Step-by-Step Guide

Step 1:  Create VPC Peering Connection

1. Go to: AWS Console → VPC Dashboard → Peering 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.

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