Sage-Tips

Can a VPC have multiple subnets?

Dual-stack (IPv4 and IPv6): Your VPC is associated with an IPv4 CIDR or both IPv4 and IPv6 CIDRs. As a result, any subnets you create in the VPC can be dual-stack subnets. Any EC2 instances launched within the subnet will communicate over the IP of the subnet.

Where does the NAT gateway reside in private and public subnet?

Now, a NAT gateway sits within the public subnet. Because it sits within the public subnet, it has to have a public IP address in the form of an EIP which is an Elastic IP address, and this is assigned to the instance itself.

How do I connect a public facing load balancer to EC2 instances that have private IP addresses?

To attach Amazon EC2 instances located in a private subnet, create public subnets in the same Availability Zones as the private subnets used by the backend instances. Then, associate the public subnets with your load balancer.

How do I associate a NAT gateway to a private subnet?

To create a NAT gateway, you must specify a subnet and an Elastic IP address….Configure NAT Gateway for private subnets in your VPC:

1. Navigate to the AWS console -> Services.
2. Go to the Networking & Content Delivery section and click VPC.
3. Navigate to Virtual Private Cloud -> NAT Gateways -> Create NAT Gateway.

How do I create a private subnet for my VPC?

For greater availability, you should create at least one more of each subnet type in a different Availability Zone so that your VPC has both public and private subnets across two Availability Zones. In the left navigation pane, choose Subnets . Choose Create Subnet . For Name tag, enter a name for your subnet, such as Private subnet .

Can instances in the private subnet connect to the Internet?

Instances in the private subnet can use an egress-only internet gateway to connect to the internet over IPv6, but the internet cannot establish connections to the private instances over IPv6. For more information about IPv4 and IPv6 addressing, see IP Addressing in your VPC .

How do I assign a public IPv4 address to an instance?

Instances launched in the public subnet must be assigned a public IPv4 address to communicate with the Amazon ECS service endpoint. In the left navigation pane, choose Subnets . Select the public subnet for your VPC.

What is the difference between private and public IPv4 addresses?

Instances with private IPv4 addresses in the subnet range (examples: 10.0.0.5, 10.0.1.5). This enables them to communicate with each other and other instances in the VPC. Instances in the public subnet with Elastic IPv4 addresses (example: 198.51.100.1), which are public IPv4 addresses that enable them to be reached from the internet.