> For the complete documentation index, see [llms.txt](https://karansingh.gitbook.io/aws-saa-c02/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://karansingh.gitbook.io/aws-saa-c02/virtual-private-cloud-vpc/aws-classiclink.md).

# AWS ClassicLink

* ClassicLink allows you to **link EC2-Classic instances to a VPC in your account, within the same Region**.<br>
* If you associate the VPC security groups with a EC2-Classic instance, this enables communication between your EC2-Classic instance and instances in your VPC using private IPv4 addresses.&#x20;