their route tables.

1. Go to VPC → Route Tables.

2. 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)

1. Go to EC2 → Security Groups.

2. 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.

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