Internet Gateway (IG)

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.