What is Amazon VPC

Amazon VPC is the networking layer for Amazon EC2. If you’re new to Amazon EC2

Amazon Virtual Private Cloud (Amazon VPC) enables you to launch AWS resources into a virtual network that you’ve defined. This virtual network closely resembles a traditional network that you’d operate in your own data center, with the benefits of using the scalable infrastructure of AWS.

VPCs and Subnets

virtual private cloud (VPC) is a virtual network dedicated to your AWS account. It is logically isolated from other virtual networks in the AWS Cloud. You can launch your AWS resources, such as Amazon EC2 instances, into your VPC. You can specify an IP address range for the VPC, add subnets, associate security groups, and configure route tables.

To protect the AWS resources in each subnet, you can use multiple layers of security, including security groups and network access control lists (ACL).

subnet is a range of IP addresses in your VPC. You can launch AWS resources into a specified subnet. Use a public subnet for resources that must be connected to the internet, and a private subnet for resources that won’t be connected to the internet.

The original release of Amazon EC2 supported a single, flat network that’s shared with other customers called the EC2-Classic platform. Earlier AWS accounts still support this platform, and can launch instances into either EC2-Classic or a VPC. Accounts created after 2013-12-04 support EC2-VPC only.

By launching your instances into a VPC instead of EC2-Classic, you gain the ability to:

  • Assign static private IPv4 addresses to your instances that persist across starts and stops
  • Optionally associate an IPv6 CIDR block to your VPC and assign IPv6 addresses to your instances
  • Control the outbound traffic from your instances (egress filtering) in addition to controlling the inbound traffic to them (ingress filtering)
  • Assign multiple IP addresses to your instances
  • Define network interfaces, and attach one or more network interfaces to your instances
  • Change security group membership for your instances while they’re running
  • Add an additional layer of access control to your instances in the form of network access control lists (ACL)
  • Run your instances on single-tenant hardware

Accessing the Internet

You control how the instances that you launch into a VPC access resources outside the VPC.

Your default VPC includes an internet gateway, and each default subnet is a public subnet. Each instance that you launch into a default subnet has a private IPv4 address and a public IPv4 address. These instances can communicate with the internet through the internet gateway. An internet gateway enables your instances to connect to the internet through the Amazon EC2 network edge.

By default, each instance that you launch into a non default subnet has a private IPv4 address, but no public IPv4 address, unless you specifically assign one at launch, or you modify the subnet’s public IP address attribute. These instances can communicate with each other, but can’t access the internet.

Author: Aditya Bhuyan

I am an IT Professional with close to two decades of experience. I mostly work in open source application development and cloud technologies. I have expertise in Java, Spring and Cloud Foundry.

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