What is Internet Gateway?
- An Internet Gateway (IGW) is a logical connection between an Amazon VPC and the Internet.
- It is not a physical device and Only one can be associated with each VPC.
- When we create IGW, it will not be attached to the VPC automatically, we need to explicitly attach it to the VPC.
- If a VPC does not have an Internet Gateway, then the resources in the VPC cannot be accessed from the Internet.
- It does not limit the bandwidth of Internet connectivity. (The only limitation on bandwidth is the size of the Amazon EC2 instance, and it applies to all traffic — internal to the VPC and out to the Internet.)
- It scales horizontally and is HA and redundant.
- One VPC can only be attached to one IGW and vice versa.
