AWS NAT Instance
AWS NAT Instance is a managed network address translation (NAT) service provided by Amazon Web Services that allows private instances in a Virtual Private Cloud (VPC) to access the internet or other AWS services while preventing inbound connections from the internet. It acts as a gateway for outbound traffic, translating private IP addresses to a public IP address, and is typically deployed in a public subnet. This service is part of AWS's networking infrastructure, enabling secure and controlled internet access for resources in private subnets.
Developers should use AWS NAT Instance when they need to provide internet access to private instances in a VPC for tasks like software updates, external API calls, or downloading packages, while maintaining security by keeping those instances isolated from direct internet exposure. It is particularly useful in scenarios where fine-grained control over NAT configuration is required, such as custom routing or integration with specific security groups, though AWS now recommends NAT Gateway for most use cases due to its managed nature and higher availability.