AWS Direct Connect: What It Is & How It Works

AWS Direct Connect is a cloud service that establishes a dedicated, private network connection from your on-premises data center or office directly to AWS, bypassing the public internet. You get lower latency, more consistent bandwidth, and a more secure connection for your critical workloads. This article explains how Direct Connect works, its components, costs, and how it compares to other connectivity options.

What Is AWS Direct Connect?

AWS Direct Connect is a network service that lets you establish a dedicated, private connection between your on-premises network and AWS. Instead of routing your traffic over the public internet, you connect through a private, dedicated line. This connection is made via a cross-connect at an AWS Direct Connect location (a colocation facility) or through a partner (like a telecom provider) that offers hosted connections.

The primary benefit is that your data travels over a private network, which reduces the chance of latency spikes, packet loss, and security risks associated with the public internet. It is often used for hybrid cloud architectures, large data transfers, real-time data streaming, and applications that require consistent network performance.

How Does AWS Direct Connect Work?

Direct Connect works by creating a physical or logical connection between your router and an AWS Direct Connect router. Here are the key components:

Direct Connect Location: A facility where you can connect your network to AWS. These are colocation data centers where AWS has a presence.
Cross-Connect: A physical cable that connects your network equipment to AWS’s equipment at the Direct Connect location.
Virtual Interface (VIF): A logical interface that runs over the physical connection. There are two types: private VIF (for connecting to your VPC via a Virtual Private Gateway) and public VIF (for connecting to AWS public services like S3, DynamoDB, or EC2 in a region).
Virtual Private Gateway (VGW): The AWS side of a VPN connection that attaches to your VPC. A private VIF terminates on this gateway.

The process typically involves: ordering a connection from AWS, working with a colocation provider or partner to establish the physical link, creating a virtual interface in the AWS console, and then configuring your on-premises router to establish BGP (Border Gateway Protocol) sessions.

Direct Connect vs. Internet vs. VPN

Many people wonder how Direct Connect compares to a standard internet connection or a VPN over the internet. Here’s a breakdown:

Internet: Traffic is routed over the public internet, which can be subject to congestion, variable latency, and security risks. It’s fine for many workloads but not for those requiring consistent performance.
VPN over Internet: A VPN adds encryption and tunneling over the public internet. It’s more secure than plain internet but still shares the public network, so performance can fluctuate.
AWS Direct Connect: Provides a dedicated, private connection. It offers lower and more consistent latency, higher bandwidth (up to 100 Gbps per connection), and a more secure path because traffic never touches the public internet.

However, Direct Connect is more expensive and requires physical infrastructure. A VPN might be sufficient for occasional or low-volume traffic.

Key Features and Benefits

Direct Connect offers several advantages that make it an attractive option for enterprises:

Consistent Performance: Because the connection is dedicated, you avoid the variability of the public internet. This is crucial for real-time applications like voice, video, and financial trading.
Lower Latency: Direct Connect can reduce latency by 10-20% compared to internet-based connections, depending on your location and routing.
Cost Savings for High Data Transfer: If you transfer large volumes of data, Direct Connect can be cheaper than paying for internet data transfer egress charges. AWS offers discounted data transfer rates for Direct Connect.
Security: Your data does not traverse the public internet, reducing exposure to DDoS attacks and other threats. You can also use AWS PrivateLink to access services over a private IP.
Hybrid Cloud Enablement: It’s a cornerstone for hybrid architectures where on-premises systems need to communicate with AWS resources seamlessly.

Common Use Cases

Direct Connect is not for everyone, but it shines in specific scenarios:

Large Data Migration: Moving terabytes or petabytes of data to AWS is faster and more reliable over a dedicated connection than over the internet.
Real-Time Data Streaming: Applications like IoT, financial feeds, or video streaming require low, consistent latency.
Hybrid IT: Connecting on-premises data centers to VPCs for a unified infrastructure.
Disaster Recovery: Replicating data to AWS for backup and failover, where network reliability is critical.
Compliance: Some regulations require a private, auditable network path for sensitive data.

