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Private Connections in Cloud Computing

Learn about Private Connections in this comprehensive Cloud Computing tutorial. VPC peering concepts.

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1Cost Savings

Using Gateway Endpoints for S3 prevents traffic from crossing NAT Gateways, eliminating massive data processing fees.

2Step-by-Step Breakdown

VPC Peering. Connects two VPCs securely via the AWS private backbone.

No Overlapping CIDRs. Peering requires non-overlapping CIDR blocks.

Not Transitive. If A peers with B, and B peers with C, A is NOT peered with C. You must explicitly peer A with C.

Route Updates. After accepting a peering connection, you MUST update route tables in both VPCs.

Knowledge Check. Is VPC Peering transitive?

→Yes
→No

VPC Endpoints. Allows private subnets to access AWS services (like S3) without a NAT Gateway.

Gateway Endpoints. Used exclusively for Amazon S3 and DynamoDB. Modifies your route table.

Interface Endpoints. Uses AWS PrivateLink. Injects an Elastic Network Interface (ENI) with a private IP into your subnet.

Security. Endpoints keep traffic entirely off the public internet, satisfying compliance requirements.

Summary. Peering for VPCs, Endpoints for AWS APIs.

Pascual Vila

Frontend Instructor // Code Syllabus

Common Pitfalls & Errors

The Error //

Forgetting that VPC Peering isn't transitive

// A <-> B peered, B <-> C peered
// A CANNOT reach C — peering does not transit through B

The Solution //

If VPC A is peered with VPC B, and VPC B is peered with VPC C, A cannot reach C through B — each peering connection only covers the two VPCs directly involved. For a hub-and-spoke topology connecting many VPCs, use a Transit Gateway instead of chaining peering connections.

The Error //

Using a NAT Gateway to reach AWS services like S3 or DynamoDB instead of a VPC Endpoint

aws ec2 create-vpc-endpoint --vpc-id vpc-123 --service-name com.amazonaws.us-east-1.s3 \
  --route-table-ids rtb-123 --vpc-endpoint-type Gateway

The Solution //

Routing traffic to AWS services through a NAT Gateway sends it out over the internet path and incurs NAT data processing charges. A Gateway Endpoint (free, for S3/DynamoDB) or Interface Endpoint keeps that traffic entirely on the AWS private network and is typically cheaper and faster.