Costs and Pricing

Direct Connect pricing is not a single flat rate. You pay for the following:

Port Hours: You are charged per hour for each Direct Connect port (1 Gbps or 10 Gbps, or 100 Gbps at select locations). The price varies by region and port speed.
Data Transfer: You pay for data transferred out of AWS over the Direct Connect connection. However, the rates are lower than standard internet egress rates. Data transferred into AWS is free.
Partner/Hosted Connections: If you use a Direct Connect Partner (like a telecom), they may charge a monthly fee for the hosted connection, in addition to AWS port fees.

There is no upfront cost for the AWS side, but you’ll need to pay for the physical cross-connect and any cabling at the colocation facility. The total cost can range from a few hundred to several thousand dollars per month, depending on port speed and data transfer volume.

Common Problems and Troubleshooting

Setting up and maintaining Direct Connect can have its challenges. Here are common issues and how to address them:

BGP Not Establishing: Check that you have the correct VLAN ID, BGP ASN, and IP addresses. Also ensure your on-premises router is configured to allow the BGP session.
High Latency: If latency is higher than expected, check the physical path. You might be connecting to a Direct Connect location far from your AWS region, or your provider is routing suboptimally.
Connection Down: Physical issues like a disconnected cable or a failed port at the colocation facility can cause downtime. Always have a redundant connection (e.g., two Direct Connect connections or a VPN backup).
Bandwidth Not as Expected: Ensure your virtual interface is configured with the correct bandwidth and that your on-premises router isn’t throttling traffic.

Frequently Asked Questions

Is AWS Direct Connect worth the cost?

It depends on your workload. If you have high data transfer volumes, need consistent low latency, or have compliance requirements, Direct Connect can save money and improve performance. For small or occasional workloads, a VPN over the internet may be sufficient and much cheaper.

Can I use Direct Connect to access all AWS services?

Yes, but with a nuance. A public VIF allows access to all AWS public services (S3, DynamoDB, EC2, etc.) in a region. A private VIF only allows access to your VPC(s). You can also use AWS PrivateLink to access specific services privately.

What is the difference between a hosted and dedicated connection?

A dedicated connection is a physical port at an AWS Direct Connect location that you own exclusively. A hosted connection is a logical connection provided by a Direct Connect Partner, where you share the physical infrastructure. Hosted connections are easier to set up but may have variable performance and are subject to partner availability.

How fast is AWS Direct Connect?

Dedicated connections are available in 1 Gbps, 10 Gbps, and 100 Gbps speeds. Hosted connections can be provisioned in increments (e.g., 50 Mbps, 500 Mbps, 1 Gbps) depending on the partner. You can also aggregate multiple connections for higher throughput.

Do I need a Direct Connect location near me?

Yes, you need to be physically close to a Direct Connect location or have a partner that can extend the connection to your premises. The farther the distance, the higher the latency and cost for the cross-connect.

Can I use Direct Connect as a backup for my internet connection?

Yes, many organizations use Direct Connect as a primary connection and an internet-based VPN as a backup, or vice versa. This provides redundancy in case one path fails.

Alternatives to AWS Direct Connect

If Direct Connect seems too costly or complex, consider these alternatives:

AWS Site-to-Site VPN: A secure, encrypted connection over the internet. It’s easier to set up and cheaper, but performance is not guaranteed.
AWS Client VPN: For individual users connecting to AWS, not for data center connections.
AWS Transit Gateway: Not a replacement for Direct Connect, but it can be used with Direct Connect to simplify network architecture across multiple VPCs.
Third-Party Network Providers: Some providers offer private connections to AWS without going through Direct Connect, but they still rely on AWS’s infrastructure.

Choosing the right option depends on your performance needs, budget, and operational complexity.

Method: the standard formula for this calculation, rounded as each result states. See how the calculators work or report an error.

More cards in this drawer

The whole Numbers and Powers drawer